This is the opinion, of the new CRF300s, of a chap who has built a couple of CRF300s himself.


found some info on the new gearbox and done a bit of comparason and it looks pretty good tbo im pretty used to the 13l 17l and 300 engines and gearboxes
one of the reasons i left the 300 gearset in is that it has a lower 1sst and closer ratios 2 to 5 with 6 being under the 250ls ..it easily allows a 15t front sprocket to work where as a lot of lads go 13 on the Ls ....a 13 on the below gearset trust me would have a fair bit of zest in it ...14s pleaty on the 300 for trail riding and 15 will work too

..the ratios on the cbr motor work really well that bit closer together and with a fairly big precentage more tourque and power slightly closer ratios it really is quite nippy to 60 ..what you notice straight away is there isnt any turbo lag waiting for 5.5k to arrive it just take the next gear and goes again ..so its a combo of several things 7hp touqueand gearset that make noticably more responsive

heres the good news the new 1st is slightly lower than the cb motor which in turn is a bit lower than the crfs
..gears 2345 are identical to the cbr motor which is good not silly short at all but each gear moves on from the next really nicley and the new 6th it taller than the existing one ...,,,it does look pretty much on the money and i think 14/40 will be ace at both ends with a slight suspision the gap to 2nd will still be a tad too wide now and again

..i think the days of 13t fronts will be over on the new 300 ..i think that box will work very well

1st gear: 3.538 3.538
2nd gear: 2.25 2.25
3rd gear: 1.65 1.65
4th gear: 1.346 1.346
5th gear: 1.115 1.115
6th gear: 0.925 0.925

dividing ist by 6th gearspread is a pretty high ranking 3.82 ....if they get the delivery right from the motor it will be a handy machine for sure