is it detonating (sputtering) or bouncing off the limiter?

 

It revs out too early and starts sputtering bad?? It could be jetting/air leak or your cam chain could be off a tooth or two. That's just a couple quick ideas for you to check out..

 

cluttch could be slippin

 

is it detonating (sputtering) or bouncing off the limiter?

I'm pretty sure it's sputtering. Doesn't sound like it's bouncing off the rev limiter.

 

cluttch could be slippin

Hmmm. I've noticed that when I get on it pretty hard out of a corner even when I'm in the right gear it feels like the chain is jumping on the sprocket and it feels really funky.

 

+1 for the clutch.

 

most likely clutch. and if your running low octane gas try some higher octane

 

did you put a bigger carb on it?

 

I'm running 93 octane in it right now, which is what I run in my big bike.



It has a 26mm carb on it because that is what came with the big bore kit. A bit of info I forgot to include is that when my dad was cleaning out the carb one time he took out the main jet and a spring fell out. He got to looking at it and it didn't make sense. Long story short, it wasn't a spring. It was actaully the thread for where the jet screws into the carb. So the jet wouldn't stay in place so we JB welded it into place, so I'm not sure if that would make a difference or not, but it still ran like that before the whole jet issue.



Another thing I forgot to include is that the bike has a yx150 head on it incase that helps.

 

thats your problem. jets are very fussy.

 

JB welded the jet in??? Wow that is enginering right there. Why not just use duct tape? Did you over tighten it?

 

Okay, so down to either needs new carb or clutch is slipping or both. Anybody else?

 

Damn.. JB welded a jet in place, never heard that one before lol.

 

Yeah, I figured since I was going to have to buy a new carb no matter what I did I might as well give it a shot lol. It's actually holding up. I was just procrastinating buying a new carb.

 

I'm running 93 octane in it right now, which is what I run in my big bike.



It has a 26mm carb on it because that is what came with the big bore kit. A bit of info I forgot to include is that when my dad was cleaning out the carb one time he took out the main jet and a spring fell out. He got to looking at it and it didn't make sense. Long story short, it wasn't a spring. It was actaully the thread for where the jet screws into the carb. So the jet wouldn't stay in place so we JB welded it into place, so I'm not sure if that would make a difference or not, but it still ran like that before the whole jet issue.



Another thing I forgot to include is that the bike has a yx150 head on it incase that helps.

very important info!!!! lol!!

 

Damn.. JB welded a jet in place, never heard that one before lol.

Yeah, he isn't the sharpest tool in the shed... haha

 

try your clutch first. my bike doesnt go anywhere when the clutch starts to slip and itll just revv to the moon and fast

 

What's a good way to check the clutch? And if that's the problem what am I looking at to fix it?

 

Im going to say the sputter is probably from the jb welded jet. You can tell if your clutch is going out by riding it down the street. Start it warm it up get to second or third and sack the throttle wide open you will feel it. Kinda like the tire is spinning like your doing a burn out but its not the tire is hooking up its your clutch that's slipping. Look at your tire after you will be able to tell if your tire is spinning or your clutch is slipping pretty easily. Either do that or pull the side cover and look at the plates

 

Your new engine is making more power so one of two things can happen.



First.... It will excellerate quicker because of the new found power.



Second... Your new found power will over come the clutches ability to hold creating said slip.



Just food for thought.

 

Okay, now I'm really starting to think there's something wrong with the clutch because for a while now, every time I ride it, it almost feels like the rear tire is flat even though I check it every time before I get on the track.

 

fill the rear tire full of great stuff!!!

 

Im bettin on the clutch, get kx65 clutches and HD clutch springs and I would replace the JB welded on carb no matter if its the best carb you have ever had and the jetting is spot on. my 2 cents, which adjusted for inflation is about -$1.75

 

Update:



So I just got the bike out and rode it up and down the street a couple of times and I'm pretty positive there's something up with the clutch. When I would get on it, it would rev up really fast but not really go anywhere. Before I wouldn't even attempt to just dump the throttle because I know the thing would loop out on me; when I did it just now it felt like it was accelerating like a stock engine.



What does this mean I have to do now? I would like to know as soon as possible so I can hurry and order the parts because I'm going to try to race next Saturday.

 

What's a good way to check the clutch? And if that's the problem what am I looking at to fix it?

ride the bike and just go threw the gears u know what ur bike felt like before see if its feels like its slipping. itll rev out faster then normal but u can still ride it. mines slipping hard right now i can ride it but when i get on it the motor just revs and bike goes slow. i ordered new plates youll need new plates and hd springs to fix ur problem



if you dump the clutch it should just rev and not pull to hard.. if it does that its ur clutch