20 Most Recent 1985 Yamaha XJ 900 F Questions & Answers

i had the same problem and had a custom tank made coast a little but will never rust . made out of alloy

Look behind your taco there is a usualy a black colored cable about the size of a cigarette. Unscrew it. Its a rotating inner shield with an outer protective shield. Verify if the rod is still present and then start your engine. If the rod is spinning you need a taco. If not follow the cable. Its plugged on top of your valve cover. Unplug it from your engine start it again and verify if its rotating. If yes then you need a new inner cable. If not you should take it to a restauration shop cuz they will need to remove the valve cover to see whats going on. sorry for my bad english

I think there is a crack in spark plug wire and its jumping spark check for that or it might be timeing but check the wires first

if you not getting compression you might have to replace the piston rings which means a top end rebuild

Hi I dont have the exact resistances for the pick ups but a kawa around the same era is 400-500 ohms and I suspect the xj shoud be similar.
It is unlikely both pick ups have failed, but they will both need similar resistances to each other, and infinate resistance to ground.
You can somtimes check by touching a screwdriver to them to set off a spark, but as you have no spark to either coil , this wont help in your case.
It sounds like a power supply problem as they both dont work. Check the throttle kill switch, and the ignition switch. When the key is turned off, it switches a wire to ground the same as a kill switch, to stop the motor, so it may have an internal problem

could have an air leak in the carb boots or bad air fuel mixture. check the spark plugs, if they're black system is too rich. if they're white, they're lean. either have an air leak going to the cars or just need adjusting. also inspect your air filter.

try swopping over the plugs .it may be a pl;ug breaking down.And check you have fuel getting to the non firing cylinder.

Please visit this site www.xjbikes.com and contact chacal.

Try the yamaha XS and XJ club on the internet

If you want to see what the service manual says about it
You can download a free one at
http://www.yamaha-motor-europe.com/community/service/manuals.jsp
Good luck!

The vent line off the bottom of the bowl vents gas when the fuel valve is is opened

Try replacing the starter solenoid.

Yes and yes. Check the main fuse if nothing comes on, ie lights, horn, etc. Do not jump start a motorcycle with the truck running. This can overload the system really easily.