Rabbit, you need to finish break in then. Sounds like the person tried running engine before breakin complete - didn't like performance and sold it. she will come alive once you have broken it in Nice work ! (hahha thats funny you read my message about that ebay advert )

Brain, Yeah it was a Sirio TRP PRO .12 (3port), conrod bushing wore terrible and carb turned to junk in around 6 months (others have experienced this - see the sirio thread). I believe STS is MUCH better quality. My Piston/Sleeve is still fine though, might ebay it $1NR.. lol..