Has anyone had problems with new camshaft bearings?
- MLMG
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Re: Has anyone had problems with new camshaft bearings?
26 Jun 2023 10:28The last ones I bought, the guy said they were original K&L, but when a darker one arrived with a diameter greater than 29mm, I was already suspicious.Don´t buy shims from unkown sources, to many china clones with less surface hardness (Brinell, Vickers, Rockwell).
Ebay retro-motorcycles "99.5% positive"
When I feel like it again, I'm going to buy at the store in Germany that you recommend.
thank you so much
1977 Kawasaki KZ1000 A1
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- zed1015
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Re: Has anyone had problems with new camshaft bearings?
26 Jun 2023 11:0129.5mm shim is for Suzuki GS1000 etc.The last ones I bought, the guy said they were original K&L, but when a darker one arrived with a diameter greater than 29mm, I was already suspicious.Don´t buy shims from unkown sources, to many china clones with less surface hardness (Brinell, Vickers, Rockwell).
Ebay retro-motorcycles "99.5% positive"
When I feel like it again, I'm going to buy at the store in Germany that you recommend.
thank you so much
AIR CORRECTOR JETS FOR VM CARBS AND ETHANOL RESISTANT VITON CHOKE PLUNGER SEAL REPLACMENT FOR ALL CLASSIC AND MODERN MOTORCYCLE CARBURETTORS
www.kzrider.com/23-for-sale/611992-air-c...lide-mikunis?start=0
www.kzrider.com/23-for-sale/611992-air-c...lide-mikunis?start=0
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- MLMG
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Re: Has anyone had problems with new camshaft bearings?
11 Jul 2023 16:44
I bought shims on the website
www.tills.de
that Scirocco suggested to me.
They came in two types, one darker like the one in the image with the large name separated by a hyphen.
And others clearer identical to those sold by Z1E.
I had the engine running for two minutes and the clearer ones showed signs of wear.
The truth is that things are complicated, where do you buy original shims?
It is a pity the number of failures and discouragement that will be seen because of the scrap they sell.
They came in two types, one darker like the one in the image with the large name separated by a hyphen.
And others clearer identical to those sold by Z1E.
I had the engine running for two minutes and the clearer ones showed signs of wear.
The truth is that things are complicated, where do you buy original shims?
It is a pity the number of failures and discouragement that will be seen because of the scrap they sell.
1977 Kawasaki KZ1000 A1
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- slmjim+Z1BEBE
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Re: Has anyone had problems with new camshaft bearings?
12 Jul 2023 05:13We've never seen shims with what looks like parallel mill marks.I'm using an APE chain tensioner, I hand-tighten it very delicately.What cam chain tensioner are you using? (if the chain is too tight it will pull the cams down against the oil feed holes and could restrict flow) Have you checked clearance with plastigauge?
Also change the camshaft bearings for original Kawasaki ones.
The trees rotated freely.
youtube.com/shorts/T779pBR6w70
My thought is that if it were a lubrication problem, a bearing would already have failed.
see other similar problems in the forum.
I leave the links
kzrider.com/forum/2-engine/616881-z1r-spat-out-a-shim?start=12
kzrider.com/forum/2-engine/617690-is-my-cam-toast
kzrider.com/forum/2-engine/617435-strange-cam-lobe-wear-pattern
Of additional concern is, the large, light dot in the center of the shim that's surrounded by a darker halo, and has a feature visible through the dot's axis. That is the exact wear pattern caused by early Z1 shim buckets (PN# 12032-004) that weren't machined perfectly flat, leaving a 'navel' around which the shim would rock, leading to shims fracturing. The feature through the axis may be the beginning of a fracture.
Mama Kaw issued a recall (Svc. Bulletin SER 73 Z-13, dated 6-21-73) to replace the early Z1 shim buckets with correctly-machined items (PN# 12032-005) sans the 'navel'. See below.
We've seen old-style buckets with the 'navels, in the wild for decades; in motors, at swap meets and at independent shops in their used parts bins.
Shims with the navel 'dot' should be discarded, as microscopic fracture fatigue may have begun to develop internally. Reuse at your own risk.
Are you certain the shim buckets in your motor are factory-original to your motor, sans 'navel' ?
Good Ridin'
slmjim & Z1BEBE
A biker looks at your engine and chrome.
A Rider looks at your odometer and tags.
1973 ('72 builds) Z1 x2
1974 Z1-A x2
1975 Z1-B x2
1993 CB 750 Nighthawk x2
2009 ST1300A
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on all things Z1, Z2 and KZ900.
A Rider looks at your odometer and tags.
1973 ('72 builds) Z1 x2
1974 Z1-A x2
1975 Z1-B x2
1993 CB 750 Nighthawk x2
2009 ST1300A
www.kawasaki-z-classik.com
An enthusiast's forum focused exclusively
on all things Z1, Z2 and KZ900.
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- Wookie58
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Re: Has anyone had problems with new camshaft bearings?
12 Jul 2023 05:40
Where else could you find this level of product knowledge and expertise
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- MLMG
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Re: Has anyone had problems with new camshaft bearings?
12 Jul 2023 10:05 - 12 Jul 2023 10:06The image you refer to is not mine, it belongs to another forum member with a similar problem.We've never seen shims with what looks like parallel mill marks.I'm using an APE chain tensioner, I hand-tighten it very delicately.What cam chain tensioner are you using? (if the chain is too tight it will pull the cams down against the oil feed holes and could restrict flow) Have you checked clearance with plastigauge?
Also change the camshaft bearings for original Kawasaki ones.
The trees rotated freely.
youtube.com/shorts/T779pBR6w70
My thought is that if it were a lubrication problem, a bearing would already have failed.
see other similar problems in the forum.
I leave the links
kzrider.com/forum/2-engine/616881-z1r-spat-out-a-shim?start=12
kzrider.com/forum/2-engine/617690-is-my-cam-toast
kzrider.com/forum/2-engine/617435-strange-cam-lobe-wear-pattern
Of additional concern is, the large, light dot in the center of the shim that's surrounded by a darker halo, and has a feature visible through the dot's axis. That is the exact wear pattern caused by early Z1 shim buckets (PN# 12032-004) that weren't machined perfectly flat, leaving a 'navel' around which the shim would rock, leading to shims fracturing. The feature through the axis may be the beginning of a fracture.
Mama Kaw issued a recall (Svc. Bulletin SER 73 Z-13, dated 6-21-73) to replace the early Z1 shim buckets with correctly-machined items (PN# 12032-005) sans the 'navel'. See below.
We've seen old-style buckets with the 'navels, in the wild for decades; in motors, at swap meets and at independent shops in their used parts bins.
Shims with the navel 'dot' should be discarded, as microscopic fracture fatigue may have begun to develop internally. Reuse at your own risk.
Are you certain the shim buckets in your motor are factory-original to your motor, sans 'navel' ?
Good Ridin'
slmjim & Z1BEBE
My engine uses buckets without a navel.
The image below does belong to the shims of my engine.
I already look like a collector.
1977 Kawasaki KZ1000 A1
Last edit: 12 Jul 2023 10:06 by MLMG.
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Re: Has anyone had problems with new camshaft bearings?
12 Jul 2023 15:59Completely agree, that was the reason I suggested the "marking dye" it should show which part of the lobe is contacting the shim and also if that rotation is smooth (there will be "skip" marks in the blue if not) Just my opinionThe circular wear marks shows a rotating bucket/valve/shim.
In my opinion the cam lob surface/profil is the master problem. Pics would be helpful.
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- MLMG
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Re: Has anyone had problems with new camshaft bearings?
13 Jul 2023 08:58
Hello everyone.
The problem seems to have been solved, at least for now.
I could not leave the gaps as I wanted but worse is nothing.
After many tests and anger this is the conclusion.
The shim with the denomination in the center marked with an X is junk.
I have to mention that the guys at www.tills.de refunded my money after I reported the problem to them. It would be good to alert other sellers.
The problem seems to have been solved, at least for now.
I could not leave the gaps as I wanted but worse is nothing.
After many tests and anger this is the conclusion.
The shim with the denomination in the center marked with an X is junk.
I have to mention that the guys at www.tills.de refunded my money after I reported the problem to them. It would be good to alert other sellers.
1977 Kawasaki KZ1000 A1
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