Navigator barrel

Hi Dan,

To quote from Andy Sochanick's definitive article from the Club's archive: In late 1963, a modification was carried out at Plumstead to the top of the cylinder. Previously, the cylinder barrel had a 2mm tall spigot which protruded into a recess in the cylinder head. At first on the Electra, and then gradually across the whole range of Nortons, this spigot disappears. Careful measurement on several Navigators and Electras confirms that, instead of simply removing the spigot, the factory allowed the cylinder to be 2mm taller. Consequently, the cylinder heads had 2mm shaved from them at the joint face. Beware of these differences when shopping around.

Your early engine number suggests that you'll have the spigot-socket head-to-barrel connection.

Regards,

Ian.

Hi Dan, did you ever get any barrels? I've just got an old Navigator and it has a crack in the lower part of the cylinder.Not sure if i need to replace it, or if i can get it relined? Just wandered how you got on?

Tom

Previously Dan Field wrote:

Previously tom_flynn wrote:

Hi Dan, did you ever get any barrels? I've just got an old Navigator and it has a crack in the lower part of the cylinder.Not sure if i need to replace it, or if i can get it relined? Just wandered how you got on?

Tom

Hi Tom,

I managed to get a new one from the club and a pair of 10 over pistons, I've had some significant Yamaha damage which has taken most of my time so havent got any further!

Dan

Thanks Dan did you buy the cylinder via the clubs spares list or through the services section?

Tom