Twostik,


I guess from what you wrote that you have the glow version, with a normal MVVS carburettor.
Correct me if my assumption is wrong.

I also guess the #3215 carburettor is an older (over 3 years old) version, that still has the blunt ended idle needle.

This needle should be initially set so its body is 1.2 mm (about 0.005". 2 mm/0.008" for the new, tapered end needle) from the throttle arm nut.

For the Walbro carburettor, a good initial setting is both needles 1.75-2 turns open.
The rubber/Teflon parts of the Walbro will eventually deteriorate in methanol, so their replacement is required every 6 months, or so.


This engine is designed to run on no nitro, 85/15 methanol/Castor oil fuel.
You can replace 3-5% of the methanol with nitromethane, for better consistency.