Cheers mate 👌 With your 2.5hp tohatsu, if it’s a two stroke you can remove the restrictor washer from behind the carburetor and it’s a 3.3hp straight away. Nice and easy 😎😎😎 Thanks again mate, Aussie Boat Guy 😎
Thanks for putting up these tests and videos. I'm trying to work out which 2 stroke to use as an auxiliary outboard to complement my 115HP on my 5.2m centre console and your videos have given me an insight into engine sizes and props.
@@25hpboatracerman I haven't got one yet. Every time I see a a suitable one it's either already sold, or the seller wants twice as much as it's worth, or it's a 1000ks away. I'll give it another go as it's the middle of winter now so there may be more available.
Great videos! You might already know this but the Yamaha 6hp/8hp 2-stroke have almost identical carbs as these. I’ve considered trying one on these on this motor.
The only mod that I can see is to fill in a slot for the fuel pump pulse to the block. The engine your modding has the half round port over to one side, and the Yamaha has a straight to the block port. I have both engines so I might try the mods you have done and add the Yamaha 6 or 8hp carb.
That’s a great vid showing the details, so easy with some of the new small fuel injected four strokes that share a block etc, just buy the new fuel injection model and air intake mod to change from 9.9 to 15 and then change back again. But still not the punch and simplicity (smell) of a two stroke. Keep the vids coming please, love the content.
Interesting stuff. I have done chainsaws and used a timing wheel to get timing of the ports and transfers to where I wanted them. Yeah it's not about just hogging it out as much as possible. You will end up with a 2 stroke with no low down toque. Good video.
Hi mate, Thanks 👍 I really appreciate your comments. Definitely need to be careful when porting and I definitely have a lot more to learn too. cheers 🍻 Aussie Boat Guy 😎
Great mate that 5 goes like a rocket definitely the way to go if u want to get the best out of your motor its a lot involved but awesome. Good explaining buddy good vid as always.
Simply awesome! You give me hope for my 1992 NS5B (non running). Around the 3:55 mark you mention shaving the head... eyeball / feel situation or did you shave an exact amount? Thanks for the videos!
Cheers mate, appreciate your comments. I shaved the head to an exact amount and then re-tuned the pot. You cannot shave the head on the 5 without re-turning the squish band and the pot. I would leave the head and the stock carb, the biggest difference was the porting. Thanks again mate Aussie Boat Guy 😎
Hi mate! Cheers from finland. Did you raise the transfers, and how much? And how much did yo raise the exhaust? I have two similar engines, and planning on doing the same tweaks on one of them.
Hi Mate, Yep, raised the transfers. I cannot remember exactly how much but think it was only about 1mm on the transfers and more like 2mm on the exhaust. Unfortunately I have lost the calculations and port map I did. Cheers 🍻 Aussie Boat Guy.
@25hpboatracerman thanks for the reply. That's about the same I have come up with. Can't be too ambitious or all low end torque is lost. With 10" aluminium self made cleaver, lightly ported 5hp my 10 year old came up to almost 22 knots. Now I'll try to make an engine that would make 25kn 😅
Hi just wondering if the increased compression results in a harder pull start pressure. Love the video and I'm now looking for a 5hp tohatsu for a bit of fun
Hi mate, Yes definitely. Now that the motor is run in the compression is 145psi. It’s still not to bad to pull start. Keep in mind a 25 - 30hp tohatsu two stroke has about 150psi comp and they are still pull start. Cheers Aussie Boat Guy 😎
im a yank, but i have a 58' 18hp evinrude that im thinking about trying to find a larger, more modern carb to swap on. do you by chance have an idea about what carb would be a good idea to look into?
Hi Mate, The 58 Evinrude is a beautiful motor, i don’t know how much more power you can get. You may start with a 25 to 35hp omc carburetor but probably won’t just bolt straight up. Cheers 🍻 Aussie Boat Guy 😎
Hi Aussie Boat Guy! Can you help me please? I have 2003 Tohatsu 5hp, I have replaced crank bearings with top quality sealed bearings, QUESTION" I found a vacuum hose with One Way Valve in it from cylinder to lower case, is this for oil to bearing or pressure for lower crank seal? " As I was going to remove if for lubrication of bearing! And I have done all your mods from porting exhaust, intake and carb grinde from 15mm to 17mm, high compression head work, after market reeds, and rejetting! Thankyou, or anybody! Love all your videos cheers!
Hi mate, I would remove the bearing face plates so that they can be lubricated by the two stroke mix like the factory ones, not sure what probs could occur from having sealed ones?? If it was a good idea, they would be in all the motors from factory. That line is to circulate oil from the bottom of block to the top, leave installed and make sure it goes on the same way as it has a one way valve in it. Hope this helps mate. Cheers 🍻 Aussie Boat Guy 😎
Mate do you do motors up, for people or just your self? I have a 5hp that needs a little bit more go, and thinking what you have done here would work a treat. Looks like you know what works the best for them
How tight of squish can you safely go on a typical 2 stroke outboard when having a head shaved ?? Just not sure what size or make outboards have heads or bling hole cylinders. Love you videos brother. Yours in 2 stroke outboards
Hi Mate, It likely changes with most motors, I tend to shave about 20 though off some of my stock heads as a start. Some the squish is to close to the piston to shave any off without re-turning the squish. on some motors I remove the head gasket, re-bolt the head on gently and check squish with that thickness removed as a start. Cheers 🍻 Aussie Boat Guy
I was just looking at cleaning up the transfer ports if they needed it and skimming the head on mine. How much did you skim off the head or what squish were you aiming for. Thanks.
@@25hpboatracerman Thanks. Sounds like a job I will leave for those with plenty of 2 stroke modifying experience. I presume it only adds a bit of torque anyway.I will smooth out the ports and not enlarge them.Could easily stuff something up there..Great video and info. I might look out for an old motor to be a bit more adventurous on.
Hello, I saw your project with the modified engine and it turned out very well. I own this boat engine and I'm thinking of doing the following, pop-up piston 0.3mm, intake with enlarged exhaust and reaming the cylinder head (spark plug) with 0.2mm. What do you say, is it good?
Hi mate, Sounds ok 👍 Just make sure what you do to the dead adds sone compression, one is at 145psi now and you could probably even go to 155psi. Cheers 🍻 Aussie Boat Guy 😎
15hp question..just bought an older mint kiwi 12' tinny(Ramco) for harbour fishing....has 2006 Merc 15 ..USA.. tiller gear shift..262cc ..has a 9 P blade that paint is pitted and lifted...gonna sand it off and repaint with Wattyl Kill Rust..my fav..epoxy in a can...however...was thinking of putting on an 11P ...just me (112 kg ) and some stuff ... Your thoughts on the 11P..cheers...ooooor...get a 15 super and make it an 18 ?
Hi mate, My mate used to deal Ramco boats in Australia, I liked them 👍 The USA merc 15 is a nice motor and if in good nic they are smooth and quiet too. Firstly I have a few vids on balancing props you might want to check out if your prop is a bit banged up. I am not sure you would spin up an 11p but worth a try for sure. Often for example the 9p will get up on the plane well and top out at say 40kph revving at around 5800rpm and an 11p may be slow up onto the plane, top out at 40kph revving at 5100rpm. Like going up a hill in your car in 3rd or 5th gear. In saying that, I always try different props to find the best performer for each setup. I am currently using a 10p alloy on my 18hp 11ft tinny, tried others even stainless but can’t argue with what works best. Your motor has a 2 to 1 gear case drive and the 15 super (18hp) has a 1.84 to 1 drive. I have owned that motor you have and was impressed so definitely try some setups and keep me posted. Cheers 🍻 Aussie Boat Guy 😎
@@25hpboatracerman Many thanks for getting back..prop balance is all a ok..just neglected with paint flaking and lifting..have sanded all back and will paint in next couple of days...a mate has an unused 9 x 10 1/2 that I can have..... Smaller diameter from 9 1/4..bigger pitch.... So that will be interesting.... Smaller diameter give it better holeshot ? I'm lovin that 11 footer, what a great hull..my neighbour has an older minter Quintrex 375 that a kiwi brought back home to live.. didn't like it and went back to Oz.. neighbour bought the rig for nz$5000 15 years ago..absolute mint yammy 20..does 46kph.
Hi mate, I have never worried as I never add too much compression, some of my mates add silly amounts on there race outboards and run the same plugs. Worth look into though mate. Cheers Aussie Boat Guy 😎
Hi mate, I use factory gaskets always and permatex airo gasket joining sealant. Never silicone based stuff. For the crank case halves use a crank case sealant, I believe it’s locktite crank case. Check your manufacturer for what sealants they require. Please do not just use an all in one gasket sealant, buy the appropriate gaskets and use the appropriate sealants, it is a cheap part of a rebuild Cheers 🍻 Aussie Boat Guy 😎
Hi mate, Unfortunately not, a bigger carb on that motor without porting does nothing as it is so restricted it cannot accept more fuel - air mix, on a lot of outboards you can add a bigger carburetor (make sure to get the jetting correct) and you will gain a bit of hp - like the 30hp Yamaha 3 cylinder, the 40hp Tohatsu carbs fit and give more power. cheers 🍻 Aussie Boat Guy 😎
Hi mate, After this re-build I recommend normal new engine run in - double oil etc Not over 1/2 throttle for the first 2 hrs and so on until the 10hr process is complete as this ensures that all the parts wear in and treat properly. Wish I did that 😂 I lost some compression due to inpatients 🤷♂️ Cheers Aussie Boat Guy 😎
@@_.R.F.X.L._ You should not rev a motor for long without load to control the revs some what. Definitely under load with a prop for testing. Cheers Aussie Boat Guy 😎
Hi mate, Got bigger jets and throat in carb. but the main difference in power was gained by porting. I would say more like 2hp gain, you can check out the comparison vid comparing to a stock 5hp. cheers, Aussie Boat Guy 😎
Hi mate, We have a few different Mainer 15hp motors here one built by Mercury USA and one built by Tohatsu. I would look on marketplace or eBay. Do you have any outboard wreckers where you are? They may have a pull starter for your 15hp. Cheers 🍻
@@25hpboatracerman He was right that buying through e-bay couldn't be done for shipping reasons so I couldn't buy a 15 HP mariner pull recoil starter. may i ask for help Mr. how can I get the item I mean.
One of the best hop up videos. I got so inspired to try the same on my 2.5 tohatsu.
Cheers mate 👌
With your 2.5hp tohatsu, if it’s a two stroke you can remove the restrictor washer from behind the carburetor and it’s a 3.3hp straight away. Nice and easy 😎😎😎
Thanks again mate,
Aussie Boat Guy 😎
Thanks for putting up these tests and videos. I'm trying to work out which 2 stroke to use as an auxiliary outboard to complement my 115HP on my 5.2m centre console and your videos have given me an insight into engine sizes and props.
Thanks for your comments mate, really appreciate it 👌👌
Happy the vids help.
Cheers
Aussie Boat Guy 😎
Too easy mate,
How did you go finding an auxiliary?
Cheers 🍻
Aussie Boat Guy 😎
@@25hpboatracerman I haven't got one yet. Every time I see a a suitable one it's either already sold, or the seller wants twice as much as it's worth, or it's a 1000ks away. I'll give it another go as it's the middle of winter now so there may be more available.
@@RobB-vz2vo
Persistence will pay off mate.
Cheers 🍻
Awesome vid mate. Any suggestions to getting more power out of a Two stroke Yamaha 8hp?
Great videos! You might already know this but the Yamaha 6hp/8hp 2-stroke have almost identical carbs as these. I’ve considered trying one on these on this motor.
Hi Mate,
I didn’t know that, thanks 👍
Will check them out, I have not played with the small hp yams much.
Cheers 🍻
Aussie Boat Guy 😎
The only mod that I can see is to fill in a slot for the fuel pump pulse to the block. The engine your modding has the half round port over to one side, and the Yamaha has a straight to the block port.
I have both engines so I might try the mods you have done and add the Yamaha 6 or 8hp carb.
That’s a great vid showing the details, so easy with some of the new small fuel injected four strokes that share a block etc, just buy the new fuel injection model and air intake mod to change from 9.9 to 15 and then change back again. But still not the punch and simplicity (smell) of a two stroke. Keep the vids coming please, love the content.
Thanks mate 👌
Really appreciate your support.
Cheers 🍻
Glenno
Interesting stuff. I have done chainsaws and used a timing wheel to get timing of the ports and transfers to where I wanted them. Yeah it's not about just hogging it out as much as possible. You will end up with a 2 stroke with no low down toque. Good video.
Hi mate,
Thanks 👍 I really appreciate your comments.
Definitely need to be careful when porting and I definitely have a lot more to learn too.
cheers 🍻
Aussie Boat Guy 😎
Dear Sir,
Is it possible to do tuning on a 4-6hp outboard motor, but a four-stroke one, or is a two-stroke engine best for something like that...?
Hi Mate,
Yes, I’m sure you can tune the four stroke motors but I’m not really knowledgeable on those. Turbo?
Cheers 🍻
Aussie Boat guy 😎
Great mate that 5 goes like a rocket definitely the way to go if u want to get the best out of your motor its a lot involved but awesome. Good explaining buddy good vid as always.
Cheers mate, it was a fun project.
Wish I had more time to do more things like that.
Thanks again
Aussie Boat Guy 😎
Simply awesome! You give me hope for my 1992 NS5B (non running). Around the 3:55 mark you mention shaving the head... eyeball / feel situation or did you shave an exact amount? Thanks for the videos!
Cheers mate, appreciate your comments.
I shaved the head to an exact amount and then re-tuned the pot. You cannot shave the head on the 5 without re-turning the squish band and the pot.
I would leave the head and the stock carb, the biggest difference was the porting.
Thanks again mate
Aussie Boat Guy 😎
Hi mate! Cheers from finland. Did you raise the transfers, and how much? And how much did yo raise the exhaust? I have two similar engines, and planning on doing the same tweaks on one of them.
Hi Mate,
Yep, raised the transfers. I cannot remember exactly how much but think it was only about 1mm on the transfers and more like 2mm on the exhaust. Unfortunately I have lost the calculations and port map I did.
Cheers 🍻
Aussie Boat Guy.
@25hpboatracerman thanks for the reply. That's about the same I have come up with. Can't be too ambitious or all low end torque is lost. With 10" aluminium self made cleaver, lightly ported 5hp my 10 year old came up to almost 22 knots. Now I'll try to make an engine that would make 25kn 😅
Hi just wondering if the increased compression results in a harder pull start pressure. Love the video and I'm now looking for a 5hp tohatsu for a bit of fun
Hi mate,
Yes definitely. Now that the motor is run in the compression is 145psi. It’s still not to bad to pull start.
Keep in mind a 25 - 30hp tohatsu two stroke has about 150psi comp and they are still pull start.
Cheers
Aussie Boat Guy 😎
im a yank, but i have a 58' 18hp evinrude that im thinking about trying to find a larger, more modern carb to swap on. do you by chance have an idea about what carb would be a good idea to look into?
Hi Mate,
The 58 Evinrude is a beautiful motor, i don’t know how much more power you can get. You may start with a 25 to 35hp omc carburetor but probably won’t just bolt straight up.
Cheers 🍻
Aussie Boat Guy 😎
Hi Aussie Boat Guy! Can you help me please? I have 2003 Tohatsu 5hp, I have replaced crank bearings with top quality sealed bearings, QUESTION" I found a vacuum hose with One Way Valve in it from cylinder to lower case, is this for oil to bearing or pressure for lower crank seal? " As I was going to remove if for lubrication of bearing! And I have done all your mods from porting exhaust, intake and carb grinde from 15mm to 17mm, high compression head work, after market reeds, and rejetting! Thankyou, or anybody! Love all your videos cheers!
Hi mate,
I would remove the bearing face plates so that they can be lubricated by the two stroke mix like the factory ones, not sure what probs could occur from having sealed ones?? If it was a good idea, they would be in all the motors from factory.
That line is to circulate oil from the bottom of block to the top, leave installed and make sure it goes on the same way as it has a one way valve in it.
Hope this helps mate.
Cheers 🍻
Aussie Boat Guy 😎
Mate do you do motors up, for people or just your self? I have a 5hp that needs a little bit more go, and thinking what you have done here would work a treat.
Looks like you know what works the best for them
Hi mate,
Unfortunately I don’t modify motors for people, way too much labour to be worth it for a little motor.
cheers 🍻
Aussie Boat Guy 😎
How tight of squish can you safely go on a typical 2 stroke outboard when having a head shaved ?? Just not sure what size or make outboards have heads or bling hole cylinders. Love you videos brother. Yours in 2 stroke outboards
Hi Mate,
It likely changes with most motors, I tend to shave about 20 though off some of my stock heads as a start. Some the squish is to close to the piston to shave any off without re-turning the squish.
on some motors I remove the head gasket, re-bolt the head on gently and check squish with that thickness removed as a start.
Cheers 🍻
Aussie Boat Guy
I was just looking at cleaning up the transfer ports if they needed it and skimming the head on mine. How much did you skim off the head or what squish were you aiming for. Thanks.
Hi mate,
When you shave the head on the 5hp you also need to turn out the pot as the squish band is already pretty tight.
Cheers 🍻
Aussie Boat Guy 😎
@@25hpboatracerman Thanks. Sounds like a job I will leave for those with plenty of 2 stroke modifying experience. I presume it only adds a bit of torque anyway.I will smooth out the ports and not enlarge them.Could easily stuff something up there..Great video and info. I might look out for an old motor to be a bit more adventurous on.
@@GrahamSmith-g3j
Yeah, that’s the go, grab an old one and you can port away and learn what works etc.
All the best
Aussie Boat Guy 😎
Hello, I saw your project with the modified engine and it turned out very well. I own this boat engine and I'm thinking of doing the following, pop-up piston 0.3mm, intake with enlarged exhaust and reaming the cylinder head (spark plug) with 0.2mm. What do you say, is it good?
Hi mate,
Sounds ok 👍
Just make sure what you do to the dead adds sone compression, one is at 145psi now and you could probably even go to 155psi.
Cheers 🍻
Aussie Boat Guy 😎
Great info and video! What was your speed before the mod and what is it now? Thanks
Hi mate,
I put a video up of the water test between stock and modified, it’s on my channel, decent difference 👌
Cheers 🍻
Aussie Boat Guy
@@25hpboatracerman thank you, I just found it! This is awesome! This is just what I was looking for.
@@rrrttt1112
Too easy mate, glad you liked it 👌
@@25hpboatracerman did you have to change anything with the exhaust?
@@rrrttt1112
I just changed the exhaust port, I didn’t do any mods to the leg of the outboard.
Cheers 🍻
15hp question..just bought an older mint kiwi 12' tinny(Ramco) for harbour fishing....has 2006 Merc 15 ..USA.. tiller gear shift..262cc ..has a 9 P blade that paint is pitted and lifted...gonna sand it off and repaint with Wattyl Kill Rust..my fav..epoxy in a can...however...was thinking of putting on an 11P ...just me (112 kg ) and some stuff ... Your thoughts on the 11P..cheers...ooooor...get a 15 super and make it an 18 ?
Hi mate,
My mate used to deal Ramco boats in Australia, I liked them 👍
The USA merc 15 is a nice motor and if in good nic they are smooth and quiet too. Firstly I have a few vids on balancing props you might want to check out if your prop is a bit banged up.
I am not sure you would spin up an 11p but worth a try for sure.
Often for example the 9p will get up on the plane well and top out at say 40kph revving at around 5800rpm and an 11p may be slow up onto the plane, top out at 40kph revving at 5100rpm.
Like going up a hill in your car in 3rd or 5th gear.
In saying that, I always try different props to find the best performer for each setup.
I am currently using a 10p alloy on my 18hp 11ft tinny, tried others even stainless but can’t argue with what works best.
Your motor has a 2 to 1 gear case drive and the 15 super (18hp) has a 1.84 to 1 drive.
I have owned that motor you have and was impressed so definitely try some setups and keep me posted.
Cheers 🍻
Aussie Boat Guy 😎
@@25hpboatracerman Many thanks for getting back..prop balance is all a ok..just neglected with paint flaking and lifting..have sanded all back and will paint in next couple of days...a mate has an unused 9 x 10 1/2 that I can have..... Smaller diameter from 9 1/4..bigger pitch.... So that will be interesting.... Smaller diameter give it better holeshot ? I'm lovin that 11 footer, what a great hull..my neighbour has an older minter Quintrex 375 that a kiwi brought back home to live.. didn't like it and went back to Oz.. neighbour bought the rig for nz$5000 15 years ago..absolute mint yammy 20..does 46kph.
Dónde tienes tu ubicación y tu taller para llevarte un motor
Hola amigo,
Lamentablemente no tengo un taller público.
Salud,
Chico del barco australiano 😁
Hey mate do you have to change sparkplug or re gap them when you raise the compression? Cheers 👍
Hi mate,
I have never worried as I never add too much compression, some of my mates add silly amounts on there race outboards and run the same plugs.
Worth look into though mate.
Cheers
Aussie Boat Guy 😎
What gasket sealant do you use, and do you use it with paper gaskets or just sealant?
Hi mate,
I
use factory gaskets always and permatex airo gasket joining sealant.
Never silicone based stuff.
For the crank case halves use a crank case sealant, I believe it’s locktite crank case.
Check your manufacturer for what sealants they require.
Please do not just use an all in one gasket sealant, buy the appropriate gaskets and use the appropriate sealants, it is a cheap part of a rebuild
Cheers 🍻
Aussie Boat Guy 😎
@@25hpboatracerman Thanks mate ☺️
Would you get away with just a carb upgrade ?
Hi mate,
Unfortunately not, a bigger carb on that motor without porting does nothing as it is so restricted it cannot accept more fuel - air mix, on a lot of outboards you can add a bigger carburetor (make sure to get the jetting correct) and you will gain a bit of hp - like the 30hp Yamaha 3 cylinder, the 40hp Tohatsu carbs fit and give more power.
cheers 🍻
Aussie Boat Guy 😎
bro love the videos
Thanks mate,
Love your encouragement 👌👌
All the best
Aussie Boat Guy 😎
Do u have any recommendations for jetting for a 15 fmhs , lots of low down bog
Hi mate,
Unfortunately I don’t do modifying to the four stroke outboards so I don’t really have any recommendations.
Cheers 🍻
Aussie Boat Guy 😎
This is 2016 2 stroke , I may have got the codes wrong, I was thinking an aftermarket carb if there is something that might bolt up.
Hi Mate,
Sorry, my bad, it was me that got the codes wrong.
I have not played with the Yamaha 15hp before unfortunately.
Cheers 🍻
Aussie Boat Guy 😎
How you recomand first run the engine after this operation?
Hi mate,
After this re-build I recommend normal new engine run in - double oil etc
Not over 1/2 throttle for the first 2 hrs and so on until the 10hr process is complete as this ensures that all the parts wear in and treat properly.
Wish I did that 😂
I lost some compression due to inpatients 🤷♂️
Cheers
Aussie Boat Guy 😎
@@25hpboatracerman can i do this in my water tank with no propelor moovingm or need to be in lake under heavy condition?
@@_.R.F.X.L._
You should not rev a motor for long without load to control the revs some what. Definitely under load with a prop for testing.
Cheers
Aussie Boat Guy 😎
What minim gap is for rings?
Hi mate,
You will have to check with your parts supplier, it is different for each motor.
Cheers
Aussie Boat Guy 😎
@@25hpboatracerman i have a yamaha 5e3 1990
Try replacing the 2 hp outboard engine carburetor, replace it with a larger one
That sounds like fun 🤩
Unfortunately I don’t have a 2hp at the moment.
Thanks and all the best 👍
Aussie Boat Guy 😎
Do you think you gain 1 extra hp? And if you put biger jet ?
Hi mate,
Got bigger jets and throat in carb. but the main difference in power was gained by porting.
I would say more like 2hp gain, you can check out the comparison vid comparing to a stock 5hp.
cheers,
Aussie Boat Guy 😎
@@25hpboatracerman do you have instagram?
@@25hpboatracerman 2 hp will be ideal for me
@@_.R.F.X.L._
Hi mate,
I don’t have insta yet.
Cheers 🍻
@@_.R.F.X.L._
It still won’t have the torque of some 7hp but same top speed.
Cheers
saya punya mesin mariner 15 HP tetapi recoil starternya rusak tidak bisa diperbaiki, apakah ada yg jual di australia...
Hi mate,
We have a few different Mainer 15hp motors here one built by Mercury USA and one built by Tohatsu.
I would look on marketplace or eBay.
Do you have any outboard wreckers where you are? They may have a pull starter for your 15hp.
Cheers 🍻
@@25hpboatracerman He was right that buying through e-bay couldn't be done for shipping reasons so I couldn't buy a 15 HP mariner pull recoil starter. may i ask for help Mr. how can I get the item I mean.
@@hijrah-wt2ul
Hi mate,
Unfortunately I don’t have one at the moment.
Do you have any local outboard guys that pull them apart to sell?
@@25hpboatracerman in Indonesia it is difficult to find the same item for the mariner 15 engine. thank you friend.
I hope friends can help me..
Yeayea na na hm hm 👍
😂😂 👌👌😎
What does bending back the reed valve stops do?
Hi mate,
it allows more fuel and air mix to enter the crankcase at full throttle.
cheers 🍻
Aussie Boat Guy 😎