My 07 ec300 has the RB head and carb mods and rips on top end. Last Friday I drag raced a friend who has a nearly new yz250 that is tuned really crisp. We ran side by side through the first 5 gears. My gasser has 50 more CCs but it also has the heavy enduro ignition, 4 year old reeds, needs a jetting change , and was pulling at least 50 more pounds down the road. We topped out 5th gear side by side then I walked away from him in 6th. RB does good work.
p.s. My gas mileage went up 5-10% after the head mod.
|