Question about Yamaha YZF 600 R thunder cat Motorcycles
2 and 3 center cyclinders not firing cleaned carbs replaced the coil and installed new plugs but pipes still cold until i held my hand over the mouth of those carbs seem to kick them in and pipes got hot for a few seconds any suggestions?
Carbs need to be torn down and cleaned or jets ajusted--ur hand acts like a choke drawing more gas
Posted on Feb 14, 2014
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Posted on Jan 02, 2017
SOURCE: Rear cylinder not firing
The first thing I would do is replace the spark plugs again. You can foul a plug and it will cause you more problems than you can ever imagine. I see you have done all the logical things that I would recommend but I did not see you have replaced the plugs after the 200 miles. You would be surprised at how many times a $2.00 part can cause fits beyond belief.
Posted on Dec 08, 2008
Hi and welcome to FixYa,
With the indulgence of craigjamesbt...
A few additional ideas to consider:
Good luck and thank you for using FixYa.
Posted on Apr 27, 2009
take the plus out and leave them in the boots lay them on a ground (bolt or the frame etc..) to make sure that there is no fire
Posted on Jun 23, 2009
fuel flow to cold pipe cylinder may be stopped with trash or sticky float.Resistor in plug wire for the one not firing could be bad. Try changing coil from one that is firing to the one thats not,see if that pipe gets hot or does the same thing still happen. coil ,plug wire, or fuel would be my primary focus.
Posted on Apr 20, 2010
This is not the news you probably want to hear but backfiring thru the carbs when you have good spark can be one of 2 things... either the valves are sticking / not closing properly due to carbon or the cam timing has shifted from the original position.
It would be best to do a compression test. You should have a minimum of 100 PSIG for an engine with major problems and up to 150 for a healthy engine. If you can not get 100 PSIG then it will be time for some serious engine service.
There is a possibility of the kill switch wire in the handle bar grip grounding under the grip to the handlebar but, since you said you have killer spark I doubt this is your problem.
Thanks for using FixYa.
Posted on Jun 10, 2010
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