Question about 1983 Yamaha XJ 650

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After being parked for about one to two months, I got the motorcycle (1983 Yamaha Maxim 650cc) to start but running rough. When I last rode it, it was running fine. I cleaned the carburators and all the electrical connections. I changed spark plugs and put another set of ignition coils thinking the original went bad. It didn't do a thing. The motorcycle will keep on running if the choke is left on, but once I take the choke off, it dies. So if I ride it with the choke on, and while speeding up I take the choke off, it keeps on going. If I reduce speed getting ready to stop and pull the clutch lever, the motorcycle dies. Any suggestions?

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Put sea foam cleaner in the gas and run it

Posted on Jul 03, 2010

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Either you have a intake leak or plugged idle jets in the carb, you can check inlet leaks by spraying carb cleaner on them while the bike is running, if the idle smooths out when you spray the intake boot, that means they are leaking. the idle jets will require you to rebuild the carbs again

Posted on Nov 26, 2009

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Definitla a fuel problem, check carb mounts for cracks, next step is to rebuild cabs

Posted on Nov 18, 2009

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Greetings all. Bought an 1983 Yamaha XJ650 Maxim late last year and love it. It ran great last fall and took it on a 2500 km road trip this June and it ran great. Two days after I got back it started...


Have you changed the oil and cleaned the air filter, after the fuel tap problem.
fuel in the oil can cause this symptom. the fuel ends up in the sump when the taps fail as yours did
also check choke is not stuck open, and battery is in good condition

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unless the fuel and vacumn hoses have been mixed up

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FZR 400R Deltabox Exup. wont idle properly Howzit everyone. I have a "small" issue with my FZR 400R Deltabox Exup. So it doesn't want to idle properly(the moment I reduce the idle speed to any point below 3000rpm it continues to drop and dies) and also revving the bike it bogs around 6000rpm doesn't go any higher. When restricting the airflow through the airbox it revs better(all the way to 14k rpm) but still doesn't want to idle as the revs then hang on it's way down. I suspected this was all caused by an air leak somewhere, sprayed some quick start on the boots between the carbs and the intake as well as between the airbox and the carbs with no jump in the revs. Nevertheless I sealed the boots just to make sure they aren't the problem. I then stripped the carb and cleaned it properly, put everything back together, sorted out their syncing and reset the mixture screws to 3.5 turns out(which sounds a bit far out, but thats what the manual said-since then I've tried everything from 0.5 to 4 turns out with no significant effect). Then the cylinder started acting up(not firings- a different cylinder about every third time the bike was started) I then replaced the spark plugs with new ones(NGK cr9ek as per the manual) after that cylinder 1,2 and 3 was firing, but 4 was still dead. I Replaced the coil, leads and caps, still not firing. I checked the compression, which was fine, I checked the valve clearance (cylinder 4 the one intake valve was way out of spec, so i replaced the shim), still not firing. I've got no idea what else could be the problem or what to check next. PS. When i pulled the spark plugs(both new and old) they where burnt black so I'm not sure if my jetting could be out of spec perhaps?

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