Ok, I'm looking for advice for my EX 570. I've acquired a few more parts in the last couple of months, and am looking for the best way to get the little pick-ups to the snow. Here's what I'm running:

Stock internals
PSI single (hope I didn't snipe it out from under anyone here)
modified y-pipe (20mm shorter - recommended for stock motor)
cold air intake
38mm flat slide carbs
YVXC primary
Hymark roller kit for the secondary (secondary from a 95 Vmax)

Dynotech says this pipe made 86hp @ 7250RPM on a stock '91. In '89 they dyno'd the y-pipe mod alone as a 6hp increase on a piped & ported engine. I'm hoping to be in the low to mid 90's with what I've got (pipe, y-pipe, carbs, & intake). That puts me in around stock Vmax 600 power, but at least 500RPM lower than most set-ups I've seen.

Anyone run a similar setup "back in the day" and care to throw out suggestions (spring & weight combos)?

Angus