650 going to a 700

  • 78KZkid
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Re: 650 going to a 700

04 Apr 2020 22:18
#822642
Yes valves are stainless and larger than stock, if I could get a set of adjustable sprockets I would rather do so but if not I will just make some cuts on the stock ones .

Thanks DFI
1978 kz650

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Re: 650 going to a 700

05 Apr 2020 23:42 - 05 Apr 2020 23:52
#822687
78KZkid wrote: Started getting my engine back together but I'm at a stand still with some questions, hopefully some of you can help.

I was told that after going with larger intake valves and the upgraded cams (specs in picture) I would have to mill the cam sprockets to adjust the timing, if so how do I come up with the measurements for the machining and then what do I go off of to set the engine in time

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I cut 10 extra degrees on my KZ750 cam sprockets and ended up somewhere in the middle. Have to cut off the rubber to make it work. APE racing might sell cam sprockets for kz650s. Every new cam needs to be timed. Your cams will come with a card saying what degree the lobe center should be set at.
Read on web camshafts
www.webcamshafts.com/pages_misc/degreeing.html
'78 1000 Long Term Project
 '80 750G
 750 Twin Big Bore Track Bike
Last edit: 05 Apr 2020 23:52 by DoctoRot.

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Re: 650 going to a 700

13 Aug 2020 17:33
#832832




After setting up the engine and checking my clearances, im a little tight on the intake side. I'm going to measure the pistons to see how much material i can cut away, hopefullyI can get it where I want it without having to use a thicker head gasket.

1978 kz650

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Re: 650 going to a 700

02 Sep 2020 08:49
#834206
So im having problems getting the clearance i need without using a copper gasket, does anyone know of a different set of pistons i can use.
I'd rather not lose the compression with the copper gasket but if thats my only option so be it until I build another engine with a bigger budget
1978 kz650

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  • DoctoRot
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Re: 650 going to a 700

02 Sep 2020 11:27 - 02 Sep 2020 11:28
#834213
Is there not enough material to cut a deeper valve pocket? What the intake cam center at? could you retard that 1-2 degrees to get the clearance you need?
'78 1000 Long Term Project
 '80 750G
 750 Twin Big Bore Track Bike
Last edit: 02 Sep 2020 11:28 by DoctoRot.

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Re: 650 going to a 700

02 Sep 2020 12:35
#834223
About .275 on the piston so I'd only be able to take out .030
1978 kz650

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Re: 650 going to a 700

02 Sep 2020 16:23
#834244
Why are you using a copper gasket? They are prone to weeping.
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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Re: 650 going to a 700

03 Sep 2020 10:54 - 03 Sep 2020 10:57
#834304
How much clearance do you have now? .030"? If you can cut .030" you only need and additional .020" which you might get by retarding the cam 1-2 degrees. retarding that much will probably not make a noticeable difference in performance.
'78 1000 Long Term Project
 '80 750G
 750 Twin Big Bore Track Bike
Last edit: 03 Sep 2020 10:57 by DoctoRot.

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Re: 650 going to a 700

04 Sep 2020 21:32
#834401
Its about .020" now. Going to cut 1 piston and set it back up and see where that gets me then ill go from there on the timing.
1978 kz650

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