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- Опубліковано 2 жов 2022
- 2019 KTM 150SX, which is basically the same as the 125SX. Knocking out a top end job, getting a fresh wiseco piston in there as well as some mild porting. Also cleaning and checking the power valves. Shes gonna be a ripper!
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Thanks for watching!
upallnight91@hotmail.com
This should be able the same from 2019, 2020, 2021, and 2022 for the most part. - Навчання та стиль
Good vid 👍🇬🇧
Thanks!
Excellent video. Very well done sir.
Thanks!
Thanks
It helped
Nice vidéo for top end rebuilt
Thanks!
About to do my GG 125 top end and found your video. Nicely done and I always hand tighten my cylinder bolts by hand as well once you get the feel of it. I would disagree in going with a one ring piston. That’s a super short lived item for racing only. The reason the Austrian bikes go so long on top ends is because of the two rings.
Thanks! And I understand on the single ring. If the piston is expected to run a long life, for sure run a 2 ring piston. I do on my YZ250. However if the bike is being raced or mainly track riden and pistons will be changed out in shorter intervals then a single ring will last good enough. For me whats more important is using a forged piston. I find cast pistons if ran too long will break or crack before the compression fades away from ring wear.
How do you get a torque wrench to fit in between the cylinder bolts to tighten it. Is there a special wrench for that
They sell little wrench extentions that connect to a standard torque wrench. They include a little card with the math needed because the extension extends from the wrench and changes the accuracy of the reading.
Hi, I like your content , you say two strokes need lead, Is valve saver ? is this a lead ? or
what product would I use please, Regards Craig
Well. I don't know off hand a lead additive, but there could be one out there. It needs lead to raise the octane up and control the burn. I use leaded race fuel to get the lead I need. Doesnt take much, can even be mixed 50/50 race fuel and pump fuel to get enough lead ,depending on the motors mods... mainly the head profile.
Thats not a bad price though. PC has got the magic thats for sure. Any time I work on a PC motor im impressed with the level of tune. When you say 2:3 c12 do you mean 2 gallon of c12 to 3 gallons of pump?
do you need to find the tdc with a vhm head when changing the piston?
You mean find the correct gasket thickness so the piston crown matches the top of the cylinder at TDC. I would guess yes. Its safe the assume they cut the VHM head to bolt on a motor as is.
I bought a shock spring from eBay for my 05 yz125 they said it was 2010 but in pen I can see slightly it says 4.9 I was hoping for a 5.3 so is there any other way to help 4.9 be ok for my weight 170/180lbs and I was looking at a .44 fork springs is about right or can I make them stiffer with more oil
Hello. A 4.9 on a 125 on the rear will be ok for you at your weight. It will be on the softer side but surely within range for you on a 125. Up front the .44 will be right on for that rear 4.9. Good balance. Balance is very important with springs and that is a good balance. You can add more oil on the outer chamber to help control bottoming but thats really all it does. You won't feel the extra stiffness of the extra oil till the forks reach almost the bottom. I try to only put in as much as is needed to control bottoming and no more than that, so it also retains smoothness
Ok cheers mate 🤙🏻
My burning chamber spins when tightening the spark plug, do you have any advice? I have cylinder head at 18Nm
Hmm. I would surely take the head off and see whats going on. It could be just bolted down to lightly. But I would pull it off and make sure it hasn't been vibrating around for too long and cause wear of the surfaces
@@UpAllNight91 thanks, I already tried changing the o rings to KTM original spare parts so I guess buying a new chamber is my last option..
@@henning_8246 yeah might be
what website can be used to order the whole set up for The Ktm 150Sx Piston & Cylinder ?
For the cylinder, motosport.com or www.rockymountainatvmc.com/ and also partzilla.com. for the piston, if its just a standard, any of them 3 will carry it. But if its the wiseco race piston, some have it, some don't. But wisecos web page sell them and can always be found there
appreciate it Much love from the 🇧🇸🇧🇸
What does exhaust porting do will it change jetting ?
It doesnt change jetting anything I can tell at least. The pipe works better with a polished exhaust port, the port is the engines window to the pipe .
@@UpAllNight91 how do exausts and port heigh change jetting? And all parts?
@@UpAllNight91 wdym the pipe works better?
@@JackMacdonald-ih3ht The exhaust port is the window to the pipe.
That unburned piece of toilet paper seems fishy... Its not burnt from the cylinder pressure and heat? also, that piston looks a little TOO clean for having just a perfect fuel mixture. Did this motor really need rebuilt?
Hello. The paper was in the water jacket area so I'm thinking a previous mechanic maybe had paper in the radiator cap area to keep trash out and just put the cap back on and forgot it. Juat a guess, I don't know though. The motor didn't really need a rebuild but the owner was about to start a race series and just wanted me be sure everything was good and healthy for a full season.
You weighed the piston without the wrist pin clips.
Maybe next time
Yes, I should have. Next time for sure