Today while going down a long straight my 97yz125 seemed to like cut out and or hit a false netural when shifting up to 6th gear. It seems on this bike the higher i rev it the better it shifts? Some times when shifting from 3rd to 4th it will drop back to 4th. Im using bel ray gear saver and this stuff after like 3-5 rides comes out like it went in, just seems a little thinner. the yz shifts notchy. My 96cr250 shifts smooth as can be but when i drain the hp2 tranny oil it is black. Could the gear saver i am using in the yz cause the lously shifting? Like it is too thick or something? Im going to try hp2 tranny oil in the yz but for the mean time does anyone have any input? Also when you are short shifting an engine or spinning the rear wheel then you shift and the wheel hooks up, could this cause the bike to drop back down a gear or something? like if the engne is not reving enough to hold that gear bec of the terrain change/gear ration change- loss of engine rpm?