they keep playing with magnesium, every year technology advances and we are able to manipulate aluminum more, many frames area aluminum/carbide combo they can make the metal more rigid, and reduce ID of tubing and still have a frame with the same crush weight. They also are playing alot with the way the engine is, They have talkin alot of weight out of the tranny, theres alot of TI in new bikes
for horsepower. theres only so fast you can spin a single 4 stroke without the harmonics going frikin wiggy. I know they will make more horsepower then 60, but its keeping them living. The pistons are so light and have no sleeve's that basically the rings are the onlything balancing the piston through the stroke...means no bueno for the rings.
86 ATC 500R the duner..
85 ATC 500R...the not quite finished faster duner
1985 ATC 250R Bone stock!!
1985 ATC250R mx/duner
1986 TRX370R MX/Duner
94 Banshee 400PV Cheetah 105RWHP