hey guys just wanted to let you know i finaly got to run my ptm .21 3 port race engine on the track last night and was very pleased. although i got a major lean bog on bottom after couple mins running. i then figured out that for some reason it just did not like my pipe i was running. i originally had the go 2047 and it kept choking the motor on bottom so i went back to good old faithful dyn 053 and it ran awesome. temped around 250-260 man i was very happy after that. thnx brian and ptm im very happy with the engine. thnx will g