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Thread: NF4 steering head bearings(RS125 88-94)

  1. #1
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    NF4 steering head bearings(RS125 88-94)

    I was wondering wither anyone has come up with a solution to (Apparently) the factory parts being unavailable without
    making a longer steering head stem and using tapered roller bearings?
    Compare Pornography now to 50 years ago.
    Then extrapolate 50 years into the future.
    . . . That shit's Nasty.

  2. #2
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    Quote Originally Posted by diesel pig View Post
    I was wondering wither anyone has come up with a solution to (Apparently) the factory parts being unavailable without
    making a longer steering head stem and using tapered roller bearings?
    Dave modified if i recall correctly a std ball to suit.
    Yes they are unavailable and are a size unknown to man.
    edit other have modded a std ball.
    The link i posted on the other thread no longer works.



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    Quote Originally Posted by husaberg View Post
    Dave modified if i recall corectly a std ball to suit.
    Yes they are unavailable and are a size unknown to man.
    F*****G Honda they have a lot to answer for.
    Compare Pornography now to 50 years ago.
    Then extrapolate 50 years into the future.
    . . . That shit's Nasty.

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    Quote Originally Posted by diesel pig View Post
    F*****G Honda they have a lot to answer for.
    Yeah they are funny bastards, i bet his brother had a bearing factory.
    There seems to have been no logical reason for creating a special bearing size in the first place either.
    I am trying to look for Daves post.

    here is Cotswold
    http://www.kiwibiker.co.nz/forums/sh...post1130713339

    Quote Originally Posted by F5 Dave View Post
    erm, yeah. . .I sourced some through TSS here in wgtn but didn't write down the numbers, or what supplier they came through. It was someone who knew RS parts, dunno if it was Race supplies, but Kevin(?) should know. Wasn't Whites or Darbi. Might have been eurobike, nah can't have been. Think they were similar to CBR400 maybe(don't quote me, could be C50 step through with my memory), but ohh yeah I remember; the difference was the bottom race was like 6mm thick and I got it surfaced down to 1/2 that.

    Go take some measurements & go see a decent shop.
    Quote Originally Posted by F5 Dave View Post
    Ohh eck, think its (distributor) something like 'K2'
    Quote Originally Posted by koba View Post
    R2 I Think.

    Or D2?



    I'll be getting some soon, will post how I get on.
    Quote Originally Posted by F5 Dave View Post
    Ahh, R2 sounds better. OK 80% likely it was them.
    Quote Originally Posted by kel View Post
    The bearing was made specifically for the RS125 and they are no longer available. You will have to either modify the closest bearing set you can find or change to tapers which means a new/longer stearing stem.
    Quote Originally Posted by F5 Dave View Post
    I've done both the 50 & 100 now, worked fine with whatever roadbike bits but just with one race faced down (its crazy tall for some reason).
    Quote Originally Posted by kel View Post
    CBR900. CBR bearings have the same ID and OD but are thicker, but will pay to check as I could be wrong.
    Click image for larger version. 

Name:	Honda RS125 steering head Bearing.JPG 
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ID:	325218



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  5. #5
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    if the old man can sort out bearing for his 1915 indian wheels , this should be a walk in the park
    i'm over buckets

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    Quote Originally Posted by mr bucketracer View Post
    if the old man can sort out bearing for his 1915 indian wheels , this should be a walk in the park
    If ever there was an opening for an entrepreneur to make some here it is.



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    Yeah piece of piss. I might even have it written down somewhere. Aftermarket, hmm who was distributor? Either way call Andrew at TSS here in the hutt and tell him he'd got us some. He'll remember who to get them from. Might be cbr400. Give him measurements if yer keen.

    I might have it written down at work.

    Only diff is one of the races is like 7mm and you need to get someone to surface 4mm off, (guess) to match the original of the bottom race.

    [Edit]. Oh hold on its in post above.
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    Quote Originally Posted by diesel pig View Post
    F*****G Honda they have a lot to answer for.
    They prolly didn't expect you to turn their bikes into bucket racers and race them for another 30 years...

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    Quote Originally Posted by mr bucketracer View Post
    if the old man can sort out bearing for his 1915 indian wheels , this should be a walk in the park
    Quote Originally Posted by jasonu View Post
    They prolly didn't expect you to turn their bikes into bucket racers and race them for another 30 years...
    Indian may never have thought of bucket racing - but the owners manual quotes every bearing size and every plain bush is replaceable.
    They PLANNED on their stuff lasting for longer than 30 years...

    FWIW, it's possible to reduce bearing race height - both taper races and ball - in the lathe using a carbide tip.
    They're not that hard.

  10. #10
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    the bearings I endedup with and are sat right in front of me untried are NTN
    the numbers on the box's are
    SF0649PX1 (160909)
    SF0581PX1 (160704)

    Not tried them so no yelling at me if they are incorrect

  11. #11
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    Thanks for all the replies. It nice to know I will not be wasting my time trying to get a set of cups and cones for NF4 frames I have.

    Quote Originally Posted by cotswold View Post
    the bearings I endedup with and are sat right in front of me untried are NTN
    the numbers on the box's are
    SF0649PX1 (160909)
    SF0581PX1 (160704)

    Not tried them so no yelling at me if they are incorrect
    Well please let us on here know if they do work Cotswold. Interestingly the old top cone out the NF4 is stamped
    NTN SF05A29PX1.
    Compare Pornography now to 50 years ago.
    Then extrapolate 50 years into the future.
    . . . That shit's Nasty.

  12. #12
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    Quote Originally Posted by cotswold View Post
    the bearings I endedup with and are sat right in front of me untried are NTN
    the numbers on the box's are
    SF0649PX1 (160909)
    SF0581PX1 (160704)

    Not tried them so no yelling at me if they are incorrect
    According to cross refencing these bearing combinations are from the http://www.allballsracing.com/22-1020.html
    Steering Brg - Seal Kit Honda GL1100 80-83, GL1100A 82-83, GL1100I 80-83, GL1200 Gold Wing 84-87, GL1200L/SEL Gold Wing 85-86, GL1500 88-90, GL1500A 91-00, GL1500C 97-00, GL1500CD 01-03, GL1500CF 99-01, GL1500CT 97-00, GL1500I 91-96, GL1500S 90-91, GL1500SE 90-00, NC700JD 16, NC700X 12-15, NSA700 DN-01 09, NT 700 (Euro) 06-08, NT650 (Euro) 88-05, NT650 GT 88-91, NT700V 10-11, NTV 600 (Euro) 88-91, NTV 650 (Euro) 92-97, PC800 Pacific Coast 89-98, ST1100 91-02, ST1100A 92-02, ST1300 03-16, VF1000F 84, VF1000R 85-86, VF1100C 83-86, VF1100S 83-86, VF500C 84-85, VF500F 84-86, VF700C 84-87, VF700F 84-85, VF700S 84-85, VF750C 82-03, VF750C2 97-02, VF750CD 95-96, VF750F 83-84, VF750S 82-83, VFR 1200 10-14, VFR1200X (EURO) 12, VFR700 Interceptor 86-87, VFR750F 86-97, VFR800 Interceptor 98-15, VFR800XB (EURO) 11-12, VT1100C 85-07, VT1100C2 95-07, VT1100C3 98-02, VT1100T Shadow 98-01, VT500C 85-86, VT600C Shadow 88-07, VT600CD 93-07, VT600CD2 99-00, VT700 86-87, VT750C 98-16, VT750C2 07-16, VT750CA 04-14, VT750DC 01-06, VT750DCA 01-07, VT750RS 10-13, VT800 Shadow 88, VTR1000F 97-05, VTR250 Interceptor 89-90, VTX1300 03-09, VTX1300R 05-09, VTX1800 02-08, XL 1000 VARADERO (Euro) 99-11, CB 1300 (Euro) 03-07, CB1000 94-95, CB1000C 83, CB1000R 09-15, CB1100 13-14, CB1100F Super Sport 83, CB300F 15-16, CB400F 89-90, CB500F 13-16, CB500X 13-16, CB600F (599) 04-06, CB600F Hornet (EURO) 98-12, CB700SC Nighthawk S 84-86, CB750 C 80-82, CB750 Nighthawk 91-03, CB750F Super Sport 79-82, CB750K 79-82, CB750L 79, CB750SC 82-83, CB900C 80-82, CB900F (919) 02-07, CB900F 79-82, CBF1000 (Euro) 06-12, CBF250 (Euro) 04-06, CBF500 (Euro) 04-07, CBF600 (EURO) 04-10, CBR1000F 87-96, CBR1000RR 04-07, CBR1100XX 97-07, CBR250R 11-13, CBR300R 15-16, CBR400 91-98, CBR500R 13-16, CBR600F 87-90, CBR600F2 91-94, CBR600F3 95-98, CBR600F4 99-06, CBR600RA 15-16, CBR600RR 03-16, CBR650F 14-16, CBR900RR 93-99, CBR929RR 00-01, CBR954RR 02-03, CBX1100 79-82, CBX250 TWISTER (EU) 01-04, CBX750 (EURO) 94-01, CMX450 86-87, CRF1000 Africa Twin 16, CTX1300 14, CTX700 14-16, CX500TC Turbo 82, CX650T Turbo 83, GL1000 Gold Wing 77-79, Triumph America 02-13, Bonneville 11-14, Scrambler 06-14, Speed Master 03-13, T100 Bonneville 02-14, Thruxton 900 04-14



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  13. #13
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    Quote Originally Posted by cotswold View Post
    the bearings I endedup with and are sat right in front of me untried are NTN
    the numbers on the box's are
    SF0649PX1 (160909)
    SF0581PX1 (160704)

    Not tried them so no yelling at me if they are incorrect
    Im keen to try them to see if they fit ok Tim .

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    Quote Originally Posted by Rick 52 View Post
    Im keen to try them to see if they fit ok Tim .
    fine by me...

  15. #15
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    A update

    Just posting for completeness and so to help others.

    A working solution to what to use to replace NF4 steering head bearings (RS125 88-94) is to use one of each of 91016-KT8-005 and 91015-KT8-005 bearings from a CBR900 they will need to have 4mm removed from each of the cones any good engineering workshop can do this.

    I hope this is of help to others Cheers.
    Compare Pornography now to 50 years ago.
    Then extrapolate 50 years into the future.
    . . . That shit's Nasty.

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