The Home Machinist!

Granted this is not about machining but the most concentrated talent on the subject is right here.

I am about to complete an Upshur 2 cyl. 4 strokes, spark engine.
With exception of 2 strokes glow plugs, for which I have hands on knowledge from my CL model airplanes days, all I know is second hand.

Q1. Why my 1962, 2 stroke, 125CC, spark, scooter was doing fine on 2% oil/gasoline mix, but my 6cc glow plug needed 25-30% castor oil/metanol mix?

What I gathered around
-Model 4 strokes run on gasoline, no oil required if you have a wet crancase, but 2% oil wont' hurt.

-Same engine above can run on Metanol
-Metanol runs cooler than gasoline
-Gasoline is a lot more sensitive than Metanol needle setting.
-10% Nitrometane added to Metanol stabilize carburation
-Would Nitrometane added the Gasoline have the same effect?
-Are there 4 strokes glow plug model engines (I never heard of)

What kind of fuel formula you use for slow, low compression, 4 stroke, spark model engines?

Is Metanol available to the hobbist?
Is Nitrometane available?

Thank you for clarifying as many of these questions as you can.

_________________
Mauro Gaetano
in Austin TX

Don't know anything about fuels but my friends who make 4 stroke model spark engines use model sized spark plugs (not glow plugs). One guy even makes his own plugs, from scratch and uses Corian for the insulator.

Jack.