too many early Z1 heads???

[malmojoe]

I have been looking for an early Z1 head for my bike and know that there is no O ring groove and that the bosses where the vacuum take offs are still there in the casting - and not there in the Z1000 head - even theough the O ring has dissappeared.

Dave Marsdens book says that the O ring was introduced about 14000 or something, so that should make the earlier heads pretty scarce, but there seems to be a lot of later heads (78 and so on) in USA which also have no O ring and the bosses still in the casting. What are they from and are they really tha same as the early Z1 heads or not?

clarity much papreciated before I waste more money

[Garn 1]

MalmoJoe, I think you may be confusing the groove in the head with the groove in the barrels. There is no 0-ring groove in the head. It's an easy mistake. Have a look at Zed1015's photo of the barrels (your posting... "Can you identify this piston?"

I'm not sure if they still had the o-ring groove in the barrels of the Z1000-A2, however, the Z1000-A1 had the groove in the barrels. all Z1ooo's had no boss for vacuum nipples.
RegardZ.

[malmojoe]

Cheers Garn, I was thinking that it would be an engineering nightmare to match up those grooves ..

So, all the 900 heads are the same as mine and anyone will do ???

[Keefleaf]

NO !

[malmojoe]

eh?? not the same?

[Keefleaf]

There was a post on early heads way back,prob' lost in meltdown?
I've got a couple of earlyish heads,subtle changes.
I will Email you images,maybe you could post them up,( I can't).

[malmojoe]

cheers Keith.

[hutch]

some z1000s and z1rs have the boss castings for the vacuum take offs , i also have some z900s ,some with the casting ,some without .i have also seen a head without the boss but with the narrow outer fins .you dont honestly think they just had the one mould for all the heads cast .

[malmojoe]

bloody hell Hutch, I just thought I was getting a handle on it.