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Valve Adjustment Measurements 28 Mar 2019 11:57 #801178

  • lousankz
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SWest wrote: .002 is approx .05mm so a 205 is approx .002 bigger than a 200. I like to measure in thousands of an inch not millimeters. What are the rest of the sizes? That should give you a ball park to go on.
Steve


Makes sense, it certainly gets confusing when you forget that some people are replying in metric and others in non-metric. I have 200 x 3, 210 x 3, 230 x 3. The shop I am buying these from didnt have 220, so I just bought a range of sizes to get started since I was scared about the zero-clearance on a few of the valves. After the first re-measure, I think I need at least 2 more in 225-235 range to get this write. Ugh, back to shop.
1981 KZ750E

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Valve Adjustment Measurements 28 Mar 2019 12:17 #801179

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If some are close to the end you may be able to swap them around to make them within spec.
Steve

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Valve Adjustment Measurements 28 Mar 2019 12:30 #801180

  • ThatGPzGuy
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What SWest said.
I build myself a little cheat sheet so I can do all my swapping around on paper first then install and check. And check again.
At one point wasn't there a shim swap on KZRider or was it just something we talked about?
Jim
North GA
2016 Yamaha FJR1300ES
1982 GPz750 R1
1974 Kawasaki H1
1976 Kawasaki KZ400
1979 Yamaha XS650 cafe'
2001 KZ1000P
2001 Yamaha YZ426
1981 Honda XR200 stroked in an '89 CR125 chassis
1965 Mustang
1967 Triumph GT6
1976 Bronco
"If you didn't build it, it's not really yours"

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Valve Adjustment Measurements 28 Mar 2019 13:08 #801185

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ThatGPzGuy wrote: What Swest said.
I build myself a little cheat sheet so I can do all my swapping around on paper first then install and check. And check again.
At one point wasn't there a shim swap on KZRider or was it just something we talked about?


I wrote out a cheat sheet this morning with all the sizes that I have and what sizes were in each valve when I took original measurements and have been writing out calculations for how close I can get each valve with the supply that I have. I think I might be able to get it done on this next round now that I have a better understanding of sizing and how it affected the clearance on the valves with issues
1981 KZ750E

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Valve Adjustment Measurements 28 Mar 2019 13:21 #801186

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Nice job. Make sure you keep it for the next time.
Jim
North GA
2016 Yamaha FJR1300ES
1982 GPz750 R1
1974 Kawasaki H1
1976 Kawasaki KZ400
1979 Yamaha XS650 cafe'
2001 KZ1000P
2001 Yamaha YZ426
1981 Honda XR200 stroked in an '89 CR125 chassis
1965 Mustang
1967 Triumph GT6
1976 Bronco
"If you didn't build it, it's not really yours"

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Valve Adjustment Measurements 28 Mar 2019 20:12 #801201

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Alright guys.. very scary update to give.

Got my final calculations, got the shims under the buckets, got the cams installed back to spec via lines and # of chain links, go to crank the motor over clockwise after tightening the cam chain tensioner and the the crank wont move. It feels frozen, I didnt push it hard at all out of fear. I pulled the cams off again just to see if for some reason the cams were affecting the ability to crank clockwise and the crank wouldnt turn with the cams off either. I am not missing any tools or bolts so I dont think anything fell in there. I have been able to crank it around over multiple times after removing and re-installing with no problem, so now I am very scared.

please help haha
1981 KZ750E

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Valve Adjustment Measurements 28 Mar 2019 20:17 #801202

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Make sure the cam chain isn't bound up on the crank.

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Valve Adjustment Measurements 28 Mar 2019 20:23 #801203

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I assumed the chain didnt wrap around the crank because I was able to get the cams back on and the chain lined up before it froze. Is there a chance that there is enough slack in the chain (possibly from not tightening the cam chain tensioner correctly, my fault) that it could wrap around the crank with the cams on?
1981 KZ750E

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Valve Adjustment Measurements 28 Mar 2019 20:42 #801205

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Yes, with the cams and tensioner off carefully rotate the engine counter clockwise while pulling up on the chain. If it's bound up you will feel the chain come up as you turn the crank.
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Valve Adjustment Measurements 28 Mar 2019 21:08 #801206

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baldy110 wrote: Yes, with the cams and tensioner off carefully rotate the engine counter clockwise while pulling up on the chain. If it's bound up you will feel the chain come up as you turn the crank.


So this worked with the cams off, I was able to rotate the engine freely clockwise with the chain pulled up and it seemed fine. Got the cams back on and ran into the same issue. I’m tired so I give up tonight but I’ll spend more time on it this weekend. Thanks for the input!
1981 KZ750E

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Valve Adjustment Measurements 29 Mar 2019 09:29 #801233

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I havent changed/drained the oil yet from the motor although all the leftover oil in the valve/cam area is gone via leaking down through the valves. Is there any chance it could be a lubrication problem? I am guessing not based on the resistance I am getting on the wrench when trying to turn the crank with the cams on, seeing as I am unable to move it at all (without literally standing on the wrench to see what I can break)
1981 KZ750E

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Valve Adjustment Measurements 29 Mar 2019 13:11 #801244

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lousankz wrote:
I am guessing not based on the resistance I am getting on the wrench when trying to turn the crank with the cams on, seeing as I am unable to move it at all (without literally standing on the wrench to see what I can break)


Look into the spark plug holes to see if any valve collide with the Piston dome.
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