Once in a blue moon my kickstart binds. It works perfectly, but sometimes it binds/locks in the top position. Gently rolling the scooter a couple of cm in gear releases it. It happens very seldom (maybe 2/3 times from spring to now). What could be the problem here? I have drained the oil a couple of times this season and there is some tiny amount of swarf in the oil (which I suspect comes from the completely knackered clutch that I replaced with a new one at the start of the season). The bike runs fine and starts on a couple of kicks when cold.

Any tips would be very welcome.