XR400 Four - Skunkworks Special

Discussion in 'Some Assembly Required' started by Pezz_gs, Aug 19, 2009.

  1. trickytrev

    trickytrev Adventurer

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    I see you found pic of my bike tricky trev
    #81
  2. Pezz_gs

    Pezz_gs Cant ride for crap

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    Trickytrev, welcome to the assylum :wave

    Its on over Easter next year so you would have 2 days either side.

    Great if you could bring the CM out for a spin.

    What does it sound like?
    #82
  3. Pezz_gs

    Pezz_gs Cant ride for crap

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    Well I am more than a little chuffed today :wink:

    I just won this on ebay this morning, which gives me all the parts I need to finish the XR460Four build. It is pretty close to home too.

    Its an old XL250 with a XR Disc brake front end. I will be surgically removing the Front end, swingarm as well as many other bits. The seat will be great too.

    The motor needs work but might be good in a Frankenpostie one day :evil

    [​IMG]
    #83
  4. Pezz_gs

    Pezz_gs Cant ride for crap

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    Well I picked it up, 1985 XL250R with XR front end. Realy Happy

    Disc brake front end and pro-link rear end.

    Unsure whether to run the Prolink or twin shock.

    As I am on Holidays for 2 weeks these will be waiting for me when I get home

    [​IMG]
    #84
  5. NordieBoy

    NordieBoy Armature speller

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    What wheel size would you prefer to run.
    Twin shock should be 18" and that pro-link should be 17".
    #85
  6. Pezz_gs

    Pezz_gs Cant ride for crap

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    Well it would be easier to plug and play and run the 17"

    Havent really pondered it. I imagine the 17 was run due to space requirements for the prolink setup.
    #86
  7. Hunsta

    Hunsta Have guns will hunt

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    You know I have an `85 XL350 frame and front end sitting in my shed
    #87
  8. Pezz_gs

    Pezz_gs Cant ride for crap

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    What engine are you going to run . . . . . . something 2 stroke I hope :evil
    #88
  9. NordieBoy

    NordieBoy Armature speller

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    Also the prolink swingarm is easy to lengthen for an 18" wheel and adds a bit of stability especially if the donk going in has a bit of extra power.
    #89
  10. Pezz_gs

    Pezz_gs Cant ride for crap

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    Thanks Nordie

    I appreciate your input.
    #90
  11. Pezz_gs

    Pezz_gs Cant ride for crap

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    Anyone have one of these Acerbis Front disc covers to suit a Honda XR laying around??

    [​IMG]
    #91
  12. carmima

    carmima All Orange :-)

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    Well looks like my run with this adventure is done :cry More specifically the charity ride.

    The missus informed me last night we'll be in Bali over the easter period and that puts an end to proceedings :ddog

    I might still buy the little project I've been looking at though...then I'll be ready if there's another ride.

    Have fun guys
    #92
  13. Pezz_gs

    Pezz_gs Cant ride for crap

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    We'll miss ya . . . . .

    what if we put in a DFAT Travel Warning :ear

    We will be making this an annual event :freaky
    #93
  14. carmima

    carmima All Orange :-)

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    yeah the DFAT thing would be cool - she won't argue against that :lol3

    Glad to hear it's going to be annual - so I'll go ahead with getting a little project going :thumb
    #94
  15. Pezz_gs

    Pezz_gs Cant ride for crap

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    Im on holidats for two weeks up in Forster, enjoying the wife and kids enjoying the beach. Only problem is being so far away from the Skunkworks I wake in the night thinking about this bike.

    I have been mulling over the front end rebuild and have a few questions abou the steering head bearings:

    I need to know the dimensions of the steering head bearing sizes on the XR250 and the sizes of the CB400 Four replacments.

    I tried to find a listing on steering head bearings but no luck.

    I know I can pull them out but the bikes are 3 1/2 hours south of here:ear
    #95
  16. desert dog

    desert dog scrub basher

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    howdy Pezz,

    xlx250r which is the same as xl250r has the same 'replacement bearing as the xr250r '85.' part number 91015425832
    http://www.cmsnl.com/honda-xr250r-85-us_model7751/partslist/F++06.html

    now the headstem bearings in the shed of the xlx250r are E32005J, pickup the new pair tomorrow.
    the dimensions are here,

    http://www.tec.nsk.com/brgic.asp?FromBrgic=1

    or 25mm inside diameter, 47mm outside diameter & 15mm height.

    I hope this helps you sleep at night and do enjoy the holiday.


    cheers matty
    #96
  17. Pezz_gs

    Pezz_gs Cant ride for crap

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    Great Matty

    Just found the sizes for the CB400Four is 26 x 48.5 x 15

    So now I have to find a bearing that has 25mm ID 48.5 OD and 15mm height or there abouts

    I will keep searching
    #97
  18. MODNROD

    MODNROD Decisions, decisions

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    Gday Pezz.
    I work in ag stuff, so thought I'd check out aftermarket bearings for your hotrod (like Fafnir, Timken, etc).
    Bottom line, bugger! I can get part no. 30205, which is 25mmIDx52mmODx16.25mm tall, but that means reaming out the headstock to suit, or you could use the XL250 brng set, but that means shimming up the headstock with 0.75mm thick tube, so haven't been able to help, sorry man.
    At least you know what your up against now I spose!
    Did something similar years ago, and reaming out the headstock, then fitting a machined-up inner pipe to restore strength was how I went, but I'm sure you know what you doing man.
    Enjoy!
    #98
  19. Pezz_gs

    Pezz_gs Cant ride for crap

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    Thanks for the research.

    I will have to pull the front ends off both bikes and see what I have to play with once a rule has been used.

    I may have to machine up bearing carriers for both bearings and weld them in place in the steering head.
    #99
  20. Pezz_gs

    Pezz_gs Cant ride for crap

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    Been in the back yard, as I just got back from Holidays, and giving the XL and the 400 a bit of a look over and a measure up.
    Front will be pretty straight forward. I will need to build a new stem and bearing carriers.

    On the back it will be a big effort to get the Pro-link rear end on it with out butchering the frame. Maybe just butcher it. I will pull the remnants of the engine out and get to see the frame clearly and work out the bracketry.

    So a mini poll if you will indulge me.:deal

    Should I paint the 400's frame and what colour???

    Black - Its a scrapheap bike, dont bother

    White - Factory Dakar bike colour, not sure which factory

    Red - Scientifically proven that it will go faster

    Blue - Cause it will look okay and annoy the Yammie guy's

    Rainbow - Cause I love trees and whales