The new CRF250R’s are fuel injected and a complete new engine. Travis at Thumper got one to 280cc with a big bore and a stroker version out to 300. We did the 264cc version here. Tested one day at racetown and one at Piru and had about eight different test riders all love each of
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Tom Morgan at Hot Cams came up with great cams and mapping to put this mod on top of MXA’s mini-test a few months back!
We tried for the last national but go hurt so had to go Johnny Jeldera.
Last year we went for the 470 big bore but this year we kept it stock bore and hit a homer with this full CV4 mod.
Check out this cool Motorcycle USA tire change video we just did during shootouts. http://www.motorcycle-usa.com/708/Motorcycle-Video/Dunlop-Tire-Changing-Guide.aspx We had a great time making it and I hope you find it useful.
Dirt Bike Ron Lawson, Tom Webb and Adam Booth all enjoyed my 4 250F 2mm over project at Racetown
Here is a video that demonstrates how to change a tire on your motocross bike.