was wondering if it works or is trouble, i have a peak head with 21 cc across, to much for ppipes but same as stock mag and centre, just jet up a couple on the pto, but i am wondering if it would be trouble for detonation, must be a reason why they dropped the pto to 24 cc
yamaholic22
Active member
they did that so that they could run straight jetting. Everyone always questioned the staggered jetting on the triples, and would run straight jetting anyway and the pto would run hotter, so now they took most of the human error out of it and staggered the compression and used straight jetting. If you richen up the pto you can run straight compression if you wanted.
i went up 3 sizes on the pto, you think thats a little much?i think with all the same might be a little more snappy, dont think the power will do anything
yamaholic22
Active member
start there and if it seems rich on the mains then lower it one size at a time until right. Now remember the mains only control about 3/4 to full throttle. You will probably have to richen up your needles a little bit too (lower the clip) to be completely safe with the added compression on the pto cyl.
800
New member
Well look at it this way, on an SX 700, the pto was up one size on the mains and up 2 sizes on the nozzle.