It's not a pull start it is the race version R12103 with the turbo head and now the turbo plug.
As it is in my fw-05rr for pro nitro.
I know that the techwell engines are fast well about the same top end as nova's and o.s. (just not alot of torque)
But thats not the problem the engine it is overheating in under 5 minutes.
At the moment i have put a o.s tz head on it to reduce the heat and it looks to be going fine.
i have checked for:
Fuel
Airleaks
cooling
dirt clogging
tuning
But i think it is the head,i wont be able to test it properly untill this sunday.