Hi, just signed on, and this site is bloody awesome... though lets get to the point.

this is the first bike ive decided to actually look into, basically because ive had to.

i own a 1987 Honda NSR250, MC16.

I ran the bike 2 tanks without oil, and you guessed it shes lost compression in the left exhaust. i know this because i put my hand at the back of the exhausts to feel the air flow and the left is FAR less than the right.

so, and many thanks to your site parts manual, i have managed to get right down to the cylinder and expose the piston.. i have to add the mc28 rebuild section helped tremendously removing the cylinder.... anyways...

what i would like to know is, how i can tell my rings arew buggered?

i can scrape about a 1mm thick layer of carbon or whatever it is from the top of my piston.

there is oil leaking from my exhaust gasket/seals and 150mm of oil leaked from my left exhaust when i pulled the silencer off.. also i noticed oil at the top of the piston, above the rings. the oil is a very black color.

also every time i wish to start the bike i need to clean both spark plugs.

i have not ordered parts yet as im not fully sure what to order, my knowledge of engines is very minimal but slowly getting there thanks to this site.

i believe i need the mc16 topend rebuild kit. any suggestions help would be much appreciated, thank you.