81 ATC250R with 300cc kit on it

[ratvespa]

I pulled the top end on my 250R today mostly because it was getting noisy (piston slap), the guy I got it from said it had a 300 kit on it. well I measured it while the head was off and it was 76MM bore. Stock is 70mm, and the biggest over size anyone seems to make is 74mm. Anyone know of any sources that might have a oversize piston for a 300 kit? I might just have to get the jug and head off of ebay and start fresh. The head on my 250R is different than every other 81-82 head I have seen.

Scott

[350x'inNY]

Talk to 88TC... think he was working Wiesco on getting some made. Also look on ebay. Some takes and resleaves them to use Trx330 pistons.