I have a Gordon'ed '99 XR400 with the following: Snorkle out Uni with cage Header ground flush Jetted 52/155 Float set 14.5 mm/19 mm A16A needle in middle position Krizman Magnum exhaust tip Denso Iridium IX24 plug Phillips 91 octane fuel Honda 20W-50 75% synthetic oil with moly Dunlop 756 tires F/R 14/45 sprockets Got a chance to run on a dyno and got this. The dyno numbers were corrected for atmospheric conditions, but not for drive train losses. Temp was 91 degrees, low humidity and 5,300 ft elevation. The run was made in 3rd gear. The Uni had about 3 rides since last cleaning, so it was a bit dirty. Max power is 26.3 HP at about 7,000 RPM. Max torque is 21.2 ft.-lb. at about 6,000 RPM. The air/fuel ratio measurement indicates lean below 7,000 RPM and slightly rich above. At idle with the pilot screw 2-3 turns out, the air/fuel measurement still indicated slightly lean. Time for a 55 slow jet.