ok.. got my 06 ds 650x and went riding this weekend.... keep in mind ive been riding dirt bikes for awile(this is my first quad)...
and this thing rocks!!!! a ton of power and a very nice ride... handles very good, you can through it around like a dirt bike... and wheeles
very nice to... and its still stock???? got a tm 45, exhaust, ported intake, air filter and 60% cluch springs and some 22 and 23 inch razr 2s and a
15 tooth frount cog coming for it.. so whats this thing gonna do ,rip my arms off??? what can i expect over stock???? a couple ? though...
i cant beleave that the ds makes more power with the air box cover on or sealed up with them them tubes running under the fuel tank???
coming from 4-stroke trail bikes you open up the air box by cutting the top off to let it breath , and re-jet the carb. another thing is why dose bombardier
say to use premium fuel, in a moter with 9.7 to 1 comp. , your loseing power ????? its not going to ping on 87 reg. gas......
other than that , the ds rules......

 

I ran 87 in my stocker for 2 years, ran great! Don't know if you'll need the 15 tooth front. I know on mine that the taller I gear it the better it perfrorms. It doesn't feel it from seat of the pants because you're going through the gears quicker, but I could tell from some of the races by how much I was beating some or at least a lot closer to others.