Question about Yamaha XJ 650 Motorcycles
I got you Gavin,
My father and I tore my whole 1982 Yamaha xj650 (highly modified, of course) apart after the same problem. tried everything for weeks. would run for twenty minutes then reps would sputter and kill after 20 - 40 min on the bike. I guess I did get a lot of good new parts on Trudy though anyways.
It wasn\'t until we talked to my uncle ( a huge bike nut) that we finally figured it out.....
You have to replace all those black rubber boots that go into the carburetor and the seals for good measure. I wish I could tell ya it was a somewhat cheap endeavor, but it won\'t break the bank either. I think ~$450.00 everything for all four on bike bandit for everything.
The things is, over time this rubber starts to break down on older bikes and cracks and splits. When that happens you get microscopic slits in the rubber that cannot be seen by light or water for that matter really that suck in air.
Which is why I tell you replace all since you can\'t really tell and in general they are old. If you\'re handy you can do it yourself or bring to shop. make sure that they get that seal on there solid.
Been riding it hard for 2 seasons and ran the gas all out once and burned up everything in the carbs and she is still a champ.
Run a good octane and always, always, always use SEAFOAM to keep carbs clean. Still starts right up after sitting in my garage after a cold MN winter.
The bike is great. good commuter or joyride and older Asian import bikes run forever if ya run good liquids.
Posted on Oct 04, 2013
Its your puckup coils i have the same bike that had the same problem. when the pickup coils are bad and heat up they stop working. so they need replaced. when the bike is hot it will most likely die and not start back up till like 20 mins. then it will start again and run for like 10 mins just to shut off leaving u set for 20 mins again. and thats all cause of bad pickup coils
Posted on Sep 17, 2013
Look its really hard to tell without seeing the bike when it happens, and if im wrong just repost the question, but it sounds like a problem with the vacumn fuel tap.When it stops can you place the fuel tap on pri between on and reserve and see if it makes a difference
a hole in one float would not stop a multi cylnder bike, it would just make that carb flood
probably not the pick up coils as there are two and they wont fail together, and then come good again
Thanks for the extended question, much better than "my bike stopped whats wrong?"
Posted on Jun 03, 2010
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Posted on Jan 02, 2017
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