Plug cap falling off
 

I am a bit new to gas engines.

I have bought a NGH 26GT which I have mounted inverted in my new bipe. I have been conducting test/break-in runs in the garden and a couple of times the plug cap has fallen off. It has a glow plug thread miniature spark plug and the cap has a small spring inside which would tend to push it off.

The instructions are a bit scanty. Am I not pushing it on hard enough or ought I to squeeze the cap slightly to get a better grip? Or do you twist it to lock once it is on?

Suggestions gratefully received!

Push the cap on with some force and then turn it clockwise about 1/4 turn and it will "lock" on.

be sure the plug is in tight or you will be unable to remove the cap.

Thanks for your help _ I thought that might be the answer.

a pity it is not mentioned in the instructions