kz650 choice of cams?!

i have a 1979 kz650 d3, and i was wondering what is the hottest cam i can run with stock pistons, springs, and valves? any advice on what website that has a kz650 bolt in cam would be greatly appreciated also.

4rugrat1 wrote:

i have a 1979 kz650 d3, and i was wondering what is the hottest cam i can run with stock pistons, springs, and valves? any advice on what website that has a kz650 bolt in cam would be greatly appreciated also.

KZ750

GPZ or larger will be lazy down low in the R.P.M. range.

i was thinking about the kz750 cam, but i dont want to get screwed over or something on ebay buying a used cam. i was looking online, but not much comes up, do you know of any andrews, or star cams that bolt right in? or something similar?

I believe (but I might be wrong) that the sprocket bolt pattern on the cams is not the same between the 650 and 750. The 650 used a standard chain while the 750 used a Hi-Vo chain. I would look into that before you try anything. If they do interchange, I have a set of 750 cams that aren't doing anything. You might be able to talk me out of them.

EDIT EDIT
I guess they do interchange. They both use the same two bolt pattern.

4rugrat1 wrote:

i was thinking about the kz750 cam, but i dont want to get screwed over or something on ebay buying a used cam. i was looking online, but not much comes up, do you know of any andrews, or star cams that bolt right in? or something similar?

try this www.megacyclecams.com/catalog/pages/page%2045.pdf

I thought I had seen someone mention that some of the later Kz650's also had the hyvo chain?

Update
They do interchange. they both use the same two bolt pattern.

KZ 650 did not come with hivo cam chains KZ 750 and GPZ 750 had the hivo chains you can install KZ 650 cam sprockets on to KZ 750 or the GPZ 750 cams.

Well, there you go!

is megacycle the only company that makes cams for the kz650?

From what I understand, is that no one has any blanks left for the 650/750 cams. This means that all the cams are hard-welded. That is my understanding. Otherwise, Web-Cam shows a full listing of 650/750 cams. They require your old cams to weld and regrind for $500. Because of the mild performance of the 650, they also used a mild spring. You will have to install better springs with whatever cam upgrade you choose including the stock 750 cam. otherwise you will have severe valve float.

www.webcamshafts.com/index_blank.html?pages/vehicle_search.html

Okay, thats good to know. You said you have a set of cams from a 750 layin around? Do you still have them?