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Kz900 misfire?
- Conspiracy
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My mechanic sent this video to show why he thinks a cyclinder is misfiring.
He says when he revs up a bit he can hear what sounds like a misfire in one of the cylinders. He had it connected to one of the meters to level out the carbs when he noticed.
What do you think?
Misfire
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1976 KZ900
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- Scirocco
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In my opinion motor runs to lean
Check fuel line, filter, jets, float high (clear tube test ) and vent in tank cap ( clogged = vacuum = insufficient fuel flow).
My 1975 Z 1 B 900 Project
www.kzrider.com/forum/11-projects/605133...ears-deep-sleep-mode
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Novice rider
1976 KZ900
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My 1975 Z 1 B 900 Project
www.kzrider.com/forum/11-projects/605133...ears-deep-sleep-mode
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Conspiracy wrote: I am pretty sure he checked those but will double check. Thank you
Love your avatar Conspiracy Penguin, I have the same issue which my GPZ1100, on idle - cold- it appears to be ok, but when the throttle is "slightly" open it backfires- sometimes. Previously my pilot jets were 38 (I have ZRX CV carbies) and the backfire was considerably worse - now I have 40 the backfiring is less.
I tried the idle jet mixer but could not see much difference apart from making it too rich - weird.
Opps forgot to mention, once the engine is hot there are no issues
First Permanent ride the Z1R since Dec1977 (220,000km) as of June 2015
Second permanent bike 1989 FJ1200 dyno'd 140RWH, great bike.
Third ride is now the Frankenstein 1981 GPZ1100B1, 1983 fully recon motor fitted LOVE THIS BIKE
Forth my work bike FJ1200 1989 (same type as FJ above)
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spray brake cleaner on or around the manifold, if motor rev lower you have a leak there.
spray brake cleaner in the air filter body to check motor without misfire.
sorry for my bad English, i hope you understand my explanations.
My 1975 Z 1 B 900 Project
www.kzrider.com/forum/11-projects/605133...ears-deep-sleep-mode
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- SWest
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- 10 22 2014
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Steve
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Scirocco wrote: Quick test for leaks in the intake manifold.
spray brake cleaner on or around the manifold, if motor rev lower you have a leak there.
spray brake cleaner in the air filter body to check motor without misfire.
sorry for my bad English, i hope you understand my explanations.
Good call I'll check resealing - sorry penguin for steeling your thunder
Steve, not talking for Mr Penguin, yes I've just checked them.
First Permanent ride the Z1R since Dec1977 (220,000km) as of June 2015
Second permanent bike 1989 FJ1200 dyno'd 140RWH, great bike.
Third ride is now the Frankenstein 1981 GPZ1100B1, 1983 fully recon motor fitted LOVE THIS BIKE
Forth my work bike FJ1200 1989 (same type as FJ above)
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Conspiracy wrote: Good day,
My mechanic sent this video to show why he thinks a cylinder is misfiring.
He says when he revs up a bit he can hear what sounds like a misfire in one of the cylinders. He had it connected to one of the meters to level out the carbs when he noticed.
What do you think?
Misfire
A lot of things can cause a misfire. Plugs, bad wire, cap, clogged jets, tight valves, etc. OR a carb way out of sync. Is he using a set of gauges or just one?
Steve
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1976 KZ900
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1977 KZ650-C1 Original Owner - Stock (with additional invisible FIAMM horn)
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