Valve clearances on a modded engine
- Sorf
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Valve clearances on a modded engine
15 Dec 2012 20:19 - 15 Dec 2012 20:20
Hi all,
I'm planning on swapping out my chromed cam cover for a polished one and intend to do clearances while it's off, but have a question regarding that.
The motor in my Z1-A is modded, but I don't really know the extent of things as it's never been fully dismantled since I've owned it.
Last time I had the cam cover off though, I ran a dial gauge over the cam lobes and from memory the total lift was 10.2mm (or so). The cover has also been "cleared" for that reason.
So would I be looking for clearances as per an original motor or are they likely to be different for the bigger cam?
I'm planning on swapping out my chromed cam cover for a polished one and intend to do clearances while it's off, but have a question regarding that.
The motor in my Z1-A is modded, but I don't really know the extent of things as it's never been fully dismantled since I've owned it.
Last time I had the cam cover off though, I ran a dial gauge over the cam lobes and from memory the total lift was 10.2mm (or so). The cover has also been "cleared" for that reason.
So would I be looking for clearances as per an original motor or are they likely to be different for the bigger cam?
Last edit: 15 Dec 2012 20:20 by Sorf.
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- peter1958
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Re: Valve clearances on a modded engine
15 Dec 2012 20:23
same as reg motor
www.kzzone.com/
cavanaughracing.com/kzdata.html
www.mtceng.com/index.php/us-dealers/44-f...-performance-orlando
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- Sorf
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Re: Valve clearances on a modded engine
15 Dec 2012 20:33
Thanks, you can tell I'm no mechanic!
Just wasn't sure whether or not things may need to be changed a bit from standard.
Just wasn't sure whether or not things may need to be changed a bit from standard.
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- woodman
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Re: Valve clearances on a modded engine
15 Dec 2012 21:06
This is my own personal preference, if its a big bore motor I like to run a little more like .006 because of the extra heat
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- 4TheKZ1000
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Re: Valve clearances on a modded engine
16 Dec 2012 03:27
Web Cams requires .006 valve clearance on a .395 lift cam Im running.
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- webdesignservice12
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Re: Valve clearances on a modded engine
16 Dec 2012 06:28 - 16 Dec 2012 09:35Attachment fireburnexplodegif.gif not found
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- turboking
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Re: Valve clearances on a modded engine
16 Dec 2012 12:46
cammotion , webcam, kenny harmon, andrews rc engineering , V&h. and most other after market cam shaft manufacturers give lobe clearance specs of .006 to .008 COLD for air cooled engines. i set my Z1 and suzuki stuff @.006 (Int and Exhaust) .008 does make the clatter more noticeable when using a thin valve cover.. I would not run .004 on aftermarket cams. (just my .02) better to be loose than too tight and burn an exhaust valve.
2005 Kawasaki mean streak
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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
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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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- Sorf
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Re: Valve clearances on a modded engine
17 Dec 2012 07:41
Good work guys! I'll go with what's being said then.
Thanks
Thanks
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- Sorf
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Re: Valve clearances on a modded engine
13 Jan 2013 00:37 - 13 Jan 2013 01:15
OK so I need a bit of help here 
I thought clearances needed to be measured as the largest dimension?
Also thought this was meant to be with the cam lobe facing vertically up from the shim?
But I'm finding the greatest measurement is at TDC (with the lobes facing away from each other)
Which one do I use as the clearance?
There doesn't seem to be any relation to the two sets of measurement either....would this be due to cam wear or just how it's ground?

I thought clearances needed to be measured as the largest dimension?
Also thought this was meant to be with the cam lobe facing vertically up from the shim?
But I'm finding the greatest measurement is at TDC (with the lobes facing away from each other)
Which one do I use as the clearance?
There doesn't seem to be any relation to the two sets of measurement either....would this be due to cam wear or just how it's ground?
Lobes vertical to shim | TDC - Lobes facing away from each other | |||
Cylinder | Intake | Exhaust | Intake | Exhaust |
#1 | 0.05 (0.002”) | 0.11 (0.004”) | 0.08 (0.003”) | 0.12 (0.005”) |
#2 | 0.06 (0.002”) | 0.11 (0.004”) | 0.07 (0.003”) | 0.17 (0.006”) |
#3 | 0.08 (0.003”) | 0.14 (0.005”) | 0.08 (0.003”) | 0.23 (0.009”) |
#4 | 0.08 (0.003”) | 0.07 (0.003”) | 0.10 (0.004”) | 0.06 (0.002”) |
Last edit: 13 Jan 2013 01:15 by Sorf.
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