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Predator 420cc Performance Mods!
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- Опубліковано 18 сер 2017
- In this video I show you how do do a number of performance modifications to the Predator 420cc engine. This engine is rated for 13hp stock, and after these simple mods it should put out about 20hp, but that's just a guess.
This video is longer and more tedious than my usual videos, but I tried to provide as much information as I could regarding these upgrades.
Times:
gas tank------------0:27
exhaust-------------1:00
intake----------------1:26
carb jet--------------7:25
governor------------8:30
low oil sensor---13:59
throttle linkage-15:43
valve springs----17:06
Intro music is "Garage" by Tropher Mohr and Alex Elena
people doing diy project in youtube should exactly follow your way to do it, clear video, no noisy music and does not have other bs unrelated to the project, good job kid.
EXACTLY!!!
What he said. ⬆️
Tip: put grease on your tap then it will both lubricate the threads being cut and the grease will hold 99% of the shavings too.
preciate that advice
Best DIY video I have ever watched. Not just showing how to do something, but also explaining exactly what everything is. I learned in this one video everything I had questions about. Anyone who is looking to mod a 212 or 420 should watch this video before even looking at a screw driver or drill. Thank you, sir!
Thank you for the video bud. There's a lot of 420 mod videos out there but yours was by far the best and easiest to follow and I appreciate you sharing your time and knowledge 👍🏻
Get yourself a valve spring tool and save yourself potentially serious injury with either the spring or retainers shooting up into your face, or the vice grips pinching the devil out of your thumb. You can also save a fishing expedition into the crankcase for the retainers that way as well.
You can also get a truck brake spring driver (used on drum brake barrel shaped springs that hold the shoes to the backing plate.) It has a screwdriver handle and shank with an open ring at the end that compresses the spring as you push down, while allowing you to rotate the retainers. The retainer tool for trucks should be the right diameter to cup the spring and the retainer cup on top of your valves so you can place the retainers in the cup and stem of the valve.
Watching you using that vice-grip to push down on the spring, I just was waiting to cringe when it slipped and either smashed your finger or sent the vice-grips into your face, glad it all went good!
ImaFurry Gaming
It's Fur-Bee Gaming lol
Will this. Motor just bolt on ?
Mr. Josh Brown Bbbbbvv. Google
Google
Really glad I found your channel. You really explain everything and you still manage to make the video have a steady pace to it. I got into small engines by watching the channel Cars and Cameras, but recently I'm liking your channel much more. Keep it up and you'll do great things.
thanks for watching! I too first got into this stuff from cars and cameras lol Red Beards garage is a good channel too
MacroMachines i need. Work done
MacroMachines. Good work I just brought my 420 a week ago now it's time for modifications
Took me years and years to learn how to hold a drill straight and plumb when hand drilling a hole. I’m 50 now and can only now promise that I can drill a hole straight in! Don’t let that bother you especially if it WORKS when you’re done.
It is practice to put air pressure into the sparkplug hole to keep the valves seated while replacing the valve springs. Very nice video, thanks for sharing.
Confident in knowledge, well structured content and presentation style coupled with excellent photography made this a great video to watch, well done.
The throwing the paint on it bit at the end amuses me. Nice video. Well done. Your experience with these kinds of engines really is apparent.
Again I have no idea why this kid doesn't have more subs, such an engineer giving this vid a heavy like.
OK so I liked it. Been watching a lot of his video and I impressed how much he knows and how well he does it.
Because "drill slightly bigger" isn't a measurement.
Thank u enbiggen hole is not engineering. This kid is not an engineer. He is doing everything u should never do unless you are trying to kill a motor. No reason to diable low oil sensor EVER!
@@TrapperAaron It is true all the modifications he is doing to this motor can decrease engine life. But he stated that he is doing this for performance, and mods made for more power are always at the risk of less engine life. He also explained the reason for disconnection of the low oil sensor. It is at one side of the block, and a hard corner will, through centrifugal force, throw the oil away from the sensor and kill the power. These motors are made for stationary use and steady power demand, totally different from what he is preparing this engine for. And if he does not realize this can shorten engine life, he will soon learn.
@@ronfullerton3162 no performance here. Just bs
"Because... I can". I love that.
The filter I bought came with the adapter and a hold down for the choke, the spacer (I bought separate) had the correct holes in it. Also came with a bigger jet...I can't recommend using the bigger jet , the engine runs better and comes off of choke faster with the OEM jet it came with.
Can you send me information on the kit you brought?
I have a 420 in a Ducar wood chipper and was wondering why I couldn't get full throttle --- it was the governor -- thank you as your video helped explain it!!
I spent an hour looking for one of my keepers didn't have a good grip trying to put the spring back in and shot out with everything in it I almost cried. Wish I woulda watched your video first.
This guy is like 24/7 in his garadge!!! Love your work dude! Keep it up!
Your delivery of this informative video is second to no one. Fantastic presentation.
great video! instead of removing governor, cant you just disconnect the linkage? instead of removing low oil sensor, cant your just disconnect the wire?
Just to let you know the other method of holding the valves in place is air pressure by installing a modified fitting with a air hose hooked to your compressor to the spark plug hole.
"Because I Can" best reason ever
the paint edit was pretty good not going to lie
That was the best DIY mod I ever seen! I'm referring to you painting the shroud to make it look cool!!!!
When tapping the Governor hole put a tac cloth in there and / or hold shot glass under the hole to catch the metal shavings.
Dude there is so much horrifying and terrible info in this video and ur concered about some drill and tap debris? This video i pray is really a joke. Like what not to do to any small motor ever.
Probably the best video seen for mod 420 Predator thumbs up
this channel is so underrated
So cool ! Can't wait to see how does the engine run !
That thing you did with the red paint can was pretty cool👍👍👍
u did a nice lil video here. u taught me something. now ill have no problems doing these same mods when its time. im impressed. i love working with engines and metal. like welding. i worked at a lil aluminium boat factory and taught myself how to tig and mig aluminium. even anodized aluminum. i thought aluminium was tricky to weld. took a welding class in school to weld mild steel and iron. i have alil mig, tig and stick welder combo. i can even gas weld. again. nice vid lil brother. never stop learning and showing ur skills. u have a nack at it
Really interesting video by a young and upcoming engineer! Really enjoyed it! No bullshit, a true professional! Thank-you!
Great video sir. Will use this as a reference when I move to a stage two for my 420! Thank you!
Just throw that paint! Too cool. Enjoyed it. Natural communicator, you are. Well done. I see a video series for sale in your future. A lion in the chase never looks back
I love how you where spinning the engine around with string
You can use air pressure to hold the valves back using a compression guage hose & air hose nipple ,Get yourself a round brake anchor pin tool great for doing valves too .
good tip
Laughed at the painting :D And awesome tip with the spongy rope thingy! I might use that some day
It's called Backer Rod and it is used for backing a gap so you can caulk a joint and not have the caulking fall deep into the gap.
Could fill the cylinder w air through the spark plug hole compressing when removing n installing the valvebsping n valve spring seals . But all in all. Awesome job
Air works ok, if you have a gearbox to stop motor rotating ! ,the soft rope method is very good , but he didnt show winding piston back toward TDC .
I'd definitely use a rope instead of the foam cord. That stuff would be tough to remove if it rips.
[ On the choke lever ] i drilled a small hole in the lever like you would for a screw. Then i made a few grooves angled downward in the shaft. I mixed up a little JB Weld ,fingered it into the shaft grooves then shot some into the lever with a crack filler syringe. When i pushed the lever down some epoxy came out the top hole and i finger molded it over like a little cap. that was 10 yrs ago and it's still on there. PS i used my dremel for the grooves.. I knew if i tried to drill and tap that shaft i would F#%k it up..lol
Lots of good editing and tricks. Really liked the string at the end.
Thanks for an informative and nicely produced video. One question, though: couldnt you just replace the spring from the throttle arm to the governor arm to raise the rpm while thus raising the max rpm while keeping the limiter function? Thx.
I thought I was doing good tuning up my GX390 on my pressure washer. You Rock young man . :)
Do they still have small engine class in high school? They did when I was a kid (35 years ago). This kid would be a great teacher for it.
again, this kid is great! I like the custom adapter for the air filter. also props to the paint job. that had me laughing! keep up the good work real steel.
Those thingies that you're calling "pegs" are studs.
You're welcome.
8-)
Thanks for the lesson on how to do this correctly in the process of changing my golf cart to gas engine
he knew what lash caps are.....well done
cant u just remove govenor link on outside of engine,without removing internals?,if it dont close butterfly valve it dont govern it ??
Change spring
I know this is an old comment but I was thinking the exact same thing, just remove the governor arm and call it done, also just unplug the oil level sensor wire on the outside. Loads of extra non value added steps. We'll not mention the valve clearance on the exhaust port is normally more than the intake as it runs hotter and expands more, so his original clearance was fine.
@@robevans8555 You can, but then you run the risk of the governor flying apart in there with the higher rpms. Much better to just remove it.
Not to mention removing the extra unnecessary weight
yes i'm looking for a tool for the valve springs. i am having trouble on my predator 301....great video young man!!!!
This is a very informative video awesome job man.
thanks!
Just a thought, a small putty knife, very thin and flexible work well to help save gaskets.
Good explanation and informative 👍
Was hoping we would get to hear it run
brasil- rio de janeiro: faltou ligar , pra ouvi o som!
( missed calling to hear engine sound!)
I saw that you are building a motorcycle with this engine! congratulations .. you are a smart guy!
Good job. Those areas where small parts fall into are called "hell holes"...always plug/cover them before taking stuff apart that could fall in there....I think you figured that out though.
You'll find a nice performance increase by using an offset flywheel key to advance the timing by about 2 to 3 degrees.
I remember something about doing something similar on certain year Ford 460 engines that was good for 50 horsepower. After playing with small engines and then air cooled Volkswagens it was amazing how just a few thousands in valve adjustment could effect the engine so I can only imagine changing the valve timing.
thank you for the quality step by step!
This was fantastic. Do by chance have part numbers for anything?
A brass soft plug is my preferred mod for the governor shaft plug.
you are the same as me. 24/7 working on cool shit
This video was awesome 👌 no bullshit straight forward good job thank you for making this video
If you’re worried about not being able to get all the backer rod (sponge thingy) out of the cylinder, you can use an air hose fitting to screw it into the spark plug hole and apply 100psi air to hold the valves in place. I’ve done this multiple times when replacing valves springs on Chevy LS motors while it’s still in the truck. This was a great video, and I doubt you’ve put it on a dyno to see the power increase, but do you have any idea how much power increase you got, or how high you can rev the rpm’s?? I know the factory governor had it at 3600 rpm’s.
A+. Extremely well done.
23:20 - "This Old Tony" - Awesome!
Can you just leave the governor arm and rod on if you just remove the flywheel? Or does it all have to go?
I was thinking the same thing just unhook it from the throttle
THANK GOD you bought a pre-drilled ported Main jet Bc given your drilling skills you probably would have gone through 3 of them before you got it right
Young Master,
Thank you! I have liked and subscribed.
I know the struggle of getting those valve clips in the pushrod holes, frustrating.
After removing the GOV , I would have installed a billet rod to keep the engine from throwing the stock rod because of to many RPM'S.
You can make a spring removal / install tool ( for removing valve springs) from a large C clamp , weld a small piece of tubing on one side of the c clamp but cut out a section for room to insert the small keepers.
Can you do a video on that?
@@edgravely1947 ... I may do that.
@@edgravely1947 ... I did a video on the c-clamp . see it on my channel
Also I recommend a billet flywheel you lose charging is only issue but they make them with the ring gear for electric start I have seen 5 now on mine and others carts explode over 5 grand
@@spinningtireproductions105 ...Yes, billet flywheel also, less rotating mast it will rev faster.
That thick carbie gasket can also be found on the Honda Buffalo lawn mowers
Great job !! very well executed nicely explained.. Just Subbed
great to have you watching!
Like the paint ending !!
Good job mate
Why open the case to remove the governor sprocket? Why not just remove the arm and spring? Same end result?
Buller...
TheJake In78 that’s what I thought, seems to make no difference
That, because I can line is my favorite to use 😂
excellent presentation. Well done.
Great video 😊
Paint job straight outta "This Old Tony", lol
Good job you will go far!
your vidios are so good that i can watch them again again again...
You the best paint thrower I ever seen ,,,,,,,damn
All that work you should have put a bigger cam in and removed the balance shaft !
Why not just disconnect the governor linkages and leave it in place? Also, as mentioned elsewhere, oil sensor could just be unplugged.
Or why not just take the governor gear out and leave the linkages so that you wouldn't have to do all that flipping around with the throttle arm
Dude you’re awesome
One of the Best Videos.
If instead of boring that hole through your aircleaner adapter in one size all the way from carb to inlet you had tapered it from about twice that diameter at the inlet to the size needed to match the carburetor you will have a much greater performance gain.
Where's. Your valve spring compressor?
Nice video, very helpful 🙂
nice editing on the paint
GET YOURSELF A SPRING COMPRESSOR AND A FLEXIBLE MAGNET
Tight is right. Too tight is broke!
If you don't change the emulsion tube that drilled jet won't do shit. I'm not being mean I'm just giving advice.
Small engine dude I have the 8 horsepower what size tube am I going to need I'm going to be running a 37 Jet right now I have a 36 in it but it seems it's just not going to be enough to allow me to open up the 301 CC Predator but no governor so which one do I need 4 the 36 because obviously the 36 jet isn't even working because I didn't get the tube so what tube do I need a 36 to imagine I'm going to go look it up but if you can help me
What do you mean??
You can change the jet without making a single change to the emulsion tube. The tube depends largely on what exact motor it is and what carb but the jet will have a large impact on the amount of fuel going into the motor with any emulsion tube. The stock emulsion tube makes great power with a different jet on our 25hp/30ft-lbs kart racing motors. This can be moddified so the amount of fuel is more consistent leading to a flatter Air Fuel Ratio curve.
Nice video man thanks a lot
thanks for watching!
Thank you for this nice video and explanation
An allen head cap screw would look sharp plugging the governor rod hole.
Hello, great vid. Very helpful info. Where can I get upgrade valve springs? I have a 16 hp single cylinder like your one but I can't seem to find any. Do you think the 35 lb springs would work for this engine too?
Thank you for your time.
Cool video and very easy to follow but can i ask after this mod what would the rpm be as i know the stock 420 is 3600rpm
awesome video bud thanks
Nice tutorial
so does the engine run or not?
😁
I was wondering the same thing
$12 at Harbor freight. Works great. Less filling. 🏁
It honestly pays to get a maikuni instead of a carb jet kit.
Agree w u 100% randomly drilling out jet to whatever size does not fly on a 4 barrel Holley, i dont think this would start and if it did run id say wouldnt run for long, and would definitely have less power than stock.
@@TrapperAaron No the jetting and intake is definitely better than stock as I have ran an engine with this configuration with good success on a gokart, but as far as a cost benefit equation goes, a mikuni will be a bit more expensive, but the performance gain is much better. In fairness he machined his own fitting so my argument isn't as strong but if he had to buy one, yeah mikuni.
@@ssplintergirl The Mikuni would be a far better way to go, just more expensive dollar wise, but could pay off later.