Hi,
I tried doing an oil change on my GN125 but a spring and pin also popped out of the oil drain plug. I have no idea the order to put them back in (I did spring,pin then plug bolt) but now an annoying knocking sound and think I've killed it....HELP
You've dropped the spring and neutral stopper by removing the cam stopper instead of the sump plug. I've done it myself, they go back in pin facing up, then the spring then finally the plug screwed in behind them.