Question about 1981 Yamaha XJ 650
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.
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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