Faded
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- Jan 7, 2003
- 842
- 0
I'm currently helping a new riding buddy that just picked up the sport by purchasing a fairly used 1999 CR250. He has ridden it a couple times and says that he's intimidated by the abrupt midrange hit. It has a few minor flaws that we'll be attending to and at the same time we'd like to do what we can to increase bottom-to-mid power and try to smooth the hit/delivery as much as possible to make him feel more comfortable. It seems that the normal modifications used to reduce hit also contribute to more top-end power, i.e. retard ignition timing, double base gaskets to alter port timing and reduced compression, etc. I'm looking for opinions on how bottom-end boosting modifications will affect the hit, i.e. shorten silencer, raise compression/reduce squish (by milling the head), dual stage fiberglass reeds, etc. and if there is some combination of the above ideas (or any others) that might work to help add to the bottom end while smoothing things out for him. Since he just bought the bike big money mods aren't really an option.
We'll be going through the top end to make sure it's fresh and that the power valve is clean and working properly. Also we'll be replacing the crank seals (left side leaks). The bike is stock except for an FMF Fatty pipe. Any help or ideas are appreciated, thanks.
We'll be going through the top end to make sure it's fresh and that the power valve is clean and working properly. Also we'll be replacing the crank seals (left side leaks). The bike is stock except for an FMF Fatty pipe. Any help or ideas are appreciated, thanks.