86 600 ninja loses cylinder when warm - Sportbikes.net
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post #1 of 5 (permalink) Old 02-01-2008, 05:01 PM Thread Starter
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86 600 ninja loses cylinder when warm

Hey guys, this is my first post in a while. I'm trying to bring my bike back from the dead (got hit by a car last year). It starts, runs great, and pulls as hard as ever until it gets up to operating temperature. Then it will miss intermittently, and finally lose a cylinder. The cylinder never really comes back after this point, and it backfires once in a while. If i turn off the bike and let it cool down, it runs perfectly again. I'm going to check the valve clearance, but what does this sound like to you? thanks!
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post #2 of 5 (permalink) Old 02-01-2008, 05:31 PM
 
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Coil has a break in it, as the coils get hot they expand(windings) and lose the abilty to make spark.


Note: I'm not a mech in any shape form or fact,but I have really good guesses!
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post #3 of 5 (permalink) Old 02-01-2008, 08:18 PM
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Quote:
Originally Posted by tvetree View Post
Coil has a break in it, as the coils get hot they expand(windings) and lose the abilty to make spark.


Note: I'm not a mech in any shape form or fact,but I have really good guesses!
This makes sense if there is one cylinder per coil. If there are two cylinders per coil (most recent inline 4 engines but perhaps not the '86), then you'd lose 2 cylinders at once.

It does sound electrical though. Might also check the spark plug wires. Could one of them be loose on the plug or in bad shape? Resistance could go up with heat.

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post #4 of 5 (permalink) Old 02-01-2008, 10:43 PM Thread Starter
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cool, thanks, I'll look into that. I started my valve adjustment today, see if that does anything
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post #5 of 5 (permalink) Old 02-02-2008, 02:12 AM
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Because you say that you slowly lose the cylinder, it sounds like richness to me. Could the choke be not closing all the way on that cylinder? Look at the pistons on all the carbs, work the choke lever, and see if that cylinder's carb behaves differently. I doubt the carb internals would be off if nobody opened it up between the crash and now.
Might be helpful to check the spark plugs and see if this one cylinder has a much darker plug than the rest.

IIRC this bike is like you think, Ray, one coil for the outside cylinders and one for the inside cylinders. So for it to be electrical it would probably be the wires, and the easy test for this is to swap the leads between the problem cylinder and the good cylinder on the same coil. In case you're wondering, yes you can do this because both leads coming out of a coil fire at the same time. If the problem moves then there you go.

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