BannedCR500Riders.com

Hello there glen
Im looking for a 5mm cylinder spacer. I want to run a late model crank, rod and cylinder on my 86 cases. Does anyone make one or is this custom?

Thanks Sam

Last I knew, cometic made them, but you'll also have to have the cases bored to fit the large O.D. of the cylinder sleeve, and longer studs in the cases.

I ran the cometic kit on my gen-1. I don't remember the part numbers, but you could give them a call.

does cometic use aluminum or what ?

yup
they sell a kit w/ 1 AL spacer and 2 thin (high comp.) base gaskets.

just the way to spoil a good motor

dannygraves wrote:I ran the cometic kit on my gen-1. I don't remember the part numbers, but you could give them a call.

Thanks you, did you have any issues with the kit? remember the cost?
Cheers

no issues w/ the kit. I didn't like the thin hicomp base gaskets since they are thin without the metal shim, so I used a very thin coat of yamabond on the bottom, used some shims and ticghtened it down and cleaned up the excess, then used a standard cometic metal shim base gasket to make it easier to pull the jug later.
It wasnt very pricey, I want to say like $30-$40 or somehting like that.

dug up an old e-mail from them:
This is what you will need for a 5mm spacer kit:

1 - B0016188A $28.25 each
2 - B0016012F $6.30 each (12.60)


Kevyn Kistner
Technical Sales
Cometic Gasket


#2 is the thin hi comp gasket, your call if you want to run 2 of them or do like I did.

MOABNUT, I have some spacers.I would need to know in sae what size ?When I got these years ago from COPPER GASKETS they came in SAE sizes. You do know there is quite a bit of moding to the bottom end to ues the later top end.PM me Glen

How much grinding is required to the cases? It looks pretty close. Is trimming the skirt off the cylinder a no no?

if you plan to use .020 gasket on top and bottom of the plate youll need about a .177" thick. thats assuming you want to keep port/deck heights the same as before.

Heres a set of older cases being machined to take later cylinder. Glen

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Is the machined area where I see the red marker? were those cases sandblasted?

Thanks for all the info glen