250r or x?

[woods]

If you had a 250 r frame and 250 x bare frame next to each other what are the physical differences?

I am building up what I was told was a 87 250r with a 350x motor in it.
The whole quad has been taken apart and put back together a few times before I got it so not sure what should be correct.

I picked up a pair of 250r a-arms for it but the bushings are around 1/8 inch wider. everything lines up though.
I bought brake pads for a 250r but they don't fit. the fronts are square pads.

The swingarm should be forked at the pivot but it is solid all the way across.

The paperwork on the quad doesn't say anything other than vin numbers. nothing specific.

I can't find any stamped numbers on the frame either

Any help would be greatful.
Thanks, Ken

[remlapr]

Originally posted by 300exOH
The 250x frame should have square tubing and the 250R will have round.


I think that's bad info, I'm 99% sure all factory 250r frames had square tubing.

[300exOH]

Oops... my bad. Ignore me. LOL I mixed up the R frame and the 400ex frame. Thanks for correcting me remlapr.

Does the R frame still have a removable subframe?

[bradley300]

250x and 250r's both have square frames.

look at the frame rails that the front shock mounts are welded too, are they parallel all the way to the bumper? if so, you have a 250x/300ex frame. on a 250/400ex, those same frame tubes "V" outwards starting at the top bumper mounts.

i think you got a 250x chassis, b/c "R" brake pads are twin pistion and the "R" a-arm bushings are wider than the "X"

[woods]

Thanks for all of the help.
I think the project just got a little larger!!
I have a pair of 250r 2+ arms I will narrow to fit.
I will be welding in a new front shock mount!
I have a 250r swingarm, shock and linkage.
I will look into welding the pivot on the frame!!

How does the X frame compare to the R frame in strength and handling?
Well the rate that I'm going, I won't be a junior member for long!!

Ken

[300exOH]

You can use the 250x/300ex bushings on the 250r a arms to fit the 250x frame if that's what you have. I have the 250r a arms on my 300 and they work pretty good. I would still rather have the correct +2 a arms.

I do know the 250r frame handles better and is stronger.

Good luck with the project.

[atvmxr]

I have an 86 and 88 250r and a 86 frame with a 85 350x motor. I think I might be able to help a little. Also, i think you have an 88 frame instead of an 87. anyway you said:

"I picked up a pair of 250r a-arms for it but the bushings are around 1/8 inch wider. everything lines up though."

The bushings on the 86/87 a-arms are a little wider than the 88 or 89 a-arms. You can spread out the mounting tabs using some bolts if you get creative. or atleast thats what i did to put 86 arms on my 88.

"The swingarm should be forked at the pivot but it is solid all the way across."

The 88 and 89 swingarms are solid across and the 86/87 are forked. The earlier models were forked to accomodate a rear motor mount for the R motor. The 350x motor doesnt have a motor mount there and thus the 88/89 style can be used. The 88/89 style is more diserable because it is aluminum and it is an inch shorter.
Hope this helps.
Ken

[woods]

Thanks for all the help.
With all the info I have found since yesterday, I came to the conclusion that I do have a 250X.
The easiest way for me to tell the difference was what Bradley told me about checking the down tubes the down tubes infront of the steering stem. The x has them straight down and the r has them in a slight V with them being wider at top.

I might start looking for a decent R frame and build off that in the future.

Thanks, Ken

[bradley300]

glad i could help:) even if its bad new:(

[AndrewRRR]

Originally posted by woods


How does the X frame compare to the R frame in strength and handling?
Well the rate that I'm going, I won't be a junior member for long!!

Ken

Back in the early 90's there was an article on a guy that put a 250r motor in the 250x chassis (dont ask me why). I think they had some problems with breaking motor mounts, but that sounds more like fabricator error than chassis design problems. If the X is the same frame as a 300ex it's narrower than an R but that doesn't matter if you are putting on different a-arms, etc.
Good luck.

[bradley300]

actually, the frame is the same size at the a-arms, and the 250x is a stronger frame