I’ve just put in a new starter motor into my Mk111 Commando. When I try to start the bike the starter motor turns & the sprag clutch won’t engage. I’ve pulled the sprag out & cleaned it, it’s only been recently fitted & doesn’t appear to be damaged in anyway. Once everything is reassembled the electric start will often work for 2 or 3 starts then just won’t engage. If I kick start the bike & ride for say 1/2 hr & things are nice & hot, the electric start works perfectly with the sprag engaging, but once cooled down we’re back to non-engagement. Any ideas on what could be causing this?