1200cc engine, VM29 carbs, Pods, what jetting?

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Re: 1200cc engine, VM29 carbs, Pods, what jetting?

22 Jan 2026 18:30
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Problem one, can't find Jet Block Gaskets.  

It's really going to be a problem that Sudco is gone. Not good.

How about these?


376490546198
'78 Z1-R in blue , '78 Z1-R in black, '78 Z1-R in pieces
My dad's '74 Z1
'00 ZRX1100
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Re: 1200cc engine, VM29 carbs, Pods, what jetting?

23 Jan 2026 05:26
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Yeah, there are some jet block gaskets out there that look homemade.  Kinda expensive.  I ordered a sheet of thin gasket paper.  The original gaskets are .005" thick.  Some thin paper would likely work as well.  In the past I made some out of thick velum drawing paper, after testing it in gasoline for a couple of days.
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Re: 1200cc engine, VM29 carbs, Pods, what jetting?

23 Jan 2026 13:31 - 24 Jan 2026 12:12
#920903
127.5/25 jets ordered from Niche

O-ring/gasket kit ordered from Joe's Carb.

Also, have gasket paper on order, as an experiment.

Thanks to all that contributed.

BTW, my house stinks like Berryman's carb dip.  ARG!!!  After dipping the carbs, rinsing in a bucket of water, soaking for an hour, I bought the bucket inside and did the final soap scrub in the kitchen sink.  MISTAKE!!  Just the random rinse off, after a soap scrub, stunk up my whole house!  Ha ha.  Good thing I'm a bachelor, or maybe I'm a bachelor because of crap like this?  Ha ha.  
Last edit: 24 Jan 2026 12:12 by Nessism.

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Re: 1200cc engine, VM29 carbs, Pods, what jetting?

25 Jan 2026 09:41 - 25 Jan 2026 09:46
#920932
Yeah, there are some jet block gaskets out there that look homemade.  Kinda expensive.  I ordered a sheet of thin gasket paper.  The original gaskets are .005" thick.  Some thin paper would likely work as well.  In the past I made some out of thick velum drawing paper, after testing it in gasoline for a couple of days.


 
I am pretty sure I have a small roll of velum left over from my days on the board, even had a board here at the house for about 10 years before finally selling it when they were still in demand. The last time I saw a board was at Reproduction Decals office, he still does decal patterns at scale by hand.

As for the gas mileage on that particular type of engine, you maybe be around 30 MPG or lower. I know when I was running a big pilot jet on my 831cc engine with 33 flat slides it was horrible like that, at least 20 MPG down from stock.
1978 KZ650B2 w 1197cc Z1 engine
1977 KZ650B1 w 750cc Spectre engine
1979 KZ650C3 w 831cc Hot Rod engine
1978 KZ650C2 w 762cc DFI project
1977 KZ650C1 stock restoration project
1978 KZ650B2 modified project
1978 KZ650B2 Injected Drag 831cc
1980 Z1 Custom Frame Drag 1327cc
1981 Z50R Honda tow bike
Last edit: 25 Jan 2026 09:46 by Injected. Reason: more info

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