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exhaust threads

have a model 50 head with exhaust threads gone , are any oversize spigots or inserts around.



Hello Michael

If it helps, i have machined and fitted inserts to commando heads and a Model 19 head for a chap in Ireland.



Permalink me. I am very pleased with Peter's repair to my 19S head. He made a bronze insert, threaded internally and externally, pinned to the head.

Ian McD

Exhaust Port Insert


RGM do a Helicoil for the exhaust threads.  Much stronger as it removes the minimum of the porous original casting.  The problem is that Roger is snowed under with work as he no longer has a workshop assistant.

Another thing to try is to wrap the threaded collar with aluminium foil to pack it out.  You can get the sticky-backed stuff, but the glue will melt and may make a mess!


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