G9B conversion?

Information relating to the Matchless G9 or AJS Model 20 500cc twin
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JonHardcastle
Posts: 27
Joined: Sun Feb 07, 2016 7:25 pm
Location: Canada

G9B conversion?

Post by JonHardcastle »

Good Afternoon All,

Is it possible to swap stock G9 Barrels and Pistons with G9B? what else would be required to do the conversion?

Thanks,

Jon
Don Madden
Member
Posts: 2882
Joined: Mon Jan 01, 1990 12:00 am
Location: USA USA

Re: G9B conversion?

Post by Don Madden »

The G9B 550cc is an overbored G9 but to avoid making the barrels too thin, they were not grooved on the outer spigot for the oil channels. Instead, the G9B crankcases were grooved to create the oil channel to the R/H side of the engine. While I have not done it, it would seem that standard pre-1960 G9 Barrels should fit onto G9B cases. The stud spacing was changed in 1960 to the same as the G11 with barrels to fit. Cheers! Don.
JonHardcastle
Posts: 27
Joined: Sun Feb 07, 2016 7:25 pm
Location: Canada

Re: G9B conversion?

Post by JonHardcastle »

Thanks Don!

Merry Christmas!
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