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03 RM125 <-> 05 RM250 springs interchangeable?

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Any idea if either the from or rear springs from the above models are interchangeable?

I'm 210ish and buying a 125 off a dude who weighs around 150, and he's buying a 250 spring for somebody my weight so I'd hope we could swap out to save us both some cash.

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From the fiche:

2005 RM250

SPRING (SOFT,K=5.3) 62211-37FF0 (stock)

SPRING (SOFT,K=4.8) 62211-37FA0

SPRING (SOFT,K=5.1) 62211-37FE0

SPRING (HARD,K=5.5) 62211-37FG0

SPRING (HARD,K=5.6) 62211-37FD0

2003 RM125

SPRING (K=4.9) 62211-36F30 (stock)

SPRING (SOFT,K=4.6) 62211-36EB0

SPRING (HARD,K=5.0) 62211-36F00

SPRING (HARD,K=5.2) 62211-36E80

SPRING (SOFT,K=4.8) 62211-36F10

If I read the numbers correctly, they're the same springs with different applications. What you could do is measure the lengths of the two springs - that will tell you for sure.

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Thanks - my main concern is fork diameter. I think the 125 is 46mm and the 250 is 48. I'd assume different spring sizes accordingly, maybe not.

But yeah, we'll probably just have to pull them off and compare notes.

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Because I've got a YZ250 already and want a play/loaner/clutch practice bike.

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What's 2mm between friends? :lol: Look at the part numbers on the fiche. I suspect the fork spring diameter isn't going to be a problem, but the length may require a spacer to take up any slack.

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What's 2mm between friends? :lol: Look at the part numbers on the fiche. I suspect the fork spring diameter isn't going to be a problem, but the length may require a spacer to take up any slack.

I did and am not sure how to read them - I assumed since totally different numbers they were totally different springs. Does the fact that they all share the 62211 prefix or the second sequence starting one digit apart mean anything? (Sorry...newb of seven months here and still figgering it out).

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It's been a while and I hope someone corrects me if I'm wrong. If I recall correctly, the first set of numbers is the actual part number. The numbers/letters after the dash indicate the model the part is used on and the revisions to the part.

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Huh. One other twist is I still have the stock (lighter) springs off my YZ250 so we'll probably end up just having to break all the bikes down and doing to the trial-and-error thing to see if anything's compatible. Thanks for the help.

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