hanging idle 2005 mxzx800
Posted 06 February 2012 - 08:52 PM
Posted 06 February 2012 - 10:42 PM
Posted 07 February 2012 - 08:06 AM
Posted 07 February 2012 - 08:47 AM
First, check all your throttle cable routing, then check you oil pump cable for kinks. Make sure you have some free play at the throttle flipper and at the carburetor. If all that is OK, take off the carb rack and inspect the engine side of the throttle pistons. If the coating is worn right off to bare aluminum then you have 2 problems.
Does this sound like worn carb slides?
1) Throttle pistons are worn out.
2) Throttle bore & slide surface are worn out.
You can try new slides and cleaning up the throttle bore while checking with a straight edge on the engine side. You can install #20 pilots and suffer a hit on fuel economy. The biggest problem with TM40s and 800HO engines is the idle vibration literally shakes the hell out of the carburetor hence prematurely wearing out the throttle parts. Most fixes are temporary on these engines and require some time & money. Try the cheap route first and see what happens. Failing that, new carbs are in order.
Posted 07 February 2012 - 09:43 AM
Take out fuel screw and clean the hole it came out of as well as the jets real good. Set idle position and sync with .062 drill bit.
The fuel screw can be turned out to 2 turns to lower idle. Any more does nothing so a bigger pilot will be needed if you want to lower it that way. Fuel screw 1 1/2 - 2 turns, 1 1/2 = higher, 2 = lower.
Adjust the idle screw when engine's warm.
Going up to #20 pilots will help if the carb slides are worn a little, if they're worn alot a bigger pilot would be needed but IMO you'd be better off fixing the carbs at that point.
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