Any 1 know about sprocket ratios?

[mann81591]

I believe i have stock front and back sprockets on my 400ex seance i haven't needed to replace them. But i just changed my rear tires from stock size to 8in. I don't really want the bottom end that I'm going to receive from the smaller tires though. What sprockets should i change to get that stock mid-range back? What size teeth would you recommend?


Any help would be very much appreciated. Thanks everyone!

[mineralgrey01gt]

id go up on the front sprocket to get it back, i think stock might be 13 tooth but dont hold me to it, i know on my old 250r stock was 13/39 and when i put my 18" holeshots on it i had to bump it up to 14 in the front to get the "stock" gearing back

[mann81591]

okay. thanks

[justen08]

I just bought my 07 400ex it has 14/38.Unless I miss counted :D

[johnnynonails]

depends on the year
early models are 15/38
i think the later models are 14/38 0r 39

[mineralgrey01gt]

i stand corrected lol. Thanks for the info. I need that

[Ryan'07400ex]

mann make sure you count your teeth before you get another if its used. The back sprocket should have the number on it.
what year is yours?

04 down stock is 15/38
05 up is 14/39