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Hi Gus. Yes I had the issue with the carb flange fixings I made my stud centres 9/16" used 3/16" across the flats nuts and reduced the tube diameter at the flange end just enough to let the nuts engage the studs and turn. Mike.

You have made a great job of the Carb a credit to your skill, having made the carb for my Wyvern from the casting kit I can say that it was a nightmare as the casting was very near to size. Mike.

A fine looking engine, very good. Mike

Thanks everybody for the kind comments on my Wyvern, it took me some time to get to the running stage but well worth the effort. Mike.

Test run for my Wyvern still needs the water cooling fitted and a final fine tune. Mike. http://youtu.be/PvWYX6wrmE4

Gus, I made a loose keeper which slides on the valve stem and is held in place with a home-made circlip in a groove in the valve stem, the keeper is a sliding fit in the valve cage spring housing. The keeper is recessed for circlip, and a shoulder for the spring, hope the pictures help. Mike.

Gus. Nice to hear you found Metric O-rings, I like the separate flange idea for the valve cages, I never thought of that method. I am finding your build very interesting and getting some good info, keep up the good work. Mike.

Hi. " Longer Boss" by this I mean the part on the cylinder head casting that is bored out and threaded for the spark plug, I bored and threaded this to size as the drawing, but when the sparkplug (CM-6) was fitted the valve head hit the electrode on opening. In my case the plug needed a...

Hi. I have just finished my Wyvern, and looking through your threads I had some of the problems that you have had with your build, I used 1mm section viton O rings for sealing the valve cages, another problem I had was the spark plug fouling the valves, so I had to bore out the cast in spark...

Hello, Just joined this site, Having made a move from building steam traction engines to IC engines I'm sure I will get some good info from this site. I have built two Hit and Miss engines, and have just finished a Wyvern horizontal gas engine. Mike.