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Spark knock because of ignition timing?
- The David
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First I thought, maybe its because of a lean mixture. I cleaned the carburetors and changed the rubber inlet manifolds and now the fuel/air mixture seems right according to the brownish color of the spark plugs. However, the noise did not go away.
When checking the ignition timing, the timing seems to be off for some degrees at idle and advance (about the same amount). Could this be the reason for the pinging noise? And how could I adjust the timing, as the coil plate has no slots for adjustments (should I make these)?
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- Nessism
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- Nebr_Rex
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Do not adjust your ignition timing.
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2002 ZRX1200R
81 GPz1100
79 KZ1000st daily ride
79 KZ1000mk2 prodject
78 KZ650sr
78 KZ650b
81 KZ750e
80 KZ750ltd
77 KZ400/440 cafe project
76 KZ400/440 Fuel Injected
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- The David
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The sound is very distinct at the right hand side, top engine. So if it would be the camchain the sound should come from the middle right?
Just in case I removed the cam chain tensioner to check it, but it was working properly and within spec.
I also performed a compression test, and the right cilinders compression is low, around 100 psi compared to 145 of the left cilinder, so maybe that's an indication of something. This winter I can work on the engine, but I would rather drive still for 2 months, so If it is something I can fix without an engine teardown, that would be great.
When driving, when I have the throttle stable, there is no noise, but when I open it slightly the rattle comes again, thats why I expected it to be spark knock..
I think I read somewhere that it could also be the primary chain if the chain guides are worn out or broken. Maybe I'll check that next.
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- hardrockminer
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I have several restored bikes along with a 2006 Goldwing with a sidecar. My wife has a 2019 Suzuki DR 650 for on and off road.
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- The David
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- hardrockminer
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The lower compression in one cylinder indicates a problem with rings or valves, but 100 psi should be enough to run until the season is over. Are you seeing any smoke?
I have several restored bikes along with a 2006 Goldwing with a sidecar. My wife has a 2019 Suzuki DR 650 for on and off road.
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- SWest
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- 10 22 2014
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Steve
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- The David
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hardrockminer wrote: Timing chain may be loose. Is it correctly adjusted?
The lower compression in one cylinder indicates a problem with rings or valves, but 100 psi should be enough to run until the season is over. Are you seeing any smoke?
It's an automatic adjuster which still looks ok, but maybe the spring is getting a bit weak. I should maybe check it again. And yeah, it runs still fine, even with the low compression, there is no smoke coming from the exhaust. I'm thinking of replacing the valve seals and piston rings, during the winter teardown. But for now its still ok!
SWest wrote: Does it have a counter balancer? My Honda 350 didn't have one and it ran great. I hate those things.
Steve
I think it does have a counter balancer chain, so that could be the problem. But the only way to find out is a complete teardown I guess..
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- TexasKZ
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1982 KZ1000 LTD parts donor
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- krazee1
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Mike
Former M.E. at Kawasaki Motors Manufacturing, Lincoln, NE
1966 W1 (the Z1 of 1966-50H.P. and 100mph!)
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1976 KZ900B pile O parts
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- loudhvx
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I would put a feeler down the spark plug hole and find TDC and see how much rotation of the crank you can get while the piston is stationary near TDC. Compare that with the other side. That will tell you if there is undo slop in the bearings, wristpin etc.
But the knock could be result of a broken ring causing the piston to rock in the bore under stress. That would also explain the low compression.
Maybe a leakdown test would be in order to see if the pressure escapes through the crankcase, comparing the difference with the good side.
1981 KZ550 D1 gpz.
Kz550 valve train warning.
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