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Old 09-25-2008, 05:34 PM   #1 (permalink)
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Post 02 MXZ 800 high idle issue

2002 mxz 800. idles around 3k rpm. carb boots good, no vacuum leaks, cant pin point problem area. any suggestions
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Old 09-25-2008, 05:54 PM   #2 (permalink)
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What exactly have you done to pin point the leaks?
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Old 09-25-2008, 06:02 PM   #3 (permalink)
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Is there 1/8" of cable play in the throttle lever? The cable may be too tight, keeping the slides too high.
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Old 09-25-2008, 09:08 PM   #4 (permalink)
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Mine does something similar. After running at high rpm it doesn't go down to a low idle easily. Like to hover at 3k more. If I fiddle the choke a little I can get it down to idle and it'll stay there. Not as common when warm.
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Old 09-28-2008, 09:32 PM   #5 (permalink)
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I can't find the tech sheet,but there was an issue with airflow inside the carb bypassing the flat slide and causing higher idle speed.Sorry,I can't remember what the fix was.I'll keep looking.
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Old 10-01-2008, 04:27 PM   #6 (permalink)
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Quote:
Originally Posted by smallengineguy View Post
Is there 1/8" of cable play in the throttle lever? The cable may be too tight, keeping the slides too high.
Thanks. cable adjustment helped!
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Old 10-01-2008, 09:21 PM   #7 (permalink)
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Old 09-20-2009, 02:50 PM   #8 (permalink)
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2002 mxz 800

I have the same problems.I have at less 1/8 of space there maybe more but if i put her on 1/2 choke she will idle down but as soon as you give her a little gas and let go she shoots right back yup to 3000 rpm.just wondering if you guys know what to do.I have a 2002 mxz renegade 800.
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Old 09-20-2009, 06:08 PM   #9 (permalink)
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Lots of times, a high idle is an indication of a lean condition in the pilot jet circuit. Sometimes installing the next size bigger pilot jet helps, as does turning the air screws in a bit (or fuel screws out, depending on model of carb...)

If it comes down with the choke applied, and you have ruled out air leaks in the carb boots and a leaky crankcase seal, try the air screws...
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Old 09-20-2009, 08:28 PM   #10 (permalink)
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How would ou check for a leaky boot or crankcase seal.do you have to take the carbs off to adjust the air screws
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