Honda CBR600F3**True Rear Wheel HPtmTrue Rear Wheel HPtm
Shows difference between stock and +4 advance on THIS CBR600F3 - comp exhaust">
Honda CBR600F3**True Rear Wheel HPtm
Shows difference between stock and +4 advance on THIS CBR600F3 - comp exhaust,
CRB-H71-17-RK RaceKit, only!
Question:
Is a +4 advance a good addition for this particular modified bike?
Answer:
Yes, on this bike, we'd use the +4 degree, usually. A dyno shows that there are minor
power changes, less than 1hp here and there when at full throttle, but at part throttle,
(not shown on this chart) power is increased at nearly every rpm - at every throttle position that is less than full throttle.
That explains why a rider will say that the bike feels quicker and pulls harder out of
corners - because it is quicker and does pull harder - they are not at full
throttle - even though a dyno says there isn't a power increase.
A +2 degree advance generally wouldn't lose any power at any rpm at full throttle, but the
part throttle power wouldn't be increased as much. Generally, if you feel an unacceptable
amount of power loss at high rpm while riding, you would avoid the power loss by retarding
the timing in usually 1 degree increments until power picks back up.
Question:
Does every model of motorcycle react to timing changes the same way?
Answer:
No. Some pick up or lose power at different RPMs with more ignition timing lead, but most
all have improved power at part throttle settings.
Call if you need more info. Thanks, Marc
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Maybe in next rewrite, he'll fix the ignition timing and dyno chapters... Otherwise great book with great starting ideas. |
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My bible |
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The little blue bible for quick references and little known facts. |
