yzf426 hybrid gearing choice

[lonestar250r]

anybody here running a yzf 426 in their quad? what sprocket setup would you reccomend for motocross. i was thinking around a 13/39

[chopp124]

15/39

[SpasticR450]

I did 13/39 on my yz with 18s and loved it but never did any other combo so wouldn't know what works best. I know back when i still had the 400ex engine in it i went to 13 and basicaly lost 1st gear it being such a small front sprocket. The smaller the sprocket the faster they wear out to. I would do 13/39 or 14/39. 15/39 seems kind of tall to me for mx.

[josborn]

14/37 or 38 in the 5 speed, I ran 15 37/38 in the 4 speed 450.