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Somebody Blew It 27 Mar 2024 04:16 #896948

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The base circle on all stock cams is the same.
The wider measurements you are encountering are the quietening ramps.
This is why you should take clearance measurements with the lobe pointing directly away ( 180 degrees )  from the shim to ensure you are fully on the base circle and not on the ramp.
Especially with higher lift / performance profiles.
You should also note that the upper clearance spec for the unitrack cams is 0.18mm so aim for that when shimming.
AIR CORRECTOR JETS FOR VM CARBS AND ETHANOL RESISTANT VITON CHOKE PLUNGER SEAL REPLACMENT FOR ALL CLASSIC AND MODERN MOTORCYCLE CARBURETTORS
kzrider.com/forum/23-for-sale/611992-air-corrector-jets-





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Somebody Blew It 27 Mar 2024 08:33 #896959

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Thank you zed1015 for sharing that tasty morsel of knowledge.
Your fine comments bring much needed clarity to my blurry visualizations, and greatly enhance my forum participation experience.

1982 KZ1100-A2

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Somebody Blew It 27 Mar 2024 11:31 #896965

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The base circle on all stock cams is the same.
The wider measurements you are encountering are the quietening ramps.
This is why you should take clearance measurements with the lobe pointing directly away ( 180 degrees )  from the shim to ensure you are fully on the base circle and not on the ramp.
Especially with higher lift / performance profiles.
You should also note that the upper clearance spec for the unitrack cams is 0.18mm so aim for that when shimming.
 
Makes sense that the best lobe-shim engagement spot would be immediately past the quietening ramp, and no distance before or some point further down the lobe surface. 

Schumann was provided lash measurements of the head with it's standard-lift stock cams, along with valve tipping adjustments needed so I could utilize 2.50 shims throughout. 
Subsequently I purchased the set of Unitrak cams, and that list was revised to favor my wrong interpretation of the base circle measurement (being 0.10mm bigger) duh!  My request was that 0.05mm additional tip material be removed to maintain my shim preference.

If the lash ends up 0.15mm +/- then I will be a very happy man.





 
1982 KZ1100-A2

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Somebody Blew It 27 Mar 2024 12:05 #896969

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Might it of been an idea to send your head man the cams (or is he too far away 
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Somebody Blew It 27 Mar 2024 12:25 #896971

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The polished up ZN buckets will be reused in their original locations.

 


1982 KZ1100-A2

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Somebody Blew It 27 Mar 2024 12:47 #896972

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Might it of been an idea to send your head man the cams (or is he too far away 
 

Chris Schumann heads are shipped with no cams, caps, or shim buckets.  He said those are not needed for his rebuild process, which maintain tip heights unless otherwise requested...

I thought that was "different" at first.  The program works...and it reduces the shipping costs as well. 

BIG Win-Wins! in my FSM...


1982 KZ1100-A2

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Somebody Blew It 27 Mar 2024 15:49 #896982

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Chris Schumann heads are shipped with no cams, caps, or shim buckets.  He said those are not needed for his rebuild process, which maintain tip heights unless otherwise requested...

I thought that was "different" at first.  The program works...and it reduces the shipping costs as well. 

BIG Win-Wins! in my FSM...


No need for the buckets and cams etc when doing a valve job.
Just aim to get as close as possible to 37.2mm on the stem heights to get in the upper end of the shim range.
AIR CORRECTOR JETS FOR VM CARBS AND ETHANOL RESISTANT VITON CHOKE PLUNGER SEAL REPLACMENT FOR ALL CLASSIC AND MODERN MOTORCYCLE CARBURETTORS
kzrider.com/forum/23-for-sale/611992-air-corrector-jets-





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Somebody Blew It 28 Mar 2024 06:59 #897008

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The base circle and the measurable diameter of this 300° duration camshaft lobe are not one and the same.





The drawn lines show where the true base circle to lobe transition points are





 
Please consider the above information and dimensions below to be revised and corrected...

1982 KZ1100-A2

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Somebody Blew It 29 Mar 2024 14:33 #897052

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Checking out the head work...




1982 KZ1100-A2

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Somebody Blew It 29 Mar 2024 15:02 #897053

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Yup it's that close. 
Steve

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Somebody Blew It 29 Mar 2024 15:38 #897056

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Very close!




Out with old...







Done with that!







1982 KZ1100-A2

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Somebody Blew It 03 Apr 2024 08:12 #897214

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Done with that!  
So I thought...Those two inserts were flush with the head surface, and that was no good. 



See: kzrider.com/forum/2-engine/620085-stripp...mesert-repair#897212


Fixed that, and cleaned things up:




1982 KZ1100-A2

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