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MIKE400EX
06-23-2006, 08:43 PM
If someone has one apart, could you please measure the length of the threaded sleeve - part that butts against the brake hub (Honda calls it a bolt). I just want to make sure that it is longer than one from a 400EX before I buy one.

Thanks!
DezSled
06-23-2006, 09:14 PM
left '85 ATC250R 1 1/8"

right '86 ATC250R & '86-9 TRX250R 1 3/8"
MIKE400EX
06-24-2006, 04:57 AM
Thanks Dez!
That explains it, you need the longer "bolt" to put a 250R axle on a 400ex.
quad9
06-27-2006, 11:51 AM
yup, i'am doing the samething right now lonestar 250r axle in the 400ex. yes you need a trx250r nut. the 400ex nut will max out on adjustment, and still be 1/8" to short
MIKE400EX
06-27-2006, 12:01 PM
Thanks Quad9!
I was given a "basket case" to make something out of. Hubs on the TRX250R are 25 spline too, the 400's are 24 in case you haven't gotten to that point yet.
quad9
06-27-2006, 01:22 PM
yup i already got my trx250r hubs.
the 400ex rotor hub will fit it is the same spline
the 400ex hub nuts are to small, you will need 250r nuts.

now i just need to find me a swing arm, mine was trashed last week.
Rich250RRacer
06-27-2006, 02:04 PM
Originally posted by quad9
yup, i'am doing the samething right now lonestar 250r axle in the 400ex. yes you need a trx250r nut. the 400ex nut will max out on adjustment, and still be 1/8" to short

I must bestow some of my wisdom, the ATC250R and 400EX use the same threaded collar, which is shorter than a TRX250R, but you can use them if you use part number 15 in this diagram. This is the parts diagram for an '85 ATC250R.
http://images.powersportsnetwork.com/fiche/images/Honda/1985/ATVs/1840_REAR%20WHEEL%20AXLE%2085.gif

In fact, even if you run the stock axle nut on a TRX250R, I recommend using it, since it gives the outer nut a few more threads to grab on.
MIKE400EX
06-27-2006, 02:20 PM
Wisdom is good! The TRX250R longer collar is $34 from the local stealer. That adaptor is probably less. Thanks!
MIKE400EX
06-29-2006, 07:34 PM
Does anyone have a mic handy and would measure the OD of their sleeve/axle bolt? The new one I just paid 34 bucks for is 1.883" and all the old ones I have are 1.872-1.874". Needless to say it doesn't fit. Thanks!