TRI-Z big bore! from c12 to pump gas!!!!

[MOTOMAX27]

Today I went from running full vp c12 to 93 pump. I was in shock my z ran better with pump gas. with 23cc dome i was at 230psi with 25cc dome i was at 220psi and now with the 28cc iam at 180psi. it is running alot better with 28cc dome.

[Bryan Raffa]

I need to get a new 28cc... mine took a hit in a meltdown... thanks for the numbers, mine currently has the 23cc on race gas,,and then again I dont have a big bore...

[MOTOMAX27]

raffa what a big difference. why is that maybe timming??? now you feel the power band hit. maybe squish band??