Dealers suggestions are trade in, change gas again from 91 to 89 and Chevron only,
You need a good mechanic or a do-it-yourself carburetor complete removal and cleaning. It will run like new, because it still is. You need to remove the gas tank and flush and debree out of it from storage. Install a new fuel filter. I would not be concerned about valve lash, it's too soon. I have never done a carb job on that model, but your piolet jets, including the jet itself and mixture screw need cleaning. If you decide to take it on, do plenty of research online. Buy a Yamaha service manual and a gallon of Berryman carb cleaner with a basket. It will work. Buy all Yamaha OEM parts because you do not understand how to mix and match aftermarket kits. Use Partzilla to order parts, there reasonable and have a parts diagram to help you order online. OEM parts are better and will last. Learn how to dry set the floats before assembly, that will probably not be in the Yamaha manual. When you get the bike back running right put .5OZ of Marvel Mystery oil per gallon in your 87-octane gasoline. Use it in every tank. If you store the bike for long periods drain all the gas out of the tank and carb. It will not matter if you use ethanol gas, but it defiantly goes bad faster. Cut you petcock off after each ride and allow the engine to run out of gas before parking. The Marvel will coat everything in oil for storage and 15 years later when you decide to ride you will. If that bike has been in dry storage, it is still new. Hope that will help.
Time to inspect valve train lash, too tight of adjustment will allow compression leakage.
SOURCE: carb problems
if & when you do get it running again, does the bike have a petcock at the gas tank? if it does, when the bike is running before you are about to park it for 2 weeks, turn the petcock off and let the bike die on its own (from fuel starvation). this will ensure there is (almost) no gas in the carb to cause any gumming. you can drain the little bit that is left with the carb bowl drain screw. then when you're ready to ride again, simply turn the petcock on, wait a few seconds for the carb bowl to fill, then hit the start button.
SOURCE: engine idles fine, stalls soon as its given gas
Hi there!
Open up the carb and clean the jets with pressurized air. I also suspect water on the carburetor reservoir, before opening the carb, drain it first then run. Also, make sure the plugs are clean. Pull on the choke when twisting the accelerator, if it accelerates well, then warm the beast at normal temperature first before twisting the throttle hard again.
hope this helps-
levibit-
SOURCE: Yamaha v star 650 runs with choke on only
That is the problem,You need to clean the carb jets and get the gum out of the bowl.
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