D&D Preformance offers a pipe for the scrambler and predator 90 for $217.00...It is suppose to make a big difference....

 

Most mini quads call for four ounces in trans. They do not take trans. oil of any type put 80 or 85-140 wt gear oil I have run my sons vent tube up the frame and back down to prevent water from entering the trans. When I change his oil I overfill it a little and the vent tube will vent off excess oil until it finds its own level.As for hop ups I run a D&D pipe ,transmission mods ,unifilter, oilinjection removed. Here are a few websites for hopups
wrhracing.com
trinityracing.com
dirtrides.com
miniquadracing.com
hetrickracing.com
And check out the others /mini quad forum for some Ideas ,just about all two stroke Miniquads have basically the same motor and trans.set up so most parts interchange