Changed the detent spring on the gearbox and it made no difference at all . So in the market for another gearbox if anyone has one ?
On a brighter note put 20l of diesel in the tank than added 100ml of 2 stroke oil and took for a 12 mile run....conclusion is on tickover the smoke coming out of the exhaust is 1/2 to 3/4 less than before !
I fitted a rather gay looking Mantec snorkel!