426 gearing issues

my buddy has a 01 426 and is geared 14 51 and really runs out of steam quickly on the top end compared to my wr 450 what is the stock gearing and what is the best gearing for trail riding he is jetted and piped

14/50 is stock on the 02 wr426. I run a 13/50 combo for tight stuff and 15/50 for desert and street. Keep in mine 1 tooth in the front is around 3/3.5 in the rear.

I run 14/46 for desert and single track. Tops out at about 95 or so and I can still chug up hills in first.

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