Renthal also furnishes the sprockets, with Gieger sharing, “For moto I usually go up two [teeth on the rear] from stock, which is . I just like that pull of second gear out of the turns. I’ve always done that on every bike I had, but in off-road I run stock [gearing] just to get the faster speeds on the straightaways and get everything I can out of the little 250F.” The countershaft sprocket size is the standard 13-tooth, and D.I.D’s ERT3 X-ring chain connects the sprockets with a BRP chain guide keeping things running correctly.
Twin Air not only is the air filter company of choice, it also provides the plastic louvers to add a degree of protection for the radiators. An Acerbis plastic skid plate keeps the engine cases and bottom of the frame from all but the most damaging hits.
In the CRF250R-derived engine, the JCR team runs VP T4 race fuel. Mapping is stock, Gieger noting, “I always used to remap the bike to lean the bottom to get a little more snap and put a little more fuel up top so it would rev higher, but this year, I’ve just been running the stock map, map 1. I noticed last year when we tested, what I really liked when I went back to map 1 wasn’t a whole lot different, so I didn’t really stress about it this year.
“If we get into real technical, rocky stuff, I know map 2 is a little more mellow and it’s pretty nice because it has more bottom. Then if we have really high-rpm fast stuff [at an upcoming race], [I like] map three. It doesn’t have as much bottom—they put [the power] up top—so you need to rev it out longer. The stock maps have come a really long way since they started with fuel injection.”