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KZ1000 Engine vibration
- 88alltrac
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I have an 81 KZ1000 LTD. 5k miles
I have a vibration that is driving me crazy. It is rpm related between about 4-5k rpms. Happens in every gear so definitely not speed related. It is just kinda a buzz. It is enough to blur the mirrors.
Here is what I have done to try to fix it.
Pulled carbs and cleaned them.
New jets.
Synched them.
New spark plugs.
New plug wires
Wired george relay mod.
Battery fully charged.
Compression checked and all is good.
Checked timing and it is dead on.
Checked for air leaks between carbs and head.
Loosened and retorqued all motor mounts to factory spec.
Checked valve clearances.
So now I dont know what else to do.
Is this normal for the KZ1000? My kz750 was so smooth.
It is driving me crazy as it is definitely noticeable.
I had put pods on and rejetted it but I think I may go back to the airbox to see if I can remedy this issue.
81 KZ1000 K1
Lincoln NE
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- 88alltrac
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Also maybe cam chain tensioner? I will look into this tomorrow.
81 KZ1000 K1
Lincoln NE
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- Samwell
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I dont have an enormous amount of time to work on this but I might try tearing the carbs apart again. Maybe I missed some small passage or something.
Also maybe cam chain tensioner? I will look into this tomorrow.
Will it do the same thing in neutral? If you rev it to 4000rpm on the centre stand do you notice the vibration? Is it something you can hear or just feel? If you can notice on the centre stand then a mechanics stethoscope might help narrow down if its top end or bottom end.
You've been pretty thorough in tuning, but its worth it to look into your cam chain and the tensioner parts. my '78 kz1000 has a small slipper blade in the front of the block that can wear prematurely. There's a lot of rubber dampers in there that age and deteriorate, they may need some attention.
hope this helps...
--
Current Rides: 2013 BMW R1200GSW, 1972 BMW R75/5
Current Project: 1978 KZ1000A2: Supercrank'd by Falicon, APE studs and nuts, Dyna Green coils, powder coated frame and fenders, Stainless brake lines, dual front discs, pods, Kerker Exhaust, 1075cc with JE pistons
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- 88alltrac
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Do these bikes just naturally buzz like that? It has such low miles I dont think anything should we worn out.
81 KZ1000 K1
Lincoln NE
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- timebomb33
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1973 z1 2-1974z1-a,2-1975z1-b dragbikes1015cc+1393cc, 1977kz1000,1978kz1000,1981kz1000j, 1997 zx-11, 2000 z12r,1428turbo nitrous pro-mod and a shit load of parts thats all for now leader sask.,CANADA
I THINK MY POWERBAND BROKE
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- 88alltrac
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81 KZ1000 K1
Lincoln NE
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- timebomb33
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1973 z1 2-1974z1-a,2-1975z1-b dragbikes1015cc+1393cc, 1977kz1000,1978kz1000,1981kz1000j, 1997 zx-11, 2000 z12r,1428turbo nitrous pro-mod and a shit load of parts thats all for now leader sask.,CANADA
I THINK MY POWERBAND BROKE
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- 88alltrac
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They do look pretty good though. Any other ideas?
You dont think it is carb related? Could I have missed some little passage or something. Would that make it vibrate at WOT?
81 KZ1000 K1
Lincoln NE
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- timebomb33
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1973 z1 2-1974z1-a,2-1975z1-b dragbikes1015cc+1393cc, 1977kz1000,1978kz1000,1981kz1000j, 1997 zx-11, 2000 z12r,1428turbo nitrous pro-mod and a shit load of parts thats all for now leader sask.,CANADA
I THINK MY POWERBAND BROKE
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- 88alltrac
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Those rubber mounts are $20 a piece so I want to make sure that is the problem before I fork out the dough. I am a poor college student so I cant just keep throwing money at this.
81 KZ1000 K1
Lincoln NE
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- keith1
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- kzz1p
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- One Test Is Worth A Thousand Expert Opinions!
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