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86 RM250 shock into 84 RM500 ?
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Topic: 86 RM250 shock into 84 RM500 ? (Read 1893 times)
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Dono113
Legend
Posts: 535
86 RM250 shock into 84 RM500 ?
«
on:
July 25, 2012, 12:19:13 pm »
Gotta rebuild my old shock and it's in pretty bad shape, found a good condition RM250 86 model shock that looks the part, good clicker etc. would just have to change out res. line as it's a shorter lenght, anyone tried this or done this??
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1983 CR125R
2003 CRF450R
CB750K1
2005 YZ85
1969 TS 250
D project
A-Grade
Posts: 409
Re: 86 RM250 shock into 84 RM500 ?
«
Reply #1 on:
July 27, 2012, 06:29:59 pm »
Don't see why not,as long as they are the same length
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BAHNZY
Legend
Posts: 1149
Re: 86 RM250 shock into 84 RM500 ?
«
Reply #2 on:
July 28, 2012, 08:24:42 pm »
The challenges;
1st is getting the shock in with the correct eye to eye length.
2nd is making sure that you have enough piston travel to match the suspension stroke.
3rd is getting the valving correct
And 4th is getting the correct spring.
Why?
Because the 86 model (if I'm correct) is a rising rate linkage system whereas the 84/85 is is not. I fitted a KTM Ohlins shock into my 84 125 and whilst it was 1/2 reasonable on the small hits, the big hits the suspension was way to harsh and kicked like a mule. Valving and a linear rate spring rather than a rising rate spring got it right, but not after a lot of work.
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Rod (BAHNZY) Bahn
Dono113
Legend
Posts: 535
Re: 86 RM250 shock into 84 RM500 ?
«
Reply #3 on:
July 31, 2012, 10:35:51 am »
Knew there where reason why I hadn't read about it, thanks brother I would spend the right money money fixing my shock than wasting money on pipe dreams so to speak.
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1983 CR125R
2003 CRF450R
CB750K1
2005 YZ85
1969 TS 250
JohnnyO
Legend
Posts: 4658
Qld
Re: 86 RM250 shock into 84 RM500 ?
«
Reply #4 on:
July 31, 2012, 10:53:40 am »
Bahnzy is right, the 2 rear suspension systems are chalk and cheese. They will be different in spring rate, valving and shaft travel. Not worth the headache...
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Dono113
Legend
Posts: 535
Re: 86 RM250 shock into 84 RM500 ?
«
Reply #5 on:
August 01, 2012, 02:26:27 pm »
Would any one have a good spare shock laying around?
??
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1983 CR125R
2003 CRF450R
CB750K1
2005 YZ85
1969 TS 250
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86 RM250 shock into 84 RM500 ?