gearing

[spoiler61]

So, I dropped a tooth on the front to 13..That was w/ the big 3, now I have engine work done. I still come out of the hole hard, gaining in 2nd and 3rd when I hit 4th I loose some HP. My Q, is should I go up a tooth in the rear to gain on the top end and leave the front at 13, or go back to 14 in the front? This is all in sand...

[Sandeater]

If you go up in the rear, its like dropping a tooth in the front.  You might go back to the 14 and see how that does with the 38 in the rear.  I went from 14/38 to 14/40 this year with extremes and seemed to do good....going back to 14/38 this year to see what it will do.

[fireman5166]

im running a 13/38 right now. pulls 3rd up sand mountain. I bought a 12/40 to see if I can get 4th up the hill. right now Im beating a lot of people.( but we always want to go faster. lol.) my buddy runs a 12/38 and pulls a hard 3rd. (almost to hard) maybe Im wrong but when pulling the steep hills you want to go 12/40.  I won't be able to tell you how good it works until next spring when I go back to the mountain.

[SANDMAN]

Everything comes Into play when gearing your bike, So Im not sure anyone will give you the answer you are looking for.
I think the best way to gear any bike Is with a box of sprockets and a radar gun.

[spoiler61]

yeah I think I will just try my 14 on thanksgiving, maybe try a 15 also, seems like a lot of guys run a 15 w/ engine work done...It will just take time.... Thanks for the help....

[Bert]

Front sprocket
13T   -5 mph
14T    stock
15T   +5 mph

Rear
36   +3.2 mph
37   +1.6 mph
38   stock
39   -1.6 mph
40   -3.8 mph

[Bert]

Hour Meter/Tach from Yamaha
http://www.yamaha-motor.com/sport/accessories/acscitemdetail/5/442/1848/13490/all/1/1931/0/detail.aspx


Could you use this tach to gauge your sprocket changes on the hill?