Z1000J type cams

[Mick J]

Guys, looking for camshaft advice. Cylinder head is a z1000j with camchain adapter on z900 bottom end with 1075 wiseco pistons. Are the later cams, Z1000j/gpz1100 type a smaller base circle than the early type? I am looking for general advice on which cams to run in this head, I was planning on using early type cams, but not sure if they are compatible with the later head. Any advice would be much appreciated, TIA, Mick

[DeadZedDave]

The info. you need is most likely posted here:
viewtopic.php?f=2&t=51038
It will depend very much on how you intend to use the motor and what you are looking to achieve. Though I've not used standard "early type / kickstart motor" cams in such a motor, I'd expect that if you want something with a strong mid-range which will be easy to live with, if you choose the right carbs you'll get good results. You could always give it a go and see how it runs ?
Dave.

[zed1015]

Are the later cams, Z1000j/gpz1100 type a smaller base circle than the early type? I am looking for general advice on which cams to run in this head, I was planning on using early type cams, but not sure if they are compatible with the later head.

J/GPZ cams are the same base circle as the z900/z1000 and all will run in either head type.
There's no point in using J or pre Unitrack GPZ cams though as they are all similar or less lift than the stock early 900/1000 cams.

The only stock GPZ cams worth using are the 83-85 GPZ Unitrack ones which have more lift and duration than all the others.

[Mick J]

Thank you both for your help. I thought I had read something about the base circle being smaller on the later ones, the info is invaluable, cheers Mick