My best guess is for a stock dirt bike, the BMW HP2 Enduro. It puts out 105 hp at 7000 rpm. The following is a excerpt from a 10 day test of the bike by motorcyclists-online.com:
The HP2 is a true gravel rocket and the ultra strong engine is good for some indecent top speeds off-road. It can easily do 125mph, truly a break neck speed off road.
If were talking pure mx bike, KX500 or CR500.
None, they all suck.
4 stroke
No we can't use 100cc 4 -stroke dirt bike race against 85cc dirt bikes.
A 2 stroke.
the fastest dirt bike in the world is the 250 4 stroke engine out boarded with cases it does about t hundred on the straight
depends 2 stroke of 4 stroke and racing bike or a trail bike
It's a two stroke
All of the Orion bikes use a 4 stroke engine.
For the same engine size, it should be.
No
100hrs
92 octain