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Right on Al. We've stopped using popup pistons......mainly because we gain better control over the exhaust and transfer timing by lowering to jug and cutting the squish band. On the MS660 and later models of the 390XP that comes in handy because the exhaust is just too high on those saws for a...

I used to open the piston windows and spend some time blending and smoothing inside the piston.......but I don't bother anymore. I've found much more gain in transfer port shape and compression increases.

No worries Kevin. I've been meaning to get back over here for awhile now......we've just been slammed in the shop these days.....not much time for surfing the net. I'm easy to find ya know. ;) I don't do any piston mods on worksaws.......as a matter of fact we rarely remover the clips...

Same saw crosscutting..... <object width="420" height="315"><param name="movie" value="http://www.youtube.com/v/PzIBP_mWQNM?version=3&hl=en_US"></param><param name="allowFullScreen" value="true"></param><param name="allowscriptaccess" value="always"></param><embed...

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I've modded 10 of them already. They make way more power than a 460....with more torque over the whole power range. One of my customers is running a .404 8 pin setup. One thing about the 461 is that they don't sound as racy as the 460 when modded....that leads some guys to say they don't make...