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Jumping Timing Chain
- freakinbike
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This is a 1982 GPz750, new valves, cut seats, new shims, gaskets, etc (full rebuild).
1982 GPZ750, stock (for now..)
1973 VW Bus
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- turboking
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2005 Kawasaki mean streak
2000 325 H.P. mcXpress turbo Hayabusa
1979 kz 1000 mk II ATP turbo
1975 Z1 960 cc Mr. Turbo
1975 Z1 1428 big block ATP turbo
1976 Kz900 1103 cc ATP turbo
1985 GS 1150E
1983 GS 1100E
1997 Suzuki Bandit 1200S
2001 Kawasaki EX 500 Ninja
1972 Honda cb750 (836cc turbo)
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- Powerstroke_fan
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1980 kz1000B4 LTD- 1327cc 9-1 comp
Ported J model head
Psp-3x cams
RS 36s
Welded MK11 crank
Back-cut MK11 trans
MTC 2 stage lock up
Stretched 4-6 over running Hayabusa rear rim with 190 rear tire
Complete frame brace kit installed
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2014- ZX14R all stock for now
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- Cynjut
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1977 KZ-1000 A1
1982 KZ-1000 M2 Frankenbike
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- baldy110
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- freakinbike
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1982 GPZ750, stock (for now..)
1973 VW Bus
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- steell
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KD9JUR
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- 650ed
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1977 KZ650-C1 Original Owner - Stock (with additional invisible FIAMM horn)
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- freakinbike
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How do you know your cam chain is jumping after one revolution of the crank? The crank turns twice for every one cam revolution.
When completing the rotation (turning the crank by hand), the chain will be taut, then something *pops* and the chain goes very slack.
If your cam chain is jumping doesn't that mean the valve timing relative to the crank is shifting? That being the case, do you know if you have had contact between the valves and pistons? Ed
I do not know if I have had contact between the valves and pistons. As far as I know, the timing has been spot on since forever. But then again, I've only put about 1000mi of the 36000mi on the bike.
1982 GPZ750, stock (for now..)
1973 VW Bus
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- steell
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freakinbike wrote:
How do you know your cam chain is jumping after one revolution of the crank? The crank turns twice for every one cam revolution.
When completing the rotation (turning the crank by hand), the chain will be taut, then something *pops* and the chain goes very slack.
Of course it does, that's the cam going over center and the valve springs rotating the cam.
Perfectly normal
If your cam chain is jumping doesn't that mean the valve timing relative to the crank is shifting? That being the case, do you know if you have had contact between the valves and pistons? Ed
I do not know if I have had contact between the valves and pistons. As far as I know, the timing has been spot on since forever. But then again, I've only put about 1000mi of the 36000mi on the bike.
To put it simply, you're seeing problems where there are none. No experience and a little nervous maybe?
.
KD9JUR
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- 650ed
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After reading Steell's posting I re-read this thread. I now think you are not saying the cam chain is actually slipping over a tooth on the cams, but merely getting tighter and looser as the engine rotates. As Steell points out, this is normal. That is why when adjusting the manual tensioner provided on some KZ's (like my KZ650-C1) the crankshaft needs to be oriented in a specific position in order for the slack to be taken up by the tensioner before the pinch bolt it tightened. Ed
1977 KZ650-C1 Original Owner - Stock (with additional invisible FIAMM horn)
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- freakinbike
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1982 GPZ750, stock (for now..)
1973 VW Bus
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