Honda-SOHC

SOHC.co.uk Forums => CB500/550 => Topic started by: masonmart on May 26, 2016, 01:27:07 PM

Title: barrel spigot diameter
Post by: masonmart on May 26, 2016, 01:27:07 PM

The CB500 that I'm working on has a big bore kit fitted. Have just put the gasket in place, set on the barrels and then put on the cylinder head. Horror! the gasket between the crank case and barrels had split and the ends were sticking out. My guess is that the gasket was a CB500 (I bought the gasket based on the bottom end) and the barrels are of a 550 because you can't otherwise bore them out for the big bore kit.

Could there be any other reasons for this to happen?

Title: Re: barrel spigot diameter
Post by: hairygit on May 26, 2016, 02:10:35 PM

Crap aftermarket gaskets? The most likely reason is the crankcase mouths have been machined out to suit the 550 barrels, chances are with a 550 base gasket all will be well.

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Title: Re: barrel spigot diameter
Post by: masonmart on May 26, 2016, 02:47:30 PM

Quote from: hairygit on May 26, 2016, 02:10:35 PM

Crap aftermarket gaskets? The most likely reason is the crankcase mouths have been machined out to suit the 550 barrels, chances are with a 550 base gasket all will be well.

Sent from my X6pro using Tapatalk

Just looking at the gasket and it really is poor quality. Ordered a new gasket but it's annoying being held up.