today with 65f air temp, near sea level, 30in baro... finally got a good baseline jetting. FINALLY. '77 YZ 250 jug/piston modified IT 250 pipe VM38 #30 pilot, air screw 1.5 turns out #330 main 2.0 slide can't remember what needle is in it at the moment. motul 710 @ 40:1 with a good amount of residual oil after a typical jaunt. 87 octane (no signs of detonation... yet... but it's also cool out) starts cold or hot in 1 kick. rips along nicely from off idle to WOT. stoked. almost shit myself when it came on the pipe so early... it's been running smooth, but never what i thought it should be up high, until today.