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**jonathan180iq** · 01-06-2011, 01:58 PM

If it has an Ebay pipe that is already backfiring, then your mixture is bad and chugging and choking at high speed could also be a symptom of that.

You may beef to up the gas flow a little with a rejet. It's really not hard at all and you can do most of the adjustments without pulling the carb or the gas tank.

Simply drilling holes in the back of your stock muffler will lean the bike out and something as simple as an unplugged breather hose can make it almost unrideable. It's a delicate balance that has to be kept and the PO slapping a universal muffler on there is most likely the cause of the problem.

EDIT: Since this only happens at high speed, close to WOT, it means your main jet is where you need to focus. I'll bank that the PO adjusted the idle mixture screw and the needle, which would take care of low speed and midrange but he probably didn't adjust the main jet.

01-06-2011, 01:58 PM	#4
jonathan180iq Super Moderator Join Date: Jan 2007 Location: Dalton, GA Posts: 3,995	Re: shut off at high speeds If it has an Ebay pipe that is already backfiring, then your mixture is bad and chugging and choking at high speed could also be a symptom of that. You may beef to up the gas flow a little with a rejet. It's really not hard at all and you can do most of the adjustments without pulling the carb or the gas tank. Simply drilling holes in the back of your stock muffler will lean the bike out and something as simple as an unplugged breather hose can make it almost unrideable. It's a delicate balance that has to be kept and the PO slapping a universal muffler on there is most likely the cause of the problem. EDIT: Since this only happens at high speed, close to WOT, it means your main jet is where you need to focus. I'll bank that the PO adjusted the idle mixture screw and the needle, which would take care of low speed and midrange but he probably didn't adjust the main jet.
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