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Thread: 1982 CB250RS - Rebuild - Valve Springs & Cam Chain

  1. #1
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    1982 CB250RS - Rebuild - Valve Springs & Cam Chain

    Hey all,

    Some of you may know Im doing a rebuild on the top end of my 82 RS. Enjoying it thoroughly even if I do find the manual and my lacking experience a pain in the butt sometimes

    Found all my inner valve springs at 36.4 - 36.6mm free spring length.
    Should be 38.1 if new, with 37mm being the service limit.

    I realise the difference would be minimal, but if there's a set of 4 knocking around somewhere the brings them back into the midrange around 37.5-38.1mm I'd love to have peace of mind knowing Im doing my best for the old thumper?

    Part number(s) 14761429003 for 1980 CB250RS, 14761429005 for 1982 CB250RS

    Tried with Honda Official Parts.
    Been in touch with Anaconda Honda already, no luck for anything over 37mm.
    Also no luck on Ebay.
    Tried WeMoto.

    Anyone recommend a place sourcing this sort of thing, I get the feeling someones got a bag of em sitting in the back of their garage Haha

    Cheers, J
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  2. #2
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    Did you try PlenterNZ? Or Wemoto.com?
    Only a Rat can win a Rat Race!

  3. #3
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    Quote Originally Posted by Laava View Post
    Did you try PlenterNZ? Or Wemoto.com?
    No luck on Wemoto. Will give PlenterNZ a call/email. Cheers for the suggestion!


    Admittedly, 'JAP MC DISMANTLERS' down south has found me a set. Only trouble being, they've said they're all over 39mm??

    My service book implies that the free spring length should be 38.1mm new/max, right? (see attached image)


    Does anyone know where I could find the free spring length of a NEW OEM inner valve spring? CMSNL has no measurements.


    Thanks all,
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  4. #4
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    I am confused Honda still lists the springs as being available they are not that expensive?
    https://genuineparts.hondamotorbikes...1429005/spring

    https://genuineparts.hondamotorbikes...1429005/spring
    So its about $76 you should replace the seals at the same time part they will be part of an aftermarket gasket set anyway
    if you need a piston and rod get these from TKRJ


    if you are skint you could shim them up or you could stretch them out with a few blows between the coils but i would not recommend doing either unless you were totally skint.
    Both would likely do more damage than having slightly short springs anyway.



    Kinky is using a feather. Perverted is using the whole chicken

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    Anaconda? What about Econohonda...Malcolm. In Te Aroha.

  6. #6
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    Quote Originally Posted by husaberg View Post
    I am confused Honda still lists the springs as being available they are not that expensive?
    https://genuineparts.hondamotorbikes...1429005/spring

    https://genuineparts.hondamotorbikes...1429005/spring
    So its about $76 you should replace the seals at the same time part they will be part of an aftermarket gasket set anyway
    if you need a piston and rod get these from TKRJ


    if you are skint you could shim them up or you could stretch them out with a few blows between the coils but i would not recommend doing either unless you were totally skint.
    Both would likely do more damage than having slightly short springs anyway.
    Hi Husaberg, I did in fact get touch with Honda initially, they said the part was unavailable

    Appreciate the tin shed technique of shimming/stretching Haha but think I'll endeavour to find new old stock or oem spares from a parts spot
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  7. #7
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    Quote Originally Posted by Trade_nancy View Post
    Anaconda? What about Econohonda...Malcolm. In Te Aroha.
    Same place, Anaconda is the new name apparently... https://www.anacondaltd.co.nz/parts

  8. #8
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    Quote Originally Posted by jmpl View Post
    No luck on Wemoto. Will give PlenterNZ a call/email. Cheers for the suggestion!


    Admittedly, 'JAP MC DISMANTLERS' down south has found me a set. Only trouble being, they've said they're all over 39mm??

    My service book implies that the free spring length should be 38.1mm new/max, right? (see attached image)


    Does anyone know where I could find the free spring length of a NEW OEM inner valve spring? CMSNL has no measurements.


    Thanks all,
    How much longer are the replacements? Longer will not be an issue UNLESS they become coil bound at full lift? If the head is still assembled rotate the cam until the valve is at maximum opening then see how much more it can be opened before the coils bind - thats how much you have to play with.
    it's not a bad thing till you throw a KLR into the mix.
    those cheap ass bitches can do anything with ductape.
    (PostalDave on ADVrider)

  9. #9
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    Quote Originally Posted by pete376403 View Post
    How much longer are the replacements? Longer will not be an issue UNLESS they become coil bound at full lift? If the head is still assembled rotate the cam until the valve is at maximum opening then see how much more it can be opened before the coils bind - thats how much you have to play with.
    Gidday Pete, have asked the nice man, now waiting on email reply re measurements.

    Head is disassembled and tbh not sure I follow how I would do this test of yours. How am I supposed to see if the coils are binding if the head is assembled? Are you able to explain a little more visually please?

    To confirm, by coil bound you mean when the spring becomes fully compressed and it's rings touch? And by full lift you mean when the valves are fully open?

    Cheers

  10. #10
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    Quote Originally Posted by jmpl View Post
    Gidday Pete, have asked the nice man, now waiting on email reply re measurements.

    Head is disassembled and tbh not sure I follow how I would do this test of yours. How am I supposed to see if the coils are binding if the head is assembled? Are you able to explain a little more visually please?

    To confirm, by coil bound you mean when the spring becomes fully compressed and it's rings touch? And by full lift you mean when the valves are fully open?

    Cheers
    I'm assuming its possible to see whats inside the cam cover, ie the cam, cover is removed and you can get at everything - I dont know if that is the case with your engine. So the with head assembled, valves springs, cam etc in place, the cam is rotated till the nose of the cam has the valve fully open, then you see if you can push the valve any more open, measuring what clearance there is between the cam and the tip of the valve stem. Coil bound is where the spring is fully compressed. Valve guide seals take up a bit of space too, not unknown for seals to be removed to accomodate a high lift cam
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    it's not a bad thing till you throw a KLR into the mix.
    those cheap ass bitches can do anything with ductape.
    (PostalDave on ADVrider)

  11. #11
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    Quote Originally Posted by pete376403 View Post
    I'm assuming its possible to see whats inside the cam cover,
    It isn't. Cover has cam bearings incorporated.
    With stock cam, they're a mile away from coil-bound. I wouldn't worry if the free length is up to 40mm or so.

  12. #12
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    Thanks @pete376403 for clarifying, sadly as @Grumph says this isnt the case with the top end of the CB250RS.

    See pictures attached for reference

    Thanks @Grumph for the heads up re 40mm clearance. That's the length of the springs Ive been offered so am going to give them a go!
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  13. #13
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    Quote Originally Posted by jmpl View Post
    Hi Husaberg, I did in fact get touch with Honda initially, they said the part was unavailable

    Appreciate the tin shed technique of shimming/stretching Haha but think I'll endeavour to find new old stock or oem spares from a parts spot
    you are correct sorry i never pressed order to confirm. As normally if they are not available they have no price also i never properly read your original post.

    Looking in the Fiche there are two distinct part numbers for the springs i would say Honda issues lengths or rate as a change.
    Make sure the service manual you are using as a reference covers both or all years 1980 and 1982 i would say Honda changed the length maybe in combo with the cams/rockers but your service manual might not cover both. Honda normal indicate the springs with a colour dab. The springs number hanges are not a subrceeded number so it not a change later and therefore i would suggest there is diferent specs.
    They all should all play with each other as the parts fiche doesnt list up to cerain engine number etc for the parts listing.
    Interestingly the same pairs were used on a lot of models

    CB250RS 1980 and 1982
    XL250R 1982
    XL250R 1983
    XL250S 1980
    XL250S 1981
    XR250 1980
    XR250R 1981
    XR250R 1982
    XR250R 1983
    XR500 1979
    XR500 1980
    XR500R 1981
    XR500R 1982
    XL500R 1982
    XL500S 1979
    XL500S 1979
    XL500S 1980
    XL500S 1981
    FT500 1982
    FT500 ASCOT 1983

    but in aftermarket catalogs they list different springs
    Web cam list new springs
    http://webcamshafts.com/pdf/catalog.pdf

    there are NOS listed on Ebay and other sites under the parts numbers.

    personally, i would just have a look through the XR250R and XL250S for the same years and see what they list.

    There wll be service manuals for the correct matched XL XR on the net.

    Shiming isnt really that bodgy this was done by many tuners from new less damaging than HD springs.
    Stretching them is but is pretty common thing to do on saggy clutch springs you use a chisel



    Kinky is using a feather. Perverted is using the whole chicken

  14. #14
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    Quote Originally Posted by husaberg View Post
    you are correct sorry i never pressed order to confirm. As normally if they are not available they have no price also i never properly read your original post.

    Looking in the Fiche there are two distinct part numbers for the springs i would say Honda issues lengths or rate as a change.
    Make sure the service manual you are using as a reference covers both or all years 1980 and 1982 i would say Honda changed the length maybe in combo with the cams/rockers but your service manual might not cover both. Honda normal indicate the springs with a colour dab. The springs number hanges are not a subrceeded number so it not a change later and therefore i would suggest there is diferent specs.
    They all should all play with each other as the parts fiche doesnt list up to cerain engine number etc for the parts listing.
    Interestingly the same pairs were used on a lot of models

    CB250RS 1980 and 1982
    XL250R 1982
    XL250R 1983
    XL250S 1980
    XL250S 1981
    XR250 1980
    XR250R 1981
    XR250R 1982
    XR250R 1983
    XR500 1979
    XR500 1980
    XR500R 1981
    XR500R 1982
    XL500R 1982
    XL500S 1979
    XL500S 1979
    XL500S 1980
    XL500S 1981
    FT500 1982
    FT500 ASCOT 1983

    but in aftermarket catalogs they list different springs
    Web cam list new springs
    http://webcamshafts.com/pdf/catalog.pdf

    there are NOS listed on Ebay and other sites under the parts numbers.

    personally, i would just have a look through the XR250R and XL250S for the same years and see what they list.

    There wll be service manuals for the correct matched XL XR on the net.

    Shiming isnt really that bodgy this was done by many tuners from new less damaging than HD springs.
    Stretching them is but is pretty common thing to do on saggy clutch springs you use a chisel
    Heya Husaberg,

    No worries! Certainly appreciate your research re part hunting, dang, hats off

    Are you able to share a link to the Fiche page you were looking at for the 82 CB250RS?

    Yep, my CB250RS service manual covers 1980 - 1984 so all good there. Have compared this with the XL/XR service manual I have that covers 1978 - 1984.

    *Note the different length in springs there between the 250cc and 500cc models....

    Will be paying attention to the factory paint colour on the top of the replacement springs when they arrive

    I'll keep this thread posted with how it all goes!
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  15. #15
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    Quote Originally Posted by jmpl View Post
    Heya Husaberg,

    No worries! Certainly appreciate your research re part hunting, dang, hats off

    Are you able to share a link to the Fiche page you were looking at for the 82 CB250RS?

    Yep, my CB250RS service manual covers 1980 - 1984 so all good there. Have compared this with the XL/XR service manual I have that covers 1978 - 1984.

    *Note the different length in springs there between the 250cc and 500cc models....

    Will be paying attention to the factory paint colour on the top of the replacement springs when they arrive

    I'll keep this thread posted with how it all goes!
    that Hayes manual looks wrong re the 250 i know this as the valves and set up etc are completely different for the 84 so i would suggest they listed only the later. Or does it break them down per year?
    Same with the 80-83 XR500 the 83 on is different. but only list one set of figures. Or is there more?

    For the parts Fiche

    it would have been CMS
    i would have picked AUS at a guess
    but it matters not as all models had the same springs.
    i never crossed checked the 500 or the XR250R to see if they had succeeded new part numbers but its a longshot. (i just checked but they all list the dame parts sorry)
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    Partxzilia a and honda of the troy list the same numbers
    David Silver in the UK has a huge nventory of NOS parts and makes up parts to original spec.

    oh here you go R&D list them
    https://www.rdvalvespring.com/spring-kits
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    only listed for one model.

    edit
    here is gen XR500R 81-82
    honda service figures
    https://davesbikes.weebly.com/upload...046/xr500b.pdf
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    Kinky is using a feather. Perverted is using the whole chicken

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