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Old December 23rd, 2018, 04:52 PM   #7
jkv45
Rev Limiter
 
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Name: Jay
Location: WI
Join Date: Jul 2013

Motorcycle(s): '06 SV650n, '00 Derbi GPR, '64 CA77 Dream 305, '70 CL450 Scrambler, numerous dirt bikes

Posts: A lot.
MOTM - Jun '18, Oct '16
Quote:
Originally Posted by FluxX View Post
Alright, going to organize the BMC air filter and slowly start getting everything in order before taking it in. Will have a look at exhaust systems and see what's available to me.So you reckon something is definitely not right with the top end of this bike? Is it not possible it's running to a insufficient ratio due to the current slip on, or perhaps a sprocket has less teeth for low end torque (track purposes)
Sorry if the questions are silly.Just trying to educate myself at the same time. It concerns me if I'm not reaching optimal top speed of a stock 250.
A completely stock 250 will run just about 100 MPH.

Is your top speed in 6th gear at the rev limiter? If so, that would tell you the bike has lower gearing, but you can also check by counting the teeth. Pretty sure you should have 14 front 45 rear - but confirm for your year.

The open exhaust could be leaning the mixture enough to reduce the power.
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