I have spent (as well as the Keefer Inc. Test Riders) a lot of time testing gearing on each machine on several different types of tracks. We did our evaluations on tight clay based tracks to flowing sandier based type courses. Since the word “gearing” is in the subject line in a lot of my emails, I thought I would condense some of the best gearing specs we have come up with for our 2019 test machines. We DO NOT however just change the gearing for the sake of changing the gearing like some other media testing outlets, but if a certain bike does need “one tooth” or more we will most certainly recommend that gearing. These gearing specs are for stock engines and/or with aftermarket mufflers. If you have engine work done to your bike chances are you could change gearing on a few of these machines. As usual if you have any questions we are here to help you. Email kris@keeferinctesting.com and I will be happy to assist you.
Yamaha:
YZ250F: 13/50 (Stock)
YZ450F: 13/49 (Stock)
Kawasaki:
KX450: 13/49 (Helps third gear roll on out of corners)
KX250: 13/50 (Stock)
Suzuki:
RM-Z250: 13/50 (Stock)
RM-Z450: 13/51 (Helps pulling power down low on deep tracks)
Honda:
CRF250R: 13/50 (Helps lengthen third gear pulling power without sacrificing second gear roll on)
CRF450R: 14/52 (Helps free up rear end feel of this stiff natured chassis)
KTM:
This set up on all three bikes will help settle the rear end out of corners, will set your rear axle further back, and help 2nd-3rd gear transition.
250 SX-F: 14/53
350 SX-F: 14/53
450 SX-F: 14/52
Husqvarna:
This set up on all three bikes will help settle the rear end out of corners, will set your rear axle further back, and help 2nd-3rd gear transition.
FC 250: 14/53
FC350: 14/53
FC450: 14/52