Sorry for all the questions guys but I need a lot of help to understand these things. I've read conflicting statements of 0-60 times and top speed of this model. With the final gear ratio, the tire size and the rpm(9000) top speed can be calculated. If anyone out there knows the ratio to each of the five speeds and the counter sprocket and sprocket count this would be beneficial as well at determining drag times and mph at each shift point. I have the weight and hp.
Thanks.

 

Here is a list from my owners manual,

rear tire size= 20x10-9

max engine rpm stock= 9100

primary reduction ratio= 2.826

1st gear ratio= 2.971
2nd gear ratio= 1.938
3rd gear ratio= 1.471
4th gear ratio= 1.182
5th gear ratio= 1.000

sprockets f/r 15/38

to get the final drive gear ratio devide 15by 38

I think I came up with 72mph when I checked the 400EX with this formula, and around 74mph if you go to 22" rear tires like on the 300EX.

[This message has been edited by TRX400EXitement (edited 01-05-2000).]

 

Thanks a lot man, good job.

 

What about a sprocket combo of 14/39 with 22" tires?

------------------
a Fast Boy from Illinois -(FBI)- Riding a 2000 Honda 400EX

 

FBI, did you try the different gearing (14/39) for the 22" tires. I've recently bought the XCT's and am looking into re-gearing. Can't seem to get a straight answer from any dealer around here..

 

I have not tried this set-up yet, but there are guys at the Honda forum that have and the word is that this is the best set-up for the 22" tires. Go to the Honda archives and you will be able to find that information.

 

Thanks, I ordered both sprockets and of course one of them is wrong (the front one). I have put the rear 39 on and I am back to wheeling all over the place. It's hard to believe one tooth on a sprocket can make a difference. Once the 14 comes in for the front I'll post my findings.