Because the power band of the cam has it's peak at a lowish, 8,800 rpm, you will be losing some of the meager top speed the CBR250R comes with, the shorter you go with the gearing. The Ninjas will already blow right by you now on any track with a straight away. With an exhaust for an additional 1.5 hp, and longer gearing so that top speed occurs at 8,800, we should make a big gain in top speed.Yeah, i dont want a smaller sprocket. this is a race bike from day one. it only has dyno miles so far, but i know the stock gearing is going to be way too tall.
Well, I see you have your heart set on winning with the Honda and I would be very happy to read about your project. Please keep us posted.youre not going to want taller gearing. im pretty sure the bike isnt going to pull to redline in 6th gear. and all this talk of not being able to keep up with ninjas is bullshit. our race prepped ninja that we've been winning endurance races on all year with a pipe and jet kit, only made 28 hp and 14 ft lbs.
our brand new CBR on the very same dyno, back to back made 24 hp and 15 ft lbs, bone stock. with exhaust, fuel, no airbox and MR12 fuel, it WILL make more than 28 hp. It was also 21 lbs lighter in full showroom trim than our race ninja.
the bike will need at least a 40t rear.
I'm a relatively new rider, can you tell me the indications of too-tall gearing? thanks
The CBR250R is currently geared for 104.5 mph actual at 10,500 rpm according to my experience with the actual tire circumference of 77.00 inches at gearing commander. I am currently topping the stock bike at 93 mph actual and 9,400 rpm.well as far as racing goes. too tall means poor acceleration out of corners. you shoul dbe able to reach redline, in top gear on the track's longest straight.
the bike is currently geared to theoretically go 137 mph...obviously, thats never going to happen.