Will a 400EX axle fit 250R???

[engineer81]

Hello. I am new to the forum and just started restoring an 1987 250R. After tearing down the rear end, I discovered that one of the bearing surfaces of the rear axle is smoked. I would like a reasonably priced fix and wondered what my options are for replacement axles. Will a 400Ex or 450R axle work? Any help appreciated. Thanks

[KASEY]

I am running a 400ex axle in a 250r without any issues!

[red88r]

It will work.  My last 86 had a 400ex axle/hubs on it.  I believe they are a little narrower with this setup.

[bnau267]

Yes...need to run 400ex hubs.  They are almost identical width.  You can't run the 250r antifade unless you have 3/16 machined from the nut (at least for a RPM setup).

http://trx250r.org/threads/3000-Laeger-XC-quot-ONE-of-ONE-quot/page4

[250r fanatic]

I have a nice set of chrome 400ex hubs for sale. what I ran on my R

[engineer81]

So what you guys are saying is that I can use a 400EX axle but also have to use the EX anti-fade nut assembly or have the 250R one machined? Also when you talk about hubs do you mean the hubs the wheels mount to or the hubs that the sprocket and rotor mount too? Like I said I am new to the 250R world so I'm a little confused with the lingo. Thanks

[bnau267]

So what you guys are saying is that I can use a 400EX axle but also have to use the EX anti-fade nut assembly or have the 250R one machined? Also when you talk about hubs do you mean the hubs the wheels mount to or the hubs that the sprocket and rotor mount too? Like I said I am new to the 250R world so I'm a little confused with the lingo. Thanks

That's a big NO on the EX anti fade but yes on the EX wheel hubs.  Dan may be right on the LSR stuff but I can only confirm for the RPM parts.  RPM does not make a 400ex antifade and the 250r will not clear without machining.  I'm 100% sure on the RPM.  I spent a ton of time on the phone with them trying to have them do a run of 250r XC axles.  In the end we came up with a solution to machine 3/16 from the disc side of the nut to allow enough clearance for the snap ring.  BTW - the stock Honda 250r brake hub/nut setup worked fine with the EX Axle.

[bnau267]

RPM carriers are not OEM fitment, and I believe they come with their own brake stay. Just FYI. I had the same problem you mention on spacing when I had the tapered bearing carrier.

You might be thinking about RAD mfg with the special brake stay.  The RPM double row is a direct OEM replacement.  I'm running a T&T though...

[bnau267]

You might be right on that, I'll stop confusing the OP.  I'd call Heath at LSR, super knowledgeable and will answer your questions.

Yeah.  Best bet for the OP.  We need to join a debate club...lmao.

[C-Leigh Racing]

Pay close attention to the alinement of the chain.
What I found with a G Force brand 400EX axle, the sprocket hubs not machined the same (not as long) as a 250R lonestar axle & a 3/16" spacer washer will be needed between the sprocket hub & the carrier bearing, so that the chain will be in line with the front sprocket.
That sprocket hub by it being shorter, will bottom out on the seal in the carrier as well, so that spacer washer must be used to make the 400EX axle work. G Force that is.
Neil

[engineer81]

Well thanks for all the info/discussion about this topic. I was more or less going with a stock type set-up to keep the cost down(I'm not a racer either). I was planning on buying an aftermarket billet carrier already assembled so I don't have to mess with the bearings. Aftermarket axles are very pricey so probably off to ebay for a good used axle/hubs. If anyone knows where I can get a fair deal on an axle please let me know. I would prefer a 250R axle over the 400EX one (to eliminate any issues and reuse my hubs) but would take either if the deal is right. Thanks

[bnau267]

Pay close attention to the alinement of the chain.
What I found with a G Force brand 400EX axle, the sprocket hubs not machined the same (not as long) as a 250R lonestar axle & a 3/16" spacer washer will be needed between the sprocket hub & the carrier bearing, so that the chain will be in line with the front sprocket.
That sprocket hub by it being shorter, will bottom out on the seal in the carrier as well, so that spacer washer must be used to make the 400EX axle work. G Force that is.
Neil

Just measured my setup vs the OEM R an you are correct on the chain alignment.  Guess I'm calling RPM tomorrow to have then machine 3/16" from the carrier side of sprocket hub where the chainring bolts up.  This should fix the alignment. Glad [MENTION=1050]engineer81[/MENTION] started this thread.

[C-Leigh Racing]

Just measured my setup vs the OEM R an you are correct on the chain alignment.  Guess I'm calling RPM tomorrow to have then machine 3/16" from the carrier side of sprocket hub where the chainring bolts up.  This should fix the alignment. Glad [MENTION=1050]engineer81[/MENTION] started this thread.

No, all you need is that 3/16" machinery washer to put between the sprocket hub & bearing to space the axle out. Whole lot cheaper than having that carrier machined. Now you could just pop the seal out of the carrier, if the bearings is a sealed bearing & the hub might clear, but you'll still have the chain alinement deal.
That is on a G Force axle though. The sprocket hub, how it is machined where the seal touches, it is flat & then has a curve like to it when it gets to the part where the sprocket bolts on & in that curve is where it will touch the carrier.
Neil

[F-Red]

The 3/16 washer would be placed here? Would that effect where the bearing race and dust seal, would sit on the axle? I need to replace my LSR axle. Them new are taxing! The Tusk brand could provide.

[trx250scar]

I have been running a tusk axle on my trx450 for around a year. no problems. have heard the sprocket hub is weak but have not had any signs of it getting loose.