Originally Posted by Maximo

that castor makes the engine easier to tune as it seals the crankcase better......... IMO it is the best fuel money can buy........

what are your issues ?

okay I just read your issues I am going to say the issue is with your tune and setup and not with the engine..... stalling off a jump is chassis flex, flywheel scrubbing or too low of an idle .........

unless of course you have ingested dirt and knackered up your engine..........

what glowplug are you trying to run ? what diameter of clutch and in what chassis ?