Valves should be set to the thickness of a good quality buisness card! I use sae 140 in my gearbox,I have read you must not use lard or windmill oil! to change gear,squeeze the valve lifter and "feel" it into top,changing down is a little more tricky and if you are stopping it is as well stopping in top on the valve lifter,if you really need first then just shut the throttle a little and with a quick pull on the valve lifter pop it into first.Dont let it worry you,get a little practice,Im sure the squaddies in france gave them plenty of hammer with no real problems.Keep your trouser legs out of the chain!phil.