|
I think the CBR250R engine could be easily detuned somewhat by reducing the valve overlap as the cam gears are friction fit with no key. They would be infinitely variable without any machine work. That engine would also benefit from shaving the head to raise the lowish compression ratio up from 10.7. The power band is already quite tame compared to the Ninja but could no doubt be better for fuel economy if some peak horsepower could be given up by changing the cam timing. The Honda also features a nice tuned runner leading into the throttle body which could also be tweaked longer once you find out what rpm you want to optimize for. The cat and quiet, stock exhaust are also holding back FE. A loud slip on muffler increases power 8-10% all across the bottom and midrange but I have thus far decided to leave the cat in place. I would love to borrow a portable emissions logger for an hour to get some idea how effective the stock cat is. Anyone starting from scratch with a ground up new vehicle could find a better, more exotic engine but as a turn key platform for light aero mods (or stock) the CBR250R is doing some great numbers at a give away price.
|