[saikamaldoss]

I heard no one talking about ignition timing valve timing etc..
if you are into race engine tuning etc.. the fist thing you do is cam and ignition timing modification.

CBR250 10dig is the timing at BTDC and for CBR150R it is 12Dig BTDC. and cam needs to be adjusted and will really rock.. and Advance is 34Dig

 

[saikamaldoss]

40bhp on crank is very much possible.. first you replace the 37mm TB to 44mm or 47 mm and rework on the port after scanning in Xeray for water packets etc