KZ900 Cam timing: GPZ1100 camshaft swap

Hi all,

I'm in the process of swapping the stock cams on my 76 kz900 with 83-84 gpz1100 cams.
What I'm wondering is if I should get ADJUSTABLE sprockets from APE (ACS900K) or FIXED sprockets (ACS900K-2B) for the job?
I'm not quite sure how GPZ1100s are timed, but I see that some of you successfully installed the gpz cams so...Your advice is greatly appreciated.


BTW, I'm swapping cams because my intake cam got damaged while I was tuning my bike a couple days ago. The shim on #1 intake slipped out of the bucket and shot through valve cover. Now, I've never seen that happened :S I'm pretty bummed as it was a fresh built motor with 500 miles on it, but I'll take it as an opportunity for upgrades(i.e. porting, high lift cams, gas tank paint finally, etc...)

Did you change your shorts too? Mine woulda looked like I sat in some grease.

You need the ACS900K-2B converter sprockets as these fit the 2 bolt GPZ camshaft ( The 2B denotes 2 bolt holes )
The ACS900K will not fit the GPZ cam as these are 3 bolt fitment.
BOTH types are adjustable.
Using the 83 GPZ unitrack cam it is recommended that you convert to under the bucket shim arrangement to avoid a repeat of the shim spitting incident.

I caught it fast enough to not spill oil all over myself

zed1015 wrote: You need the ACS900K-2B converter sprockets as these fit the 2 bolt GPZ camshaft ( The 2B denotes 2 bolt holes )
The ACS900K will not fit the GPZ cam as these are 3 bolt fitment.
BOTH types are adjustable.
Using the 83 GPZ unitrack cam it is recommended that you convert to under the bucket shim arrangement to avoid a repeat of the shim spitting incident.

Perfect, That's exactly what I needed to know. Thank you.