Question about Yamaha XJ 700 X Maxim Motorcycles
Motor seems to run smooth but the 4th cylinder is not firing. Exhaust cool to touch. We have spark and appears to be getting fuel
Posted by Anonymous on
Hi, Anonymous for this situation I would call my local dealer or reputable shop's service/parts department and inquire about any possible quick fix, answers, or parts inquiry. For more information about your issue and valuable "FREE" downloads that you will need please click on the links below. Good luck and have a nice day.
1985 xj700 runs on 2 cylinders
Inner cylinders don fire
Yamaha XJ700N Service Manual
OEM parts for Yamaha
Posted on Jun 27, 2016
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Posted on Jan 02, 2017
Hi and welcome to FixYa,
With the indulgence of craigjamesbt...
A few additional ideas to consider:
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Posted on Apr 27, 2009
Are you saying that 2 & 4 got gas with external tank but not with gas tank? If so something else has happened ,if gas is getting to the carb it cannot by-pass 2 to get to 1. Take the tank back off ,connect to external, again. See what happens.
Posted on Sep 11, 2009
If the spark appears to be weak only for the two front cylinders, then I would suggest checking the electrical connections for the ignition coils.
If the spark for the other two cylinders looks the same (yellow), then I'd suggest checking the compression on the non-functioning cylinders. A compression reading of 140~160PSI is what you're looking for. Low compression indicates internal engine damage - or could be from something relatively simple - like insufficient valve tappet clearance.
If the bike has been sitting for a long period of time, it could be that the carburetors are plugged up with fuel varnish. This can cause some cylinders to not run. A complete carb disassembly and clean-out will be needed.
Posted on Oct 23, 2009
Testimonial: "thanks for that feed back . there is plenty of fuel and compression is non existant on front left and 80 psi on front right,I suspect cam wear????"
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