Man! what a improvment, I installed a UFO slide insert in my 74 yz250, and this thing really came to life on the bottom and mid! best money I have spent by far. $30.00
I had to go up two sizes on the slide cutaway from, 2.5 to 3.5, needle in the same as when I started, and then you have to drop the pilot 50%!!!, I had a 50 pilot, and went to a 25 pilot, the throtle responce will blow your mind.. this is a A++ improvment.
They say 1 hp for every 100 cc of motor, on the bottom and mid, not much change on the top, as the slide is out of the way by then.
I had to go up two sizes on the slide cutaway from, 2.5 to 3.5, needle in the same as when I started, and then you have to drop the pilot 50%!!!, I had a 50 pilot, and went to a 25 pilot, the throtle responce will blow your mind.. this is a A++ improvment.
They say 1 hp for every 100 cc of motor, on the bottom and mid, not much change on the top, as the slide is out of the way by then.
