TT250 47 vs 50 rear sprocket

[mtiberio]

Got my 47 installed today. Initial test ride confirms a reduction of about 500 rpm at wfo (65-70 mph) speeds. No increase in top speed, just less rpm. Good indication that the hp curve is flat up there. I like it, lower gears feel much less tight, acceleration seems un affected. 47 vs 50 is 6% taller. Confirmed when what was 8200 rpm (~66 mph) became 7700. Bike felt like it could run all day at 8200, should only be better at 7700. Eventually I'll report MPG.

[Ariel Red Hunter]

Originally Posted by mtiberio

Got my 47 installed today. Initial test ride confirms a reduction of about 500 rpm at wfo (65-70 mph) speeds. No increase in top speed, just less rpm. Good indication that the hp curve is flat up there. I like it, lower gears feel much less tight, acceleration seems un affected. 47 vs 50 is 6% taller. Confirmed when what was 8200 rpm (~66 mph) became 7700. Bike felt like it could run all day at 8200, should only be better at 7700. Eventually I'll report MPG.

I've forgotten what you have done to your bike. Is it stock, or with a different carb and exhaust system, and an opened up air box? 66 is a little slow for a breathed on 250.

[mtiberio]

Stock muffler and intake