k14
3rd December 2009, 14:27
Racing my bike at the burt munro on Saturday. Go out for qualifying, bike running great, take pole by 1.6s and pretty confident about the days racing. Go to start the bike to form up for race 1 and it is a little hard to start and sounds a bit rough. On dummy grid I notice a bit of smoke so call it quits and go back to pit. Strip bike down and find a plug is fouled. Give it a bit of a clean, start back up but still smoking. Call it a day and come home.
Borrow a compression tester from a mate, cyl 1 90psi, other two are 145 or so, pretty consistent. Not sure what has caused the drop of compression on #1 so only thing to do is drop engine out and take head off. Major signs of scuffing on the bore, not sure what has caused that (ring failure?) but also sign that the piston has been touching the head (left side at around 9 o'clock) and also a small mark where the left side inlet valve has just touched piston lightly. This could indicate something worse, maybe big end?
So next step is strip the bottom end. Oh joy, what fun. Looking at whole new engines or bottom ends. They are fairly common on ebay and in the states. Just a matter of finding some money (hello mr visa), getting one here and fitting it up within the next 6 weeks!!!! Should go back to a 2 stroke, at least ACC pays for the damage they cause when they go bang :laugh:
Borrow a compression tester from a mate, cyl 1 90psi, other two are 145 or so, pretty consistent. Not sure what has caused the drop of compression on #1 so only thing to do is drop engine out and take head off. Major signs of scuffing on the bore, not sure what has caused that (ring failure?) but also sign that the piston has been touching the head (left side at around 9 o'clock) and also a small mark where the left side inlet valve has just touched piston lightly. This could indicate something worse, maybe big end?
So next step is strip the bottom end. Oh joy, what fun. Looking at whole new engines or bottom ends. They are fairly common on ebay and in the states. Just a matter of finding some money (hello mr visa), getting one here and fitting it up within the next 6 weeks!!!! Should go back to a 2 stroke, at least ACC pays for the damage they cause when they go bang :laugh: