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GEARING & FLYWHEEL COMBINATIONS FOR OFF ROAD TRAIL USE

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I WOULD LIKE TO GET RECOMMENDATIONS TO MAKE MY 2002 YZ250F MORE DIRT WORTHY FOR OFF ROAD/TRAIL USE (VERY SELDOM USE IN THE TRACK)

WHAT WOULD BE A GOOD SPROCKET COMBO FOR OFF ROAD TRAIL RIDING?

WOULD I GET BETTER RESULTS WITH AN 18" REAR WHEEL?

WHAT WEIGHT FLYWHEEL WOULD WORK BEST?

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12oz. FWW would be good. Adding a couple of teeth to the rear sprocket will lower your gearing. Leave the gearing alone and get a Reckluse ZStart auto clutch.

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I WOULD LIKE TO GET RECOMMENDATIONS TO MAKE MY 2002 YZ250F MORE DIRT WORTHY FOR OFF ROAD/TRAIL USE (VERY SELDOM USE IN THE TRACK)

WHAT WOULD BE A GOOD SPROCKET COMBO FOR OFF ROAD TRAIL RIDING?

WOULD I GET BETTER RESULTS WITH AN 18" REAR WHEEL?

note:

the caps lock key is on the left side of the keyboard, see

http://losdos.dyndns.org:8080/public/misc/capslock.gif

onward, first sprockets...

folks here seem to like 13/50 gearing for trail riding. this setup provides good 2nd and 3rd gear trail speeds. but it depends if you are riding tight stuff or more open trails, so you may have to experiment a bit until you find a ratio that suits your terrain and riding style/ability.

then wheel sizing...

the WRF's 18" rear wheel + tire assembly has approximately the same outside diameter as the YZF's 19" rear wheel + tire assembly. the sidewall of the 18" tire is taller (that is, it has a higher aspect ratio), which makes up for the smaller diameter.

for more info see

http://www.thumpertalk.com/forum/showthread.php?t=116583

and also especialy this post

http://www.thumpertalk.com/forum/showthread.php?t=155795

advantage of a 18" wheel: better pinch flat and rim protection in rocky or other hard terrain (that's why it's used on off-road bikes like the WRF)

advantage of a 19" wheel: lighter (that's why it's used on MX race bikes like the YZF)

jim aka the wrooster

'01 wr250f

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12oz. FWW would be good. Adding a couple of teeth to the rear sprocket will lower your gearing. Leave the gearing alone and get a Reckluse ZStart auto clutch.

What will the Zstart clutch do exactly? :cry:

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