Piston up grade

Information relating to the Matchless G5 or AJS Model 8 350cc Lightweight
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Re: Piston up grade

Postby Martin.S » Wed Feb 13, 2019 5:35 pm

Rob, if I remember correctly you said that only the 7.5:1 pistons fit as the 8.5:1's dome was too big. Can you remember where it fouled or just needed the valve pockets enlarging?

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Re: Piston up grade

Postby ajscomboman » Wed Feb 13, 2019 6:47 pm

Martin.S wrote:Rob, if I remember correctly you said that only the 7.5:1 pistons fit as the 8.5:1's dome was too big. Can you remember where it fouled or just needed the valve pockets enlarging?


Blimey now you're asking a question. It was 20 yrs ago, from memory it fouls on the spark plug the valve clearance isn't an issue. Also the 59 HC are not easy to come by.

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