[mbarryracing]

Here is a 300 foot comparison of the FPP clutch kit with the stock 15 tooth front sprocket against the FPP 14 tooth sprocket that is offered as an option.

Note: We dropped back from 500ft to 300ft because we weren't seeing that much increase in MPH beyond the 300ft mark in the previous testing, indicating the clutches are pretty much shifted out and the acceleration is flat-lining after that with the engine just revving out. This explains why other brand 250's with manual tranny's out run the DS250 in 500 ft, the DS runs out of gear ratio well before that but surely can give them a run for their money in a 300 ft burst, though.

Due to noticeably increased wheel spin, the 14 tooth front sprocket with this FPP clutch combination only picked up 0.03 seconds in 60 ft and barely 0.005 in 300 ft on the lights. It would be quicker with better traction, via playing with tire pressure, shock pre-load, etc, but we stayed consistent throughout testing with the same track conditions we first started with.

What this data demonstrates is that it doesn't lose any ET (elapsed time) by gearing it down a tad ( as we had feared ) but actually gets to this 300 ft finish line quicker, even with more wheel spin...
Although it might give up 2 or 3 MPH when tapped "all-out" down a fire road, etc, the 14 tooth front sprocket is definitely snappier and more fun so I'll be keeping that sprocket on for the wife for our type of trail riding.