BLACKeR

Member
Oct 30, 2007
76
0
hey guys, new to bikes not to 2-strokes. i just bought an 01 cr 250, this will primarily be a woods bike both single track, and open quad trails. i want to boost the bottom end and try to smooth out the midrange hit. ive searched here, and on other sites on this topic. i still have some unanswered questions. my current mods are SST pipe, and boysen rad valve. 10 oz flywheel weight is in the works. ive read a lot about the thinner base gaskets. im not too excited about that. it seems like the compression would be minimal. i think it would just be better to have your head re-cut. how much compression is normal for a woods bike. i realize monster compression could be a PIA kicking it on an already difficult off camber. for those that have actually tried the cometic gasket about how much extra compression could you expect. i assume stock is in the 180ish range. i appreciate any advice on this or any other simple low end power tricks i may be over looking.
 

allthingsdirt

Member
Jun 6, 2007
94
0
Congrats on the bike. I bought the same one in May of this year and I love it.

When I first picked it up it was a slug in the low revs. Did some research (on here) and realized this particular model was jetted WAY too rich from factory. I had to go one size smaller on the pilot jet and switch to a s-7 nozzle. After that it was like a whole new bike.

Good luck.
 

Redrodent

Member
Jul 31, 2002
58
0
The thinner base gasket is also for retarding the port timing, moving the power down the rpm range.

You could try also advancing the timing a little

Most likely that 10oz FFw will do the trick
 
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