Question about 1983 Yamaha XJ 650

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Battery light on and firing on three cylinders

I just bought a 1983 Yamaha Seca 750 or xj750. The bike has been sitting for a year before I bought it. The battery had a little life in it but not enough to turn it over very fast. I power washed all the dust off and then parked it in my garage for 24 hours with trickle charge on it. I just put some fresh gas in it and it started fairly quick but seem slugish when reving it. I felt the exhaust pipes and three are hot and the one on the far left is cold. I also have a warning light on the instrument cluster that says the battery is not being charged. Any things that are common for these problems or am I in a search and check. I checked for spark and it does not spark. is there separate coils for each cylinder. I also checked fuses under seat all look good. any help is appreciated
thanks

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First the bike was sitting because the owner left it sitting at storage unit and did not pay bill. New plugs and little running time for new gas to get through system took care of running on three cylinders bike now runs and starts perfect although I don't have the plates to be able to run it on the road yet. The battery holds a charge fine but I have a battery light on. I checked voltage at battery not running 12.27 then running idle 14.2 then at 2000 rpms or so 15.3 seems high to me so I bought a used regulator on ebay (cheap $10) put in and now idle 13.7 and 2000 rpms 14.5 but I still have a battery light on. Is the regulator still bad or should I be looking for something else?

Posted on Jun 11, 2009

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Ah the old 5G2 nice bike.

if sat around for a year the battery will be shot, so it will not take a charge or hold it, that may be why the warning light.

after a year idle the carb jets will gunge up,

might you have no spark because the battery is so flat?

a year laid up... why.? did it have a fault then? carb diaphragms don't like being laid up, nor carb slides, one may be stuck in the old petrol residue.

think I'd be tempted to try a new battery, and if not charging, the regulator probably packed up, beware though, a shot regulator can feed ac through to the battery rather than DC, and it will bust your new battery. loads of people fall for that one.

Posted on May 10, 2009

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