P2 piston
I've been working on a mates P2 today. It packed up on the way to Exmouth last weekend. After a quick look the piston is holed and the sides a little scored. The scoring looks like the normal wear and tare I'd expect from a high mileage rally goer, but the hole is a worry. The only thing I found was the head had been leaking, would that be enough to hole the piston guys ???? The scooter is bulk standard except for a PM tuning pipe. I hav'nt checked the main jet size yet, what should it be ???
standard jetting is 118 and oilinjection models have a 116
looks like its seized several times as well this head was on a standard p2 that had a jl pipe fitted and siezed several times so went to
****sp**d to be dynoed and came back with a 135 main jet in it
and £120 lighter 
and was told it was running rich the next outing it went tits up again then came to me i said whats all that oil dripping by the cowl 
i lapped the head down and rejetted
http://scooterotica.org/forum/viewtopic.php?f=8&t=10714
runs sweet now 2 up flat out with a 123 main
QUITE HOW AN EXPERIENCED DYNO OPERATOR WOULD PUT SUCH A LARGE MAIN JET IN AND NOT REALIZE THERE IS A PROBLEM IS BEYOND ME !
looks like its seized several times as well this head was on a standard p2 that had a jl pipe fitted and siezed several times so went to
****sp**d to be dynoed and came back with a 135 main jet in it
and £120 lighter and was told it was running rich the next outing it went tits up again then came to me i said whats all that oil dripping by the cowl i lapped the head down and rejetted http://scooterotica.org/forum/viewtopic.php?f=8&t=10714
runs sweet now 2 up flat out with a 123 main
QUITE HOW AN EXPERIENCED DYNO OPERATOR WOULD PUT SUCH A LARGE MAIN JET IN AND NOT REALIZE THERE IS A PROBLEM IS BEYOND ME !
We sleep soundly in our beds because rough men stand ready in the night to visit violence on those who would do us harm
Thanks Shocky, the parts will be here in the week. I will take out the main jet and have a look.