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Standard valve sizes for Z1R D1

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Big Fluff
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Standard valve sizes for Z1R D1

#1 PostAuthor: Big Fluff » Tue Jun 12, 2018 6:27 pm

As the genuine shop manual makes no reference to the head sizes, can anyone please confirm what the standard size valves should be in a 78 Z1R ?
I have 30mm for exhaust and 36mm for inlet :roll:
They are all of the round collet type.

Additionally, the valve sets offered by Z-Power also have no head size reference either. Very helpful.

Thanks Will
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zed1015
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Re: Standard valve sizes for Z1R D1

#2 PostAuthor: zed1015 » Tue Jun 12, 2018 6:47 pm

All the same size on all the kickstart engines.
36mm in and 30mm ex.
Early 900 motors has squared collet groove and the rest are round.

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Re: Standard valve sizes for Z1R D1

#3 PostAuthor: Big Fluff » Tue Jun 12, 2018 8:36 pm

Thought as much Rob, just testing my aging sanity.
Just sorting through my old valve train parts, found a set of 38mm inlet and 32mm exhaust Manley valves out of my old Manzano head when I used to drag race in the 80s.
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rpeters
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Re: Standard valve sizes for Z1R D1

#4 PostAuthor: rpeters » Wed Jun 13, 2018 5:42 am

I think the square tops, MKII etc have the bigger valves?
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Re: Standard valve sizes for Z1R D1

#5 PostAuthor: zed1015 » Wed Jun 13, 2018 7:32 am

rpeters wrote:I think the square tops, MKII etc have the bigger valves?

Square top MK2/ST etc have the same 30/36 valves.
It's just the H type injection heads that has them 1mm bigger at 31/37.


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