450r rear master cylinder swap [Archive]

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MossboysRacing

01-15-2010, 06:07 PM

So I have been thinking about doing this swap for a while. I have already done the 450r rear caliper swap and i had the entire set-up already on the shelf. My 250r MC was complety worn out. It still worked great, but the actual MC metal was wearing down from 20 years of use without a guard.
http://s496.photobucket.com/albums/rr321/mossboys/?action=view&current=mossboys001-2.jpg

Mr Honda is a pretty smart guy because the only difference between the 250r and 450 MC is the pushrod length. All i had to do was dis-assemble the two MC's and put the 250r pushrod (longer) into the 450r MC. sorry NO pic :(

I used the 250r rear resivor and brake hose as they fit right into the 450r MC. My Steel braided brake line was a direct fit also.

Like i said, i didnt do this for any real performance gain. It was more of keeping the old R running with some new easy to find parts. Hopefully you found this information useful !

http://s496.photobucket.com/albums/rr321/mossboys/?action=view&current=mossboys002-2.jpg&t=1263603999892

rustyATV

01-15-2010, 09:52 PM

Cool. I was thinking about trying this after I found the 400EX rear master cylinder bolted right up. My 250R rear caliper needs to be tossed.

Langbolt

01-15-2010, 10:22 PM

Is it just me or does the shaft and cylinder NOT look straight ???

Hey Rusty, The 400ex M/C won't work as well as the 450.....the supply line connector points in the other direction. Unless you swap it out with the one from your 250r.

:devil:

Langbolt

01-15-2010, 10:25 PM

Here's pic's of all 3

rustyATV

01-16-2010, 09:27 AM

Originally posted by Langbolt
Is it just me or does the shaft and cylinder NOT look straight ???

Hey Rusty, The 400ex M/C won't work as well as the 450.....the supply line connector points in the other direction. Unless you swap it out with the one from your 250r.

:devil:

I just bolted it up to try it. Since I have a 450R front brake system, I wanted to have a 450R rear system to minimize the degree of "Frankensteiness" my quad has.

MossboysRacing

01-16-2010, 06:21 PM

Its not totally straight. But i havent had any problems so far