G'day

I have a ST 51 and it was just like yours. The first thing that made a big difference was a different plug. I started with an OS F (four stroke) plug, and this made the engine usable. Later I tried an Enya #3 (said by many to be the Rolls Royce of glow plugs). This made the engine perfect. That plug is still in the engine after six months occasional use.

I use fuel with 10% nitro, 5% castor oil, 15% Klotz T200 synthetic oil and 70% methanol.

Mike in Oz