Question about 1981 Yamaha XS 650 H

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How do I set the idle on my 1981 650 Yamaha Maxim?

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My 82 seca which should have the same carb set up as your Maxim has a thumbscrew about in the middle of the carbs. i take off the left side cover and can reach in and turn the thumbscrew. then watch the tach as you do . Mine is set at 1050 as per my factory spec. hope that helps

Posted on Jul 09, 2009

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Hi, Anonymous for this scenario you will need your service/owners manual if you can't find the first and best tool you ever bought for your Yamaha, despair not, for a mere $0 you can download another one. For more information about your issue and valuable "FREE" downloads that you will need please click on the links below. Good luck and have a nice day.
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Hi, my yamaha maxim 650 will start but will not idle off choke or stay running off it or when i give it alot of gas. could it be the petcock? or the throttle adjustment screw?


Hi, Alexmacy and the usual suspects are:
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2. Fuel filter clogged.
3. Fuel line pinched or kinked.
4. Float needle and seat sticking.
5. Float level too low.
6. Carburetor bowl vent line clogged/blocked/pinched.
7. Idle adjusting screw set too low.
8. Air/fuel mixture screw set too lean.
9. Idle port, transfer ports, slow air jet clogged.
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11. Faulty fuel pump.
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1 Answer

My bike has a rough idle and sometimes backfires.


Check the timing,If it is set right,your carb is running lean.


Please rate this a fixya.

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