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« on: March 02, 2014, 07:34:45 PM »
The old man and I have a puma and a psi 425. The psi we found worked the best with the sheara puma inframe pipe. We also use 48 mm lectrons carbs. The dial dome we set it to make and it was 13/1 compression so we got our builder shave and reshape the doom to 14.5/1 for race gas and have not touched it sines. Same guy ported my puma as the old mans psi and they were dynoed on the same dyno. The psi made 68 hp and I can't remember the torque. My puma with the CPI pipe made 75hp and I want to say 46 ft pounds but I am not positive about that. Needles to say the last time me and him were racing in Oregon from a rolling start he would cheat and leave before me. By the top of 4th gear I was always 3-4 bike length in front of him. We found with the psi the biggest thing holding it back was the psi pipe. We went from like 61 or 62 hp to 68 with matts pipe. We also picked up 3or4 hp going from a 39 pwk to the 48. Also this dyno is hard for number. In the sled world stock sleds are reeding 15-20 hp less then you reed on the internet.
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