Upshur's opposed twin engine

[Brian Rupnow]

And this is all the work I'm going to do today. The brass has been sized to fit into the groove in the top of the rotor and glued in there with J.B. Weld. Tomorrow I will see whether or not the J.B. Weld is going to stick to the rotor.

 

[Jasonb]

I use the clear silicon ones that S/S do/did, same as Gordons link. It is a spring inside the boot which grips the end of the plug. They also do the flat type but with your engine there would be a lot more risk of the spark jumping to where it should not as the flat plate is not insulated

 

[pileskis]

S/S had what you ar3e looking for but he has retired. Apparently someone else has taken over the business

https://www.cncengines.com/index.html

Yes. Roy has retired to some extent, and now it is being carried on by a new fellow. Nice guy. He knows the ignition systems.

Brian- I would doubt that CT would have anything for a plug of that size. Maybe??

I know cnc has them

Sid