tranny or carbs?

[BPryz]

When I am in any gear, and just let off the throttle and let the idle speed pull me along, the speed is inconsistent. I am not sure how to describe it, but it is in essence as if the bike were bucking, but it won't shut off. It'll get a quick shot of power, then none, quick shot, then none, almost as if someone were giving me a quick nudge from behind every other second.

Is this a transmission problem, or can this be attributed to the carbs not being cleaned or properly synced?

I guess I should also note that when in neutral, I do not have a stable idle. It will bounce around from 1400 to 1000 RPMs.

[LAsunbird86]

Is your chain tight? Before I ever tightened mine, on light throttle and when I would just let off the throttle it would buck pretty hard. Once I tightened it though, it was much better.

[BPryz]

Yeah, the chain is set to proper tension.

[tejasandre]

Your rough idle is the problem. But, don't let your bike idle In gear while riding... Give it some gas or put it in neutral.

[BPryz]

Your rough idle is the problem. But, don't let your bike idle In gear while riding... Give it some gas or put it in neutral.

Does it cause serious problems or damage? I just use it when im cruising through a parking lot sometimes, or if I'm looking at some scenery

[scottynoface]

But, don't let your bike idle In gear while riding... Give it some gas or put it in neutral.

Um...what?

[zooki91]

try turning the idle screw? I'm assuming its idling at 2-4k ?

[BPryz]

no, I said before it idles around 1000 to 1400 rpms. 2k-4k is WAAAAY off. I'd be a bit more worried if it was idling around there.

I have tried the idle adjustment screw and I can't get a stable idle that way either. I know I need to clean the carbs.

The question is whats causing the problem. If we all agree that it's the carbs, then thats my answer.

[loudnlow7484]

I can't say I've ever attempted to idle around like that..... why would you? Stunters need that, so the bike will keep moving even when they aren't touching the bars, so they jack up the idle speed. I can't think of a reason that a normal rider would want to ride the bike at idle.

Why doesn't it work? Because carburetors don't adapt to the load you put on the engine. If your idle is set at 1200 rpm, then you're letting just enough air through to create enough power to overcome engine drag at 1200 rpm. Any additional drag (like moving a 500lb motorcycle) is going to lower engine speed, which lowers engine vacuum (which lowers the fuel coming through the idle circuit), and that happening on a bike that doesn't idle terribly well to begin with results in what you have going on there.

That surging you describe is usually a symptom of running too lean. Look for a dirty pilot/idle circuit, or a vacuum leak. I would do the brake cleaner test before pulling the carbs.

[zooki91]

I can't say I've ever attempted to idle around like that..... why would you? Stunters need that, so the bike will keep moving even when they aren't touching the bars, so they jack up the idle speed. I can't think of a reason that a normal rider would want to ride the bike at idle.

Why doesn't it work? Because carburetors don't adapt to the load you put on the engine. If your idle is set at 1200 rpm, then you're letting just enough air through to create enough power to overcome engine drag at 1200 rpm. Any additional drag (like moving a 500lb motorcycle) is going to lower engine speed, which lowers engine vacuum (which lowers the fuel coming through the idle circuit), and that happening on a bike that doesn't idle terribly well to begin with results in what you have going on there.

That surging you describe is usually a symptom of running too lean. Look for a dirty pilot/idle circuit, or a vacuum leak. I would do the brake cleaner test before pulling the carbs.

agreed, my guess is a dirty pilot.

[BPryz]

I can't say I've ever attempted to idle around like that..... why would you? Stunters need that, so the bike will keep moving even when they aren't touching the bars, so they jack up the idle speed. I can't think of a reason that a normal rider would want to ride the bike at idle.

Why doesn't it work? Because carburetors don't adapt to the load you put on the engine. If your idle is set at 1200 rpm, then you're letting just enough air through to create enough power to overcome engine drag at 1200 rpm. Any additional drag (like moving a 500lb motorcycle) is going to lower engine speed, which lowers engine vacuum (which lowers the fuel coming through the idle circuit), and that happening on a bike that doesn't idle terribly well to begin with results in what you have going on there.

That surging you describe is usually a symptom of running too lean. Look for a dirty pilot/idle circuit, or a vacuum leak. I would do the brake cleaner test before pulling the carbs.

Its not necessarily that I want to, I am just guessing that there was something that wasn't quite right and I like my toys to run perfectly.

Thanks for suggestion, I am going to be taking the bike apart over the winter and working on/replacing a bunch of stuff, carbs being one of them. I just wanted to make sure that I didn't need to add anything onto my list.

Thanks guys!