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Gearbox is probably over filled. The smallblock six speeds are reluctant to drain as I found out when I did the first service on Craig's bike. For whatever reason I didn't get all the oil out and because there is no level plug I simply added 1/2 a litre of new oil. It ended up with far too much in and spewed it out of the vent with considerable vigour!Drain it overnight with the filler cap off and remove the gauze filter from under the drain plug. In the morning reinstall the filter and drain plug, fill with an accurately measured 500ml of gear oil, reinstall filler plug, go ride.Pete