Question about 1981 Yamaha XJ 650

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High rpm after doing carb kit

I did a carb kit on my 1981 Yamaha 650. Now when reving it up the rpm will stay high or very slowly come back down to normal.

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  • 101 Answers

This could be any one of a number of things. First, it could be a cable routing problem. Double check the routing and free play in the cable. Don't forget to check the free play with the handlebars turned to the locks both left and right. If you loose free play when turning the bars to the stops, add free play to the cable. Second, it could be an idle speed adjustment issue. Try turning the idle down. See if the engine speed responds to turning the idle down.
The next thing to check is proper assembly of the carbs. Double check your work and make sure they are assembled correctly.
The next thing to check would b the intake boots for air leaks. You can do this by starting the bike and letting it run, then spary contact cleaner at the rubber intake boots.If the engine speed alters either way, they are leaking and you can decide if you want to replace them or not. If you intend to keep the bike, you need to replace them.

Posted on Sep 25, 2009

Testimonial: "Thanks for your help. I found the problem, it was the intake boot."

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Posted on Jan 02, 2017

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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

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you have sticky carbs or an air leak on the inlet manefoulds take the bike right back and have words with the guy who "fixed it!" like jently grad him round the neck and bang his head onto a wall till he gets it right this time you payed good money for the fix,, go back and get it done right

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MY 650 mAXIM HAS A HIGH PITCHED WHISTLE UNDER MODERATE TO HEAVY ACCELERATION FROM ABOUT 2000 TO 4000 RPM. dO YOU HAVE ANY iDEA WHAT IT MIGHT BE? tHE INTAKE BOOTS ARE NEW. THE CLUTCH CABLE IS AT THE END OF...


do u have a haynes or clymer manual-sounds like bottom end work-berings.crank etc-many miles huh-could also be leaks in carbs-learn japonese start reading

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650 maxim keeps reving up


Plz visit this site www.xjbikes.com



Knight .(yamaha seca XJ750A 1981)

Apr 21, 2009 | 1981 Yamaha XJ 650

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