Valve springs

Hi Peter,

My 1957 Dominator has them, they are to act as a heat shield apparently.

Regards

Dick

Part Numbers - VALVE INSULATION WASHERS P/Ns - 067845

There are two thicknesses of these washers around. Depends on the valve springs .......standard or SS.

hello  All Now the Norton Manxman 650 Has 3 sizes of Valve spring Insulating washers  and Shims and 3 types  valve spring tensional strengths  All listed I my Norton Manxman Parts catalogue,  ThIs model had its own parts  Manuel  and Now very very hard to find it's very lucky I have obtained one, 

Yours   Anna J   

Peter did post that his bike was a Dominator Model 99.

Manxman 650 parts may be of interest to him and may fit but do not really answer his question.

I believe that it also depends on which cam you have. The standard Domi cam would use the 2" long springs but if you have an SS cam you would use the shorter type as fitted to 650s onwards.

I think that heat insulators would be fitted which ever cam you use. As to the shims as listed in the parts manual, I don't know what the loading should be on the springs.

Paul