well if it goes pop, it goes pop! Its kind of a development engine anyway so if it does not go pop I've not pushed it far enough!

I have already drilled and tapped M4 those bits you talk about but did not have time for making another mount today so stuck with the one I already made. Another job for the future.

My main worry with the lwoer crnakcase would be flexing of the case making the bearings go tight but using my highly trained engineers eye I reckon it has enough ribs to keep it all in line. Only more flihts will tell though, but first I've gotta get it running on glow. I emailed Just Engines too to ask about buying the ign, if they cannot supply I'll buy one from Holland.

Cheers,
Rich