[749er]

Well you can tell I have too much time on my hands at the moment so I spent some of it workin the following out.

I read in another post about how 749's are overpriced/underperform in comparison to jap bikes, and that they are not good value, and that some in the bike press feel they are underpowered etc. Part of this comes from the fact that in line 4s post much higher maximum power output figures than a 749. As most of you will know its not really power that counts as it is a function of torque and rpm, so the greater rpm you can run to, the more power you will have. Lower revving v twins are always therefore going to produce less power. They do however produce torque by the spade load.

So, before I start, yes this is very unscientific and of no real value, two different dynos, different locations, maybe different altitudes, temperatures, grade of fuel etc, but what the hell, its an out of interest comparison. Be interesting to see some more accurate data from other bikes. Could we have a dyno graph section where we can post results?

What counts is not a peak fugure as you dont ride about at 136bhp, what counts is the area under the torque curve. So I compared this for a 749 (rated to be 108bhp stock), with termis, no power commander and a Kawasaki, Zx-6R (636cc rated to be 136bhp stock) but with full akropovic and and a PC111.

Both power figures above are calculated at the flywheel for a stock bike.

Measured at the wheel for modified bikes the bhp figures were

KWAK (full akropovic system, pc111 with custom map)- 116bhp
749 (asymmetric termis, no pc111)- 103bhp

So by this one figure method of comaprison, there is a big difference. But when you integrate the area under the torque curve the Kwak is only 3% ahead, and this could well be reduced/eliminated if the 749 had a PC111. The 749 torque curve looks very choppy in comparison to the Kwak, so a pc111 is likely to be a big help.

Areas under each curve were calculated between 4000 and 11000rpm for the 749 and 7000 to 14,000rpm for the Kwak. So a 7000rpm power band for each

Given the close result, I would guess that this is why 749's run against 600cc in line 4s in Supersport series, ie why they are allowed more CC

I will try an post the graphs up. Be interesting to compare a 999S with an R1/GSXR1000