Blown head gasket

[airbraker]

Took my RD250LC out this afternoon and this happened on the motorway. What and why did this happen ? 3000 miles since re-build this was an after market gasket that came in a kit. Noticed drop in power and thought I had to switch to reserve. Van driver came along side and alerted me to an issue. Pulled over and left leg covered in antifreeze. He saw steam coming from left hand pipe. I was so lucky as this fellow biker gave me and bike a lift home. He felt bad as he was admiring it when it all went wrong !
I am going to buy a gen yam one from Norbs tomorrow but is that all it is ?

[arrow]

Thats the R/H side surley ?

[airbraker]

Oh yea shit must have had cyclinder head on back to front ! yes it was right hand side !

[lcrider]

what size piston are you running i was thinking if it was like 1.75 or 2mm is may have been to close to the side and that’s what made this happen .

[airbraker]

Yea they are full oversize. So what happens about gaskets now then I thought one size fitted all !

[pepsisteve]

get a metal gasket, the one thats made up out of three layers of steel and using a dremel make the gasket big enough to fit the piston through. thats what gerry pell told me to do anyway.

[stanlc7189]

Get a genuine Yam one. Norbo sells them at around £35. I didn't know this and bought one from Granby Motors for £60!!!! Ouch!! Not had a single problem with leaks or blowing and , apparently, you can re-use them.

[airbraker]

Norbs is out of gen Yam gaskets asked already !

[Deleted]

i was told that i didnt have to dremal out the metal gasket to fit o/s pistons because the piston doesnt go high enough, have i been told the wrong thing,thanks