Cam positioning for Andrews cams on a 76 kz650

Andrews cams are stamped on the ends.
Recheck your math.


..

I always planned on a #30 with .370 lift when I dreamed of the 810 or 831 kit..... even called em about it way back when......... hope you get it figured out.

From what I've seen so far, the cams have been set. Was the bike running before you opened it? The vague setting on the sprocket has me worried. Be careful.
Steve

had to get a battery for my caliper so my first numbers weren't exact but it's all set now. The Lift comes out to .410 I've included picks of the measurements in case I'm doing something crazy. I also attached a picture of the Andrews and CWC markings cast into the shaft. I know it doesn't have the stamping on the end of the cams but If they aren't Andrews what else would they be? Maybe they are from an early run.

I actually just bought the bike last month Steve. It was not running and had been sitting for the last twenty something years. I cleaned and rebuilt the carbs and started it up but it was backfiring a lot and hard to start. So I opened it up to shim the buckets ( which it did need) and when I went to reassemble got into this pickle.

I may be wrong but all pref. cams for the small fours are a hardwelded
reground stock cam. Webcam told me that noboby sold blank cam core's for these motors
Andrews at one time made billit cam core's for the big motors but not the small motors.

As for the CWC that is a casing mark from the company that made the cam core's for Kaw.
Both my stock KZ650 and stock ZX750A1 cams have that.

That doesn't explain the Andrews cast in one of the cams. They responded to me. Maybe I called first. Don't remember. That was two years ago. I thought you might know more about these being you are into the small fours. All I can do is guess.
Steve

I remember legendary Moriwaki also offered .410 lift cams for the kz650/750s.

Andrews is cast into both of them. I got an email back from Andrews but they just said the grind number should be stamped onto the end of the cam and gave me the 650/750 chart I posted earlier that only has up to a .392 lift. I wrote back to them and sent along some pictures hopefully they will have some idea what they are.

Also, when the degreeing tutorial says "Remove all valve lash (clearance)" are you supposed to shim the bucket as close to zero as possible?

The Andrews looks hand stamped not cast to me.
If it were cast I doubt it would run down hill.

Also I'd think the grind number would be stamped on the end before the cam was ground
so the machinist knows what grind it gets.
and to keep them from getting mixed up with other cams.

They were production cams. The stamp designates the product. They wouldn't mix grinds in production. The numbers stamped at the cam sprocket bosses should identify them. It did appear they were adjusted in different positions. If it were me, I'd get some stock sprockets to compare them with.
Steve

Andrews got back to me but said they wouldn't be able to help without the grind number. The dial indicator i ordered should get here today so I'll see if I can degree them and get some numbers together tomorrow. The more research I'm doing on this the more I'm wondering if .410 are what I need on the bike. I've read that they are great for mid and top range but that low end may suffer I plan on a lot of all around riding, mostly in city and some longer trips. Are big cams like this ok to run at a longer duration? I've considered just putting some 750 cams in instead, let me know what you think.

Zac