Question about Yamaha XJ 650 Motorcycles

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I have an 1982 xj650 midnight maxim. This bike has been diagnosed and even taken in to a shop. The bike would run great for a time then die & not restart for a period of time. I right away thought well it has got to be electrical so I bought a new cdi box & also two new sets of coils. NO BUENO, same scenario run for a bit then dies. When taken to a nearby motorcycle shop for a diagnosis & repair. The mechanic told me that the carbs needed to be cleaned. So he cleaned them & the bike would start right up & drive around great. After driving it a good while it would die & not start up for another 5 to 10 min or so. It will turn over then backfire but not start. I do think for whatever reason it takes longer for the bike to restart now then months ago when I got it serviced. The bike has had the tank resealed prior too the carb cleaning. I spoke with a mechanic today who thought that there may be a small hole in 1 of the floats. So I took the floats out & put them in a coffe can filled with gas to see if they would hold gas. No noticable hole in any of the floats. I have also got a lead on something called the pickups,supposedly one of them could be going out idk. If you can take this all in & come up with a good solution & probable cause I would be so glad I have allready spent more on this bike than it is worth.

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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.

God Speed

Posted on Oct 04, 2013

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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

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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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I have a problem with the idle speed when my 1982 XJ650 heats up. When I engage the clutch, the RPMs shoot up to about 3000-3500 and even higher. When the bike is cold, the idle is perfect. Once I ride...


Hope this doesn't reach you too late. These bikes take some time to fully warm up.

You can adjust the idle down by turning the knob between the #2 and #3 carburetors counterclockwise until you reach 1050rpm. Wear a glove or you will burn your hand!

Ride the bike some more, and see if the idle stabilizes. If not, you may have a vacuum leak somewhere.

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There are several wiring diagrams available on this thread:

There are actually a few sub-models of the XJ750, so be sure you look carefully, but it looks like the oil indicator wire is "B/r" on all of them. That most likely means black with a red line. is a great source of information for the maxims and secas from the 80's, but it is not a substitute for a good shop manual. If you are planning to do some work on your own bike, a shop manual will be a worthwhile investment. the Haynes manuals are great, and you can usually find a new one on ebay for around $25. The best part about those shop manuals is that they cover a few years and models of similar bikes, so you may even be able to reuse it for future projects.

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Aug 22, 2010 | 1982 Yamaha XJ 650

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1982 yamaha xj650 starting

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Apr 17, 2010 | 1982 Yamaha XJ 650

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plz visit this site
theres a lot of info there!
My bike is xj750A ' 81

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No clutch

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Use engine oil designed for motorcycles.
Solution: Buy and Engine flush, pour it to your crankshaft, run the engine for 5 minutes (idle) then drain. Replace with new motorcycle oil.

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