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Post by akirasan on Oct 18, 2010 20:53:32 GMT
Bike is ticking over roughly. I have changed or checked all ignition parts but no 1 cylinder does not fire unless reved. It runs great but tickover is rough and pops a bit. With the plug out the spark jumps about. I am stumped any ideas? The bike is a 1fn 1986
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Post by Graham on Oct 18, 2010 22:37:36 GMT
Have you checked for a spark at tick over? I would be inclined to suspect a fuel problem with those symptoms.
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Post by akirasan on Oct 19, 2010 6:30:38 GMT
Spark is weak and jumps at tickover. When i take the plug out it is slightly wet. I have a lot of experience with fz's but this has got me stumped
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Post by tomster on Oct 19, 2010 16:55:12 GMT
Might be a valve without clearance so you're not getting compression?
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Post by akirasan on Oct 19, 2010 17:48:16 GMT
So why the poor spark?? That is why I think it is electrical I am swapping 2-3 coil with 1-3 to see if it works.
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Post by tomster on Oct 19, 2010 19:52:49 GMT
How much different is it than the other sparks when you take the plugs out?
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Post by akirasan on Oct 20, 2010 5:57:43 GMT
OK I have changed everything electrical to do with the ignition, an still the spark is waeker than the others and jumps about on the plug. Only no1 cylinder is cool so to mt the only thing left is either the carb, which i have cleaned but will do again, or the shims need doing.
But if it is either of them why is the plug wet and there is popping as in intermitent fireing from the exhaust??
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Post by Graham on Oct 20, 2010 6:30:00 GMT
have you got another ignition box/cdi/ecu you could try?
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Post by akirasan on Oct 20, 2010 16:37:28 GMT
Got lots of spares and changed everything to do with ignition.
I will clean carbs tonight and if that does not do it will comp test and see if the shims need doing.
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