20 Most Recent 1983 Yamaha XJ 650 - Page 6 Questions & Answers

Check to see if it has a spark quickly after it has stopped also try running it with the fuel cap off.

remove one pad and press lever slowly and see the piston move out then compress back in with a lever , view the condition of the piston/s if they are rusty ! if hard to press out then the piston/s need pressing out and cleaning and the seals checking for damage , use VERY light wet n dry paper so not to scratch the pistons as they are normally chromed ! wash off in petrol as you go ! if the chrome is pealing then replace them and the seals ! clean inside the housing also CAREFULLY !

There is not much adjustment available on this type carb. Changing the jets is one way to improve performance if necessary. If the bike is not running well get a mechanic to Synchronize the carbs. This is done with four vacuum gages and is a rather delicate but necessary adjustment for proper operation.

It is corrected properly, right? + to the wiring harness and - to ground ... right? Are you certain about the rectifier? Is the battery charged at this time?

You know a alternator cannot make power unless you first put power into it ... right? Alternators (unlike most generators) are not self exciting. If your battery is weak or "dead", the alternator cannot make electricity to charge the battery. I don't know what the rating of your alternator is. Your battery should be fully charged before you do any more tests. If you have a 1 amp charger, allow at least 10 hours for a full charge. Don't cook your battery with a big, powerful, fast charging automotive battery charger.

Good luck with your repair ... I hope you find this response helpful.

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Possibly a bad starter button.

Without knowing the year of the bike, the following link is about the best that can be done. Fuel Pump schematic Yamaha Xj650lj 1982

Ebay might be your best bet. If not talk to a shop. Odds are that will be extremely expensive though.

check for a vacuum leak around intake manifold or any hoses going off the intake. if you cant get at .the vacuum hoses of try pinching them and see if rpm goes down.

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Remove, disassemble and clean carburetor. Sounds like clogged jet.

Breather hose

From the top of the engine, it's probably a breather hose.Look around your air cleaner for a connector to plug it into.

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?"

need to check to see if losing fuel or spark

The spark plug wires on your bike connect the same way as on most cars. Pull the insulated boot directly away from the spark plug. Just make sure you pull on the insulated boot, and not on the wire.

when you spin the front wheel with the cable removed, does the spindle turn in the speedo drive?If not: 1) Check that drive is fitted correctly, often there is a washer or spacer that if omitted can stop the drive from working2) try another drive unit in the wheel.I think that option 1 is most likely

Remove plug and do compassion test. May have to replace rings.

check the rrelay for the instruments and especially the lights

Your battery is low. You should have 12V or more on a good battery. If you have another battery or a way to run jumper cables try it to confirm.