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Oversize head gasket

CYP77 - Police | Race Bikes | Choppers, Bobbers and Mods
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CharlesM Member
Posts: 20
Joined: Sat May 23, 2015 4:45 pm
Location: London, UK

Oversize head gasket

Post by CharlesM » Tue Mar 14, 2017 6:13 pm

I race a CB72 bored to 64mm. I am finishing the refresh and need to replace the head gasket. Last year I used a CB77 standard gasket, which was ok, but the edge of the piston just clips it Boretech in the states do a 66mm gasket, but that's about 150$ to get it to England.

Having gaskets made will be about £100 to set up the tooling as a minimum.

Any ideas on suitable alternatives? So far, my plan is to use a CB77 gasket again.

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G-Man Member
Posts: 5675
Joined: Wed Mar 25, 2009 5:17 pm
Location: Derby, UK

Post by G-Man » Wed Mar 15, 2017 3:05 am

Hi Charles

Have you talked to anyone about laser-cutting you a copper one? Apart from getting a drawing done and the cost of the copper it shouldn't be too expensive. ... materials/

These guys could probably adjust the bore size of this part... ... 25b5cdfbb8

'60 C77 '60 C72 '62 C72 Dream '63 CL72
'61 CB72 '64 CB77 '65 CB160
'66 Matchless 350 '67 CL77
'67 S90 '77 CB400F

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malcolmgb Member
Posts: 401
Joined: Mon Nov 07, 2011 11:52 am
Location: Midlands UK & Cleveland OH

Post by malcolmgb » Thu Mar 16, 2017 5:26 pm

1977 CB400F
1973 CL175
1976 XL175 - Sold
1964 CL72
1966 CA78

lloydy1 Member
Posts: 66
Joined: Sun May 24, 2015 2:29 am
Location: North Wales

Post by lloydy1 » Fri Mar 17, 2017 3:20 am

Hi Charles

I made one up myself....made a template up and cut it out of a copper sheet.

IMG_1476.JPG (78.84 KiB) Viewed 1936 times

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