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Seized Engine 1982 KZ750 CSR (M1) 17 Jun 2019 08:11 #805919

  • loudhvx
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Did you normally start the bike with the kickstart?

Are you sure it's still locked up now that the clutch is disassembled, the kicker should rotate the inner part of the clutch which you should be able to watch?

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Seized Engine 1982 KZ750 CSR (M1) 17 Jun 2019 08:50 #805923

  • Duckinfumb
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It's always been kickstart only as long as I've had it.
Even with everything disassembled the kickstart won't move.
1982 KZ1000
1982 KZ750 M1 (CSR) twin *RIP*

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Seized Engine 1982 KZ750 CSR (M1) 17 Jun 2019 10:31 #805932

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Duckinfumb wrote: It's always been kickstart only as long as I've had it.
Even with everything disassembled the kickstart won't move.


With it disassembled, even in neutral, the kicker won't move?
I thought you said the kicker moves if the clutch lever is pulled?
Being disassembled is like having the clutch lever pulled.

In that case, check the big nut in the center of the clutch. The pusher, which is like a mushroom shape, just pulls out. There is a ball bearing behind it which may fall out, so be aware.

Check that the big nut is tight and that the inner basket of the clutch doesn't move in and out.

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Last edit: by loudhvx.

Seized Engine 1982 KZ750 CSR (M1) 18 Jun 2019 15:31 #806033

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As soon as I took my spring plate off, the kicker started rotating. As I tighten it down it locks the kickstart. Just the pressure of having all bolts and springs finger tight makes it 90% harder to rotate - 100% being immovable.. I took the pusher out AND the ball bearing out and inspected them. I'll post pics.
1982 KZ1000
1982 KZ750 M1 (CSR) twin *RIP*
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Seized Engine 1982 KZ750 CSR (M1) 18 Jun 2019 15:44 #806035

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I can pull the pushrod out from the other side and its still locked up. (ball bearing is still in it I promise.)
1982 KZ1000
1982 KZ750 M1 (CSR) twin *RIP*

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Seized Engine 1982 KZ750 CSR (M1) 18 Jun 2019 17:17 #806051

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The rod can come either way, but I think the ball bearing, if it's the right size, can only come out on the clutch side, not the sprocket side. That is how it is on many Kz's.

The kicker engages the first gear on the output shaft, and that first gear engages the first gear teeth on the input shaft (which is the shaft that the inner clutch basket is connected to). I wonder if something came loose that now allows the clutch basket to move and causes first gear to engage while another gear is engaged.

Does the inner basket move out or in when the pressure plate and springs are out?
When it's assembled, the springs are trying to pull the inner basket away from the motor.
Your clutch nut looks tight though.

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Last edit: by loudhvx.

Seized Engine 1982 KZ750 CSR (M1) 18 Jun 2019 18:43 #806055

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Here are some pics of the in and out put shafts with all the gears and kick starter mechanism.



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Seized Engine 1982 KZ750 CSR (M1) 18 Jun 2019 19:29 #806064

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I my opinion your kick starter mechanism (gear on the shaft) locked your output shaft.

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Seized Engine 1982 KZ750 CSR (M1) 18 Jun 2019 19:33 #806065

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My first thought was the return spring on the kickstarter too, but some of the symptoms didn't seem to agree.

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Seized Engine 1982 KZ750 CSR (M1) 18 Jun 2019 19:45 #806066

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The kick starter sprocket is permanet in gear with the sprocket of the 1st gear of the in- and output shaft.
As soon as he remove the clutch springs (pressure) from the clutch pressure plate the outer clutch basket has no power/torque flow to the inner clutch hub.
All parts now move free as normal.

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Last edit: by Scirocco.

Seized Engine 1982 KZ750 CSR (M1) 19 Jun 2019 05:19 #806081

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Those photos of the broken 750 trans show everything perfectly. I wonder what happened to that bike (I see the broken gear, but why) ? Maybe something similar to Duckinfumb's bike?

I was thinking the kickstart locked up first gear, but then he said the bike can roll in first gear with the clutch lever pulled.so first gear is not locked up. If the bike can roll in first gear, and the engine can turn, then the clutch should be able to turn the crank.

That's why it makes me think there is something with the clutch or the transmission's input shaft (which is the inner clutch basket's shaft). Maybe a shift fork is out of place.? I'm stumped.

It would be nice to know if the clutch inner basket moves as it should and does not have excessive end play, but his photos show it to look pretty good.

Duckinfumb wrote: I went back out and put my clutch back together, threw it in first, and I can roll it backwards with my clutch engaged. ... I can go as far backward AND forward doing this as I want to.
My kickstart swings with an engaged clutch as well, idk if that matters


I wonder if he could see it by removing the oil pan? Maybe not. At that point it might be easier to drain the oil, pull the motor, mount it upside down, and remove the lower case. That's a huge pain in the ass but at least he doesn't have to disturb the cylinders or head. It would be a shame to do all that and find it's something simple with the clutch or shift fork.

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Last edit: by loudhvx.

Seized Engine 1982 KZ750 CSR (M1) 19 Jun 2019 09:42 #806091

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I took the pressure plate completely off and nothing wiggles at all. Everything is secure, and rotates smooth.

As soon as I start tightening the pressure plate back on, everything gets real tight and locks up. I took the kickstart plate off and everything looks 100% in there also..
What would cause my clutch to lock up as I tighten the spring plate springs and screws?
Matt
1982 KZ1000
1982 KZ750 M1 (CSR) twin *RIP*

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Last edit: by Duckinfumb.
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