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Polini Thor 250

It is a good idea to check Polini's website to get the latest (or additional) information.  If you find errors here or things that will help other pilots, please contact us.  We try to be as accurate as possible.  However, the marketing departments make this task difficult and sometimes impossible.

Carburetor 28mm throat diameter, main jet 118 (according to Polini but could be something else, however).  It is more like the Bing carburetors.

Cooling system 1

Cooling system 2


Dual spark plug parts

Dual spark plug wiring diagram

Electric starter parts

Engine parts single spark plug

Engine parts dual spark plug

Frame mounting parts

Fuel system parts

Spark plug – Champion RN2C  gap 0.023"-0.028" (0.58mm - 0.71mm)  Polini does not specify the gap value in their engine manual.  The value here is
     from Champion's technical site.  I suggest that pilots use the lesser gap value because of this engine's high compression.

Thermostat parts

User manual (single and dual spark plug)

Wiring diagram