Scooterotica

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 !

Thanks Shocky, the parts will be here in the week. I will take out the main jet and have a look.