Ricardo,


Besides the Novarossi C6 plug the engine comes with, the OS #8, the Enya #3 and the K&B-1L are the correct heat range to be good replacements.

I am aware Fox and other manufacturers also have similar glow plugs.


There is a very remote possibilities that your specific engine has all the production tolerances added up, to make the compression excessive, but I don't think so.

Is your engine cowled in, so as to impair its cooling (the cowl must have an exit twice as large as the enterance and it should have baffles to direct the airflow around the head and the cylinder cooling fins.

The added length of the tuned exhaust should manifest itself, in the distance between the header's rear end and the muffler's front' within the longer silicone coupling. You can buy such a silicone tube and it should not be too expensive.

The 10x8 prop should provide faster airflow, for improved cooling, but even with a low-pitch 12x4, cooling problems should not be evident.

The older carburettor has some behavior problems, from the low to high speed transition being too rich. And also a long term part-throttle condition make the engine load-up.
The only good solution is a new style #3216/3219 carburettor.