Question about 1981 Yamaha XJ 650

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Flaot setting for 81 yamaha 650 maxim (4 ea.)

I neet to know the settings for the carb. floats on a 1981 yamaha 650 maxim 4 cyl.

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  • nvfrog May 30, 2009

    i really apreciate your help! thank you

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# 1carb left 0.04+or-0.04 inches mm 1.0+or-1.0 # 2 carb right 0.08+or-0.04 2.0+or-1.0 hope this gets you there

Posted on May 30, 2009

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1981 yamaha maxim 650


Hi, Anonymous for this situation I would call my local dealer or reputable shop's service/parts department and inquire about any possible quick fix, answers, or parts inquiry. 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, Anonymous start with 1 1/2 turns out then you will need a vacuum board or 4 vacuum gauges to sync all four.
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Just rebuilt the carbs on my 81 650 midnight maxim and it will run great for a while and then the plugs will turn black and quit running. Seems to be getting to much gas and fowling the plugs. Thanks for...


Sounds like either sticking float needles or incorrect float height setting. If you replaced the float needles with after market ones the setting may need altering. Not a Yam expert, so you will need to consult your manual for the correct height.

Oct 09, 2010 | 1981 Yamaha XJ 650

1 Answer

Looking for float setting for 1981 yamaha 650 maxim


You would have to buy a service manual for that bike it will tell you all the carb settings in it.

Jul 29, 2010 | 1981 Yamaha XJ 650

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I have an 81 yamaha 650 maxim that will only idle with the choke on


WELL ITS SOUND LIKE YOU HAVE CLOGED JET IN CARB OR CACUME LEAK AT THE CARB BOOT NEED TO CLEAN CARB IF BOOTS OK

Mar 16, 2010 | 1981 Yamaha XJ 650

1 Answer

Need float setting instruction for 82 550 maxim Have cleaned and have new carb kits


turn where floats is hanging down and adjust to where the are hanging 17/32nds turn carb upside down and mesure the top of the flaot and be sue=re it is 1/4 inch lower than the carb flaot bowels.

Feb 05, 2010 | 1982 Yamaha XZ 550

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81 xj650lh midnight maxim black exhaust, sooty plugs keep fouling


hi,fairly common problem with modified exhaust,start with the pilot screws,turn right in untill the screws are firm then back out 1 and 3/4 turns,this is a fairly standard rule of thumb that will get most things going,as far as the jets go,the original size would be a good starting point,but you should only need to go up 10-15 sizes to compensate for the exhaust mods(ie stock might be 127 may need to go to138 or 140 etc),the other thing that i would recommend is getting hold of a set of damped carb balancers these will enable you to get the mixtures and carb balance dead right,they are relitively cheap and easy to use and will have paid for themselves the first time you use them.(i regularly get 4-8 sometimes 10-11 extra hp over stock by tuning the carbs up properly).hope this helps

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1 Answer

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


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

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1 Answer

1981 midnight maxim 650


You need to replace your floats in carbs, problem solved

Apr 25, 2009 | 1981 Yamaha XJ 650

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