all you have to know is that this engine needs 30 per cent nitro, because it s a low compression engine... low compression engine runs smoother, like gas engine runs smoother on cars versus diesel engines.. but to make the ignition properly, you need more octan grade... or nitromethane for a methanol fuel...
if you don t use that mix, it will stall at mid range because it will enrich...
best plug is enya n 3..
the pump setting is the screw almost shut....
as the rpm are very high, prop must be an 11/7 and the header must be shorter than for the other engine... check on mac products trim chart..

this is undoubtly the most powerful classic pattern engine ever made, and very easy to set up if you know the tricks i ve explained... and reliable...
take care of you engine, there will be no more of it s kind!!!!