KZP engine rebuild

ThatGPzGuy
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More Sparky than Speed Racer

05 Aug 2016 04:20 #737490 by ThatGPzGuy

KZP engine rebuild was created by ThatGPzGuy

Well it is time to address the nagging oil leak and cracked/holed case. Here is what I am dealing with:

So while I am at it (famous last words) I was going to pull the head, replace the valve stem seals, check the valves and possibly do the rings. Anything else I should plan on doing while I have it apart? It has 44K on it and the compression was good but not great.

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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Nessism
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05 Aug 2016 05:05 #737492 by Nessism

Replied by Nessism on topic KZP engine rebuild

Your photo has me baffled. What are we looking at there?

Ed
Carb O-ring Kits : www.kzrider.com/forum/3-carburetor/61807...-o-ring-kits?start=0

www.kzrider.com/forum/faq-wiki/618026-new-owner-things-to-know

1981 KZ750E2
www.kzrider.com/forum/11-projects/604901...z750e-project-thread

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daveo
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05 Aug 2016 05:24 - 05 Aug 2016 05:29 #737493 by daveo

Replied by daveo on topic KZP engine rebuild

That looks like a good Winter-time project to me... :whistle:

But then again, you have another bike to play with. :cheer:

1982 KZ1100-A2

Last edit: 05 Aug 2016 05:29 by daveo.

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ThatGPzGuy
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05 Aug 2016 07:13 #737517 by ThatGPzGuy

Replied by ThatGPzGuy on topic KZP engine rebuild

Nessism wrote: Your photo has me baffled. What are we looking at there?

It's the bottom of the case on the shifter side. It drips pretty bad and has to be fixed.

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ThatGPzGuy
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05 Aug 2016 07:15 #737519 by ThatGPzGuy

Replied by ThatGPzGuy on topic KZP engine rebuild

daveo wrote: That looks like a good Winter-time project to me... :whistle:

But then again, you have another bike to play with.

True dat!
I love riding the Cop bike but in the heat of summer I prefer a bike without a WS. I just got the café bike running really well so I am looking forward to putting a few miles on that. It's no highway cruiser though...
Hopefully I'll get the cop bike back together in time for the ride to Barber.

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baldy110
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05 Aug 2016 07:58 #737527 by baldy110

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You do realize that is a case replacement injury, right?

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ThatGPzGuy
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05 Aug 2016 08:12 #737531 by ThatGPzGuy

Replied by ThatGPzGuy on topic KZP engine rebuild

baldy110 wrote: You do realize that is a case replacement injury, right?

I realize that is a possibility. I won't know how bad it is until I get that JB weld off. I've been riding it like that for the last year or so and besides the leak it runs very well.

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Nessism
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05 Aug 2016 11:11 #737552 by Nessism

Replied by Nessism on topic KZP engine rebuild

A good welder may be able to fab a fix. A new case would be another option too of course.

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baldy110
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05 Aug 2016 13:31 - 05 Aug 2016 13:32 #737564 by baldy110

Replied by baldy110 on topic KZP engine rebuild

That area holds the crankshaft and there is a lot of energy and movement that goes through there. It would be cheaper and whole lot easier to get a matched set of used cases and use them. Another thing to consider is how was that hole created,, threw a rod, foreign object introduced, etc.. It has already been exposed to a violent action so there might be other cracks or problems in the area.

Last edit: 05 Aug 2016 13:32 by baldy110.

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ThatGPzGuy
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05 Aug 2016 15:34 #737573 by ThatGPzGuy

Replied by ThatGPzGuy on topic KZP engine rebuild

Nessism wrote: A good welder may be able to fab a fix. A new case would be another option too of course.

Yeah there are a few out there on eBay for around $150. As soon as I get it out and the JB weld removed I can see what I am dealing with.

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ThatGPzGuy
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07 Aug 2016 05:41 #737692 by ThatGPzGuy

Replied by ThatGPzGuy on topic KZP engine rebuild

Got the head off. About what I expected.

I'm either going to take to my regular machinist or ship off to larry. What am I looking at for just a basic valve job?

Here are the jugs.
There seems to be a little bit of corrosion on the piston wall. Other than that the bores look good with a slight ridge.