There are two (or three?) O rings on the low speed needle.

That may work, but I would be worried about it loosening after a few flights. The rings get wet with glow fuel in use.


The loctite solved the problem of the needle walking on both engines, on the 1.00NX I have other problems though.

The PTS engine is wonderful now... It was easier to get running reliably than say the T.H. .46.


I've been fighting with the Evolution 1.00NX all season. I didn't know about it needing a 4 stroke plug until recently too.


In contrast a new O.S. .46 AX and LA both started out of the box and required relatively few tweaks.

The Evolution .455 PTS did fairly well until the needle started walking. The Loctite fixed that. On the fifth tankful I had a reliable engine.

A new T.H. .46 was a bear for the first gallon of fuel then settled in perfectly, and became easy to adjust after an additional half gallon.