Question about 2002 Yamaha V Star 1100 Classic

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Won't idle smooth-#2 cylynder back fires while idleing

The bike has not been used for a while. it has new plugs. took it for a ride about a month ago and it would just stop running, i would pull off the road and it would start back up. now when I try to start it, it will not idle smoothly and back fires from the rear cylinder. is it fuel, electrical or timing?

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Could be the carb or EFI system , a sticking valve or check fuel filter,try changing the oil and add some marvel mystery oil to it then start and let idle.you should also check your plugs and wires again to make sure one isnt loose and you didnt foul a plug

Posted on Oct 03, 2009

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Don't let your bike just sit there idling. The choke circuit is needed for initial start-up.
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You have done a good job ... pat yourself on the back ... following that, go get some injector cleaner and add an appropriate amount to your tank and go for a ride. Do what ever you need to do to keep from pushing it home. I think this will solve your trouble.

May I recommend a fuel stabilizer for your fuel for future periods of time when you will not be riding? StaBil is a good brand but there are others as well.

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To balance your carbs you need 4 vacuum guages. You will plug these into the carbs (1 per carb) by removing the screw in the manifold just above where each carb attaches to the engine. Set your idle screw to get the engine running at about 2-2500 rpm and adjust the butterfly position till you get all the vacuum gauges at the same reading (IE max that you can get for the pot).

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