Hard to believe the dyno sheet posted as I have a new OEM top end and 927 top end sitting side by side on the bench, run through and compare all ports from OEM to the 927, all port height is the same as a stock 850 with the exception of the rear port in front of reed valves is 1.5mm lower, so where does this magical 192+ HP and 132+ Trq come from? so here is what I found for fueling on the 927 and what finally made it run. Y pipe light coat of oil and dark brown, main pipe light coat of oil for about 10 inches turning to a light dry brown through the rest of the pipe, fueling I used for the last 950 miles----- Stock!!!---AFR#s at WOT 13:1, wash on pistons now that it is apart about 5/16-3/8 of an inch, this is the only way my 927 would run down the stock 850's if they got the jump on me. there were more side by side comparisons with this sled than any other I have owned trying to get it to pull like it should, add fuel and there is no catching the 850"s