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Vintage Honda Owners,
Restorers, Riders and
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Big Bore 338cc / 350 cc kits - head gaskets?

 
Post new topic   Reply to topic    Honda305.com Forum -> Motors - 247cc | 305cc | 337cc | 350cc
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wombat200
honda305.com Member


Joined: 19 Mar 2006
Posts: 151
Location: Melbourne, Australia

PostPosted: Wed Aug 25, 2010 7:26 am    Post subject: Big Bore 338cc / 350 cc kits - head gaskets? Reply with quote

Those of you that are running the 338/350cc kits in these bikes - what are you using for head gaskets? I'm not that keen on copper.....

Rob.
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ColC
honda305.com Member


Joined: 22 Aug 2010
Posts: 8
Location: sydney australia

PostPosted: Wed Aug 25, 2010 7:47 am    Post subject: Reply with quote

Hi Wombat
My 350 has original style head gasket (but for a 64mm bore) a fella in our club had about 20 made years ago by a gasket manufacturer in Sydney. I also have copper, works fine and a lot cheaper
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teazer
honda305.com Member


Joined: 08 Feb 2010
Posts: 769
Location: Midwest US

PostPosted: Wed Aug 25, 2010 8:53 am    Post subject: Reply with quote

I had Bert Kingston in QLD modify a batch of stock gaskets to suit the larger bore. Next time I'll get copper from Cometic or Les Barker.
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cknight
honda305.com Member


Joined: 05 Apr 2006
Posts: 217
Location: Daytona Beach, FL

PostPosted: Wed Aug 25, 2010 9:27 am    Post subject: Reply with quote

Cometic has CB77 composite gaskets with the proper fire ring fitted, that will accomodate up to a 65mm bore. These are available on special order as part number H0157SP5043F. Regards, Chase
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wombat200
honda305.com Member


Joined: 19 Mar 2006
Posts: 151
Location: Melbourne, Australia

PostPosted: Wed Aug 25, 2010 8:03 pm    Post subject: Reply with quote

Thanks guys - I've flicked off an email to Cometic right now.
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leonvjames
honda305.com Member


Joined: 12 Jan 2004
Posts: 49
Location: New Zealand

PostPosted: Sat Aug 28, 2010 4:25 am    Post subject: Reply with quote

I made a head gasket for my CB77, bored to 350 out of a piece of aluminium. Used an old gasket as a pattern, softened the aluminum in the oven and haven't had a problem for the last 10 to 15 years. Cheap too.
Leon, long time owner and rider.
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