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Cam chain weird nose 07 Oct 2021 06:02 #856292

  • Jim369bikes
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Hello folks,

Got a quick question, I have just rebuilt a L2 1982 KZ750 motor, have used a different rocker cover and possibly cams from a shaft drive model, can’t remember the model number of the top of my head. The issue is when manually turning the engine a straining/whining sound comes from the engine. I also have fitted a manual chain tensioner. 

what I have checked,
1-checked valve clearances and tappet bucket movement. All normal. 
2-  took cams out, dropped chain of crankshaft and rotated, no abnormal sound. So think pistons/head is ok. 

Rebuilt the head then pushed down on chain as rocker chain guide would work, adjusted tensioner then rotated, sound returned. So I think it’s the chain when under load,

1- maybe a tight part of chain straining under tension?
2- Or maybe damaged chain?  or normal for a new chain?
3- could be rocker cover guide different size as from different model 
4- cams different size, in turn effecting tension / timing?

Hopefully below video works and you can hear what I mean. I really don’t want to tear it down again to change the chain but might be the answer. 

any thoughts greatly received. 

jim 

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Cam chain weird nose 07 Oct 2021 06:04 #856293

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Video below 

IMG_4369.MOV

IMG_4369.MOV

IMG_4369.MOV

Attachments:

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Cam chain weird nose 07 Oct 2021 06:09 #856294

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I do not see a video, but my first guess would be that the tensioner is too tight.
1982 KZ1000 LTD parts donor
1981 KZ1000 LTD awaiting resurrection
2000 ZRX1100 not ridden enough

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Cam chain weird nose 07 Oct 2021 07:52 #856298

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Yea could well be the issue as have little experience in what is normal. I set timing put rocker on then tightened manual tensioner finger tight rotated 1/4 turn, finger tight, then rotated 1/4 turn.  Repeated process then locked off. 
Attachments:

    IMG_4369.MOV

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Cam chain weird nose 07 Oct 2021 10:45 #856316

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 A straining/whining sound is normal on a fresh rebuilt engine. All parts need a heat or break in cycle to set the parts positions/tolerances/conditions.
In the video you can turn the crank without to collide the valves to the piston. Your finger tight cam chain tension is ok and need to re done after the break in.
To see the video right click the attachment and save as.....

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Cam chain weird nose 07 Oct 2021 11:35 #856319

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Thanks for your advice, it does feel like there is a tight spot on the chain, could well be due to new chain and amalgamation of parts. Fingers crossed that it will bed in. 

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Cam chain weird nose 07 Oct 2021 18:02 #856337

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Isn't the valve cover supposed to be put on before it is adjusted or engine damage will result?
Steve

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Cam chain weird nose 07 Oct 2021 19:41 #856345

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Cam chain weird nose


Hmm, mine had floppy ears and a strange smile but I thought its NOSE was kinda cute...!!!      {sorry}...
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Cam chain weird nose 08 Oct 2021 09:42 #856371

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Do you mean the rocker cover? Yes that needs to be on before you can adjust the tensioner. 

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Cam chain weird nose 08 Oct 2021 09:56 #856373

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Technically valve cover, cam cover, cylinder head cover are correct. Rocker Cover not so much, no rocker arms in your specific engines. 
1976 KZ 900 A4 kzrider.com/forum/11-projects/613548-1976-kz-900-a4
1976 KZ 900 B1 LTD
1978 KZ 1000 B2 LTD
1980 KZ 750 E1
Kowledge Speaks, But Wisdom Listens.
Jimi Hendrix.
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Cam chain weird nose 08 Oct 2021 10:14 #856375

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My 69 Ford F250 has rocker covers but I call them valve covers too. 
Steve

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