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Workshop => Carburetor, Intake, and Exhaust => Topic started by: yugyagz on July 07, 2016, 06:42:53 PM

Title: High idle still.
Post by: yugyagz on July 07, 2016, 06:42:53 PM

I have a 39mm keihin. It has 170 main. 600 feet above sea level. Was missing idle adjusting screw so I purchased one and it still idles super high when I start quad. Doesn't matter where I have idle adjuster. Same idle. I've cleaned carb. Reset air screw. Seems that when I put I'm gear it drops down. After I run a bit it settles. Any help?



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Title: High idle still.
Post by: yugyagz on July 07, 2016, 06:45:17 PM

Needle is middle clip forgot that. I just don't know what else to check. Maybe not even carb issue? I haven't done a leak down and know I need to.

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Title: High idle still.
Post by: thesmith87250r on July 07, 2016, 08:29:28 PM

Is the cable adjusted so the slide sits as low as it can in the carb ?

Title: High idle still.
Post by: yugyagz on July 07, 2016, 08:57:13 PM

I do not know. But will check. Thank you. How do I adjust it?

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Title: High idle still.
Post by: yugyagz on July 07, 2016, 09:01:17 PM

Just adjusting the cable itself by the thumb

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Title: High idle still.
Post by: thesmith87250r on July 07, 2016, 10:28:29 PM

Yep . Adjust it so there is a lil slack in the cable. An adjust the idle screw out .then start over adjusting the idle

Title: High idle still.
Post by: broken1 on July 08, 2016, 12:16:03 AM

Your PWK probably has an adjuster in the top of the cap as well.

Title: High idle still.
Post by: 2ndmoto on July 08, 2016, 02:14:44 AM

Possible reasons for high idle. Air leak, improperly adjusted cable, too small of pilot jet

Title: High idle still.
Post by: yugyagz on July 08, 2016, 05:18:55 AM

Are you guys talking air leak on carb itself?

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Title: High idle still.
Post by: Skeans1 on July 08, 2016, 10:17:36 AM

Quote from: yugyagz;68633

Are you guys talking air leak on carb itself?

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Nope the motor

Title: High idle still.
Post by: yugyagz on July 08, 2016, 10:26:09 AM

Okay so I'll do leak down test and go from there

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Title: High idle still.
Post by: The_Steve_Man on July 08, 2016, 11:04:45 AM

You can turn your air screw out to see if the idle goes down. If it does, then your pilot is too small.

Title: High idle still.
Post by: fearlessfred on July 09, 2016, 05:14:44 PM

Quote from: The_Steve_Man;68644

You can turn your air screw out to see if the idle goes down. If it does, then your pilot is too small.

Just the opposite , turning out allows for more air , you would be correct on a four stroke carb .

Title: High idle still.
Post by: The_Steve_Man on July 09, 2016, 11:28:16 PM

Quote from: fearlessfred;68678

Just the opposite , turning out allows for more air , you would be correct on a four stroke carb .

Oops. You are correct. I knew what I meant but wrote it bassackwards.

Title: High idle still.
Post by: yugyagz on July 09, 2016, 11:32:18 PM

So I adjusted throttle cable and helped a ton. Then it seemed that when I adjusted my air screw more towards closing it was a low idle. Then it shot up like crazy fast so I shut off and moved back to wherec it was. Think I'm good now. Still trying leak down test. The plug I bought won't stopped leaking in my exhaust. Gonna try a different one tomorrow

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Title: High idle still.
Post by: dem3500 on July 11, 2016, 02:31:30 PM

when im installing a new throttle cable i always (not runnung) give it throttle the let go to see if i hear the slide hit the carb. that way i know the cable isnt holding it up off the bottom

Title: High idle still.
Post by: yugyagz on July 19, 2016, 08:28:14 AM

Went riding all weekend and quad ran so well. It was all in my throttle. Thanks guys. Idles just fine now

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