Hi there,

Racing Bikes and cars is my passion and for almost 20 years. I bought my first fourwheeler during my yearly visit at my friend place in Baton Rouge Louisiana. Now I just bought a 2006 TRX with a high compression Wiseco piston in it, other camshaft (have no clue about degrees or camprofile because my friend is not at all a technician) and other needles in the carb. Now he has put on a standard exhaust and filter box. The problem I have it that if you accelerate hard that he hold's back. Also if you accelerate gently to max RPM he stutters and in higher rpm's gains some smoothness. I can drill some holes in the filterbox but need some advice for the exhaust. Would a slip on be enough, and which one. it dousn't have to make to much noice because my neightbour is an Al Gore fan and thinks he can save the world by driving his bicycle!!!
So please some expertese on the exhaust.
I know that my facts and info on the bike are not very technical (hate this because I tune race engine's for years) but I don't have more info without opening the carbs and engine.

Thanks a lot already for reading my problem

Tom

sounds like jetting is wacked. if it was me, i would go buy the HRC jet kit and start over from scratch. i would say it pry has a hot cam camshaft in it. just because they are very popular

Your best shot at getting an answer to your engine question is definitely to post it in the raffle section.

yeah, 10 wrong answers for 20 bucks.

Id ask for your question to be moved to the engine section and youll get more help. You might want to find out what jets and cam you have because they will need to know that to help you.

I feel dumb telling you this since you have experience with high perf. car engines, but have you considered that since you have an aftermarket camshaft installed that your valves might need to be adjusted regularly, and it might run "lumpy" because of the camshaft installed? Depending on which stage/brand of cam you have it will run differently. Also with a bunch of different carb settings on a completely stock intake/exhaust system messes with the engineering behind the orignal setup. A camshaft doesn't require any fuel setting changes. I'm confused about why the original owner would change the needle unless the sea level was requiring these changes. I'm going to guess if u check your main/pilot jets they are going to be too big. The best thing to do would be take your carb out, clean it, and rejet. Once you do that you could buy a full exhaust and remove your airbox lid and buy a twin air air filter to fully utilize the aftermarket camshaft installed previous to your purchase. You should talk to the person you bought it from and check out which stage/brand of camshaft he installed. Then you can tune your bike and purchase future parts based around that cam.

I assume you are saying that before you bought it the bike had a aftermarket exhaust/filter and the bike was jetted for it. So, Either jet back down to accomodate your stock exhaust/filter or buy and exhaust and filter kit to accomodate your jetting/needle setting. Dont waste your money on a slip-on. just get the used full exhaust if your looking to save money. I picked up a nice looking yoshimua full alum race exhaust for 100bux on cl, i got lucky maybe but those deals are out there everyday, just gotta look.

Your cam, jetting, carb, Exhaust, and values should all be checked and fixed at the same time. You will have to do some looking at exhaust if you do plan on keeping the noise down but get the biggest power gains. It dose sound like the bike just has to many mixed match parts and there not all work right at the same times. If you do have a cam and a stock exhaust this maybe your main problem. With the cam, exhaust and high comp piston the stock pipe will not hold up to the extra air flow that is needed for the engines needs.