google 2015 someboby else asking about 8e 3 speed gearbox mainshaft end float I got 3 speed gearbox look weekend think its taken out by clutch adjustment with the adjuster as for engine sprocket tap the oil seal bit more in take bit crankcase or old primary chain let wear its a long time I am building 8e in time how about fliting 9e 4 speed gearbox I seen it never gone down that road