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Project 72 Honda SL125

Discussion in 'Other Projects - Other Bikes (non 250's)' started by Andych, Jun 28, 2020.

  1. Andych

    Andych Moderator Staff Member Premium Member Contributing Member

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    1987 Yamaha SRX250, Honda 1975 CB400F, Honda 1974 SL125 K1, Honda CB400SF (NC42)
    I had a couple of important parts arrive today from the USA...
    Injection moulded Side covers that are very well made... much better than the alternative fibreglass ones from Thailand...
    And pretty close in price when it all comes down to it.
    IMG_5808.jpeg IMG_5809.jpeg
     
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  2. risky

    risky risky

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    yep, saw that post on facebook
     
  3. Andych

    Andych Moderator Staff Member Premium Member Contributing Member

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    I used my environmentally friendly Solar powered Low Bake oven today to paint the Engine for the SL125.... 42 C in the shade... goodness only knows what the surface temp in the Sun would be...

    IMG_5811.jpeg
     
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  4. Andych

    Andych Moderator Staff Member Premium Member Contributing Member

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    My Bike:
    1987 Yamaha SRX250, Honda 1975 CB400F, Honda 1974 SL125 K1, Honda CB400SF (NC42)
    The weather is warming (slightly) here on the NSW / Vic border so I have been playing with the SL125 again... I wasnt happy with the way the rim laced up so I started looking into it.
    They just didnt sit right at the hub and when I tried to do a final true and centralise the rim... I couldnt get it even close to centre so I pulled it all down again to compare against standard (of the other rim I have) spokes..
    The Vintage Avenue ones are a long way off standard which was causing a heap of issues..

    This is one of the front spokes compared to the stock item
    IMG_6029.jpeg

    This is the other front spoke compared to the stock one.
    IMG_6030.jpeg


    The rears were not quite as bad but still not right.
    IMG_6027.jpeg

    IMG_6028.jpeg

    This is how the front spokes sat when laced up (at the hub)
    IMG_6024.jpeg

    The to add insult to injury... when I took the rear hub apart this is what I found once the rear sprocket was removed.
    IMG_6026.jpeg

    There is no chance of those cush drive rubbers coming out and the hub staying in one piece so I am now on the hunt for a replacement hub... am I game to use a Pattern part from Vintage Avenue in Thailand???

    While I ponder that at least I can get new spokes made up... Ashs Spoked Wheelz in Brisbane have given me some pricing and I am also talking to Fastline Spokes in Melbourne. Either way they will be Stainless spokes and still cheaper than buying NOS OEM Spokes.
     
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  5. Murdo

    Murdo The Good Doctor Staff Member Contributing Member Ride and Events Crew

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    I see your spoke problem. I have used the Thailand ones in a few bikes with no problems, even my SL125.
    That rear hub would be ok as the steel bushes have rusted and swelled enough to crack off the alloy bits then they will never come out now. What about cleaning the hub and laying some alloy weld over the steel bits and grinding smooth.
     
  6. risky

    risky risky

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    saw that photo on facebook too.
     
  7. Andych

    Andych Moderator Staff Member Premium Member Contributing Member

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    My Bike:
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    Only issue with that is that the rubber has collapsed on the Cush Drive bushes so they need replacing... added to that the alloy is like honeycomb and is falling off.. so this hub is done and dusted. I have a couple of leads on 2nd hand replacements that will hopefully be ok, depending on the price. Some people are wanting silly money for stuff that is rubbish and I can get the Pattern Part for under $100 and it has new bushes in it (they are $30 from Wemoto).
     
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  8. maelstrom

    maelstrom LiteTek Staff Member Premium Member 250cc Vendor Contributing Member

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    The companies that do die casting of automotive products here in Thailand mainly exist to service the OEM Japanese manufacturers. If the hub is made in Thailand then I don't think you would have any issue with quality. What amazes me is that someone would pay for the tooling. When I have spoken to them the cost is mind boggling.
     
  9. Andych

    Andych Moderator Staff Member Premium Member Contributing Member

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    I know that Wemoto sell Front and Rear hubs for them, as do CMSNL.
    Wemoto don’t always have stock but are reasonably priced but CMSNL seem to charge Almost OEM pricing.


    Sent from my iPhone using Tapatalk Pro
     
  10. Andych

    Andych Moderator Staff Member Premium Member Contributing Member

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    OK, so my Thai rear hub arrived during the week and looked to be pretty good... until I looked at the brake side of the hub... the old one and the new one side by side...
    IMG_6054.jpeg

    On checking bearing sizes I am pretty sure this hub is for a CB125 with a smaller bearing on the brake side...
    The SL125 uses 63020 (45mm OD and 15mm wide) bearing both sides but the CB has a 63020 on the driven side and a 62020 (35mm OD and 11mm wide).
    After a bit of wrangling with the eBay seller he gave me a full refund and didnt want the item sent back (they must cost him peanuts) so now I need to make a decision... Use the hub (get myself a 62020 bearing) and get a ring made up to go over the outside spigot to match up with the brake backing plate.
    It goes over the spigot by about 15mm with a mm of clearance and probably protects the bearings from brake dust etc.

    Or do I keep looking for a good SL125 rear hub?
    The bike will see very little (if any) off road action so the slightly smaller bearing on the one side at the rear shouldnt pose too much of an issue... others thoughts???

    My new front spokes are coming this week from a company in Melbourne. They will be Stainless steel with plated brass nipples.
    The rears he is waiting for the butted stock to come in from Taiwan. Hopefully that will be in late next week. They are also SS same as the fronts.
     
  11. Murdo

    Murdo The Good Doctor Staff Member Contributing Member Ride and Events Crew

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    Is there enough metal to be able to bore it out for the bigger bearing?
     
  12. Andych

    Andych Moderator Staff Member Premium Member Contributing Member

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    Unfortunately no, the OD is 46mm and the bearing OD is 45mm..
     
  13. KiwiMat

    KiwiMat Active Member Premium Member

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    Nice build Andy!!
    My first build was a 73 SL125, 25 years ago, ended up having a busted primary idler gear (about the last thing to come apart on the bottom end) so on advice, i got a good XL100 bottom end and used that with the SL125 barrels and piston, only mod was the cam chain tensioner lugs had to be filed down half way to sit properly on assembly. Turned it into a 5 speed. Great fun, plenty of poke for a 125cc.
    Looking forward to more pics of this build.

    Cheers
    KiwiMat
     
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  14. Andych

    Andych Moderator Staff Member Premium Member Contributing Member

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    I bit the bullet and had a guy in Melbourne (Fastline Spokes), the fronts arrived late this week so I got stuck in and laced up the rim, then set about trueing it up... it was much easier this time. I think it is the spokes not that I am better at it.. lol
    Managed to get it pretty good considering it is a Chinese alloy rim and there is a very distinct bump where it has been welded together when you spin it.. but it is less than 1 mm up and down and around the same side to side... easy close enough for this bike.
    Hopefully the rear spokes will be done soon so I can lace up the rear.. I will use the hub that came from Thailand (didnt cost me anything as I git a full refund) and will order the right brake side bearing this week.
    Little by little I am making progress.
    IMG_6070.jpeg

    IMG_6067.jpeg
     
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  15. Andych

    Andych Moderator Staff Member Premium Member Contributing Member

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    My Bike:
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    So..... Last night after the Mighty Panthers shut down Melb Storm I figured I would start on lacing up the new new (wrong one) hub. All was well until I needed to lace in the Outer spokes... no way was that wheel going together.
    I figured it was me and decided that I would tackle it again today.
    Same thing.. it wasnt me...
    I took all the spokes back out.. grabbed the old hub (never throw anything away) and tried lacing it up... easy as pie.. ineer spokes fine, outer spokes fine.. so.
    It looks to be almost impossible to get a good rear hub for the SL125 (or SL100 even). XL's are a different hub so I cant go that way (they are rare as well) so my next option is to do what @Murdo suggested and clean up and use my old one.
    So I spent some time today re-configuring my Vapout Blaster so I can fire it up again and clean up the old rear hub... I might build up the missing (corroded) with some expoxy just to make it look nice and go from there...
    Seems to be 1 step forward, 2 steps back with this one and the SRX lately.. but I am making headway. Hopefully it will be a roller again next weekend... or the one after lol.
     
  16. 2valve

    2valve Well-Known Member

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    Hi Andy
    Looking good there mate , it's coming together nicely. Another bike being brought back to life :thumb_ups:.

    Would you happen to have the part number for the rear hub your after , i'll do some snooping around for you. I might know a guy ;).
    Still have a good giggle over this statement of your's :lolsign:.
    Quote : Ummm excuse me?? You are the one that manages to come up with NOS stock from vague contacts that you wont divulge lol.
     
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  17. Andych

    Andych Moderator Staff Member Premium Member Contributing Member

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    But it is true....
    42610-110-790 Same hub as the SL100K1, K2 and K3. These little devils are a bit rare... similar to Unicorn droppings.
     
  18. 2valve

    2valve Well-Known Member

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    Hi Andy
    Thank's for the info. I'll ask for you just in case.
     
  19. Andych

    Andych Moderator Staff Member Premium Member Contributing Member

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    My Bike:
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    I decided to get the Vapour Blaster operational again after moving... and after much fluffing around managed to clean up the rear hub... The new smaller insert I used in the blast nozzel didnt work well at all.. it restricted the slurrry flow too much and as such used more air for very little cleaning power... still it did what I wanted.
    The hub and the brake backing plate came up OK... definitely not going to polish this one so paint was the go.
    All painted... now waiting on another bearing and rear sprocket so I can lace up the rime and get the tire fitted etc.

    This is before
    IMG_6129.jpeg
    IMG_6130.jpeg
    IMG_6131.jpeg

    And After
    IMG_6133.jpeg
    IMG_6134.jpeg
     
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  20. risky

    risky risky

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    marvellous.
     

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