i have a problem that im not sure how to fix. before i start i will explain something. After having the bike for about 5 months now i was ready to make some noise. So, i purchased a jardine muffler. After installing it i was shocked at how loud it was but also didn't like all the back firing. so i took the carb out, cleaned it, and put everything back together. i also did the white spacer mod. as it is now it has the stock jets. now heres the problem. when the bike is at idle its fine but when i hit the throttle hard it acts like it wants to die when the rpm's come back down. it doesn't die but acts like it. every time i get above 70 mph and hit an exit ramp things start to happen. after going above 70 mph and then slowing down to lets say 30 the engine shuts off. after wondering what was wrong i gave the bike a good look over and found that the vacuum line hose had a crack in it. so i replaced it but i still have these problems.       thanks for your time.

Whenever you make a modification, and it results in something you don't like, go back and undo it. If that corrects the new problem, you know that modification didn't do what you wanted. That's the reason for doing one thing at a time, and keeping notes.

charon...... i tried that approach. after the shut off i put the stock muffler back on and the problem still occurred. as far as the white spacer mod i just shaved the spacer in half. do any of you think it has to do with the jets or the fuel mixture screw? i ordered a jet set and hoping to try out the 150 main and 155 pilot....... time will tell.   thanks for the help.

Id put the muffler back on & prove its just jetting, if it doesnt run like it did before the swap, you fixed it broke,.

hahahahaha......well i understand what people say about the headaches now. so, took the carb back out looked over everything. everything seems to be in order and recleaned it. checked all the hoses and they all seem good. it seems we have an update in more problems. after doing it all again, ive lost count now, the bike barely wants to start. before, it only wanted to die at idle when i hit the throttle hard now it wants to die when i give it about 1/8 throttle. the bike acts like its not getting fuel, it will run for about 10 or so seconds then slowing die. i dont understand this because i didnt do anything different then what ive done before. could it be a faulty petcock? SWEET MOTHER OF GOD( it slams its head against the wall)

hahahahaha very nice, very nice indeed! i shall try calling on the raptor.

Since the jardine will make it run lean what kind of slip on muffler do you advise.

adrinachrome wrote on 07/20/12 at 20:36:45:

It's already lean from the factory unless your in high altitude areas in stock form. On Carb'd motorcycles any change in allowing the engine to breath differently, you are going to have to do some carb tuning.  The same applies to cars as well but they aren't as sensitive to the changes that small displacement engines are.

R.F.