Phil,
I have neither a chain drive or 191 RWHP .. but as we discussed before
.... If you wanted to emulate the gearing on a stock max ... you would
have to equal the middle gear ratio, (21/27 ... .778 .. which is gone
now due to the chain drive conversion), times the rear end ratio,
(33/9 .. 3.66 ... which is also gone), or a ratio of .285 ......
Soooooooo ... since you have a front sprocket with 13 teeth ... you
need a rear sprocket with 37 teeth to equal the current drive ratio.
Considering the tremendous torque this motor has .. you might be wise
to start with a similar setup. With this gearing, (and assuming for
the sake of computation a 12.47 inch rolling diameter ... equal to
stock), you would be doing 134+ at 9900 RPM in 4th gear ... I am
assuming also that you want to finish the 1/4 mile while winding out
4th gear ..... If you think this is too loose then make that a 36
tooth sprocket ... that ought to cover it ... (again .. this is
assuming a 12.47 rolling diameter tire and not taking into
consideration any swell).
I would not think you would need a trememdously high launch RPM with
this engine ... I would be shocked if you weren't fine at 5 - 5.5K
........ Of course .. a big factor here is the rear tire ... there are
three Goodyear 18" motorcycle slicks ... if you are doing a slick then
I would think you are going to put wheelie bars on here ... If not
then you are going to have to launch very modestly to get hooked up
before you turn all that throttle lose ... in fact I would be suprised
if you wouldn't be able to lose the rear end at will with a standard
street tire ... well down the track ....... Without a slick you might
simply hit a wall on the 1/4 times .. as it will become more a matter
of keeping the bike going straight than anything else ... and it would
be extremely difficult to deliver all the power this engine has at
it's disposal ....... IMHO ... as always .....
campbell
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