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  1. #1

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    Default Carburator needed for 1978 Honda xl 125

    My name is Dennis. I bought a 1978 Honda xl125 dirt bike not aware of the fact that parts were hard to find sometimes for this bike. I need a carburator for this bike. If anyone can be of help, please do so. Thanks
    Last edited by Hardrock; 09-04-2020 at 7:22 PM.

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    First rule of the internet, never post your phone number since bots can spam you.

    Your Honda is actually well supported. Check (and ask if necessary) Honda forums for factory service manual downloads and links to online parts suppliers.

    https://thumpertalk.com/forums/forum...ge-dirt-bikes/

    https://hondaforum.com/forum/offroad-26/

    I would ask about the cheap aftermarket carbs (carbs shouldn't cost squat anyway for what they are) to check buyer experiences. I run them on riding mowers and chain saws (after dropping the float bowls and inspecting them) and if I needed a carb for something like your machine would give one a shot.

    Honda made millions of their small engines and there should be many possible carbs that would work including upgrades. The exact year is not at all critical.

    http://wincycles.com/p1022/Honda-XL1...duct_info.html I would ask their tech support for your best option.

    Enjoy your Honda.

  3. #3

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    Thanks. I have searched widely and no luck so far. That Year 1978, there are no aftermarket carbs available that I can find. I am not a mechanic, but my mechanic says other carbs will not work.

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    Also thanks about the phone number!!!

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    You obviously didn't look to damn hard they are all over ebay......... Just put in Carburetor Carb For Honda CB100 CB125S CL100 CL125 S90 SL100 SL125 TL125 XL100 S

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    but my mechanic says other carbs will not work.
    Find a real mechanic since that one appears to be helpless. (I am one as are many on this site and other forums.)

    Better yet, study a bit and become your own mechanic which will save you absurd piles of money over your lifetime, more than pay for the tools (which you get to keep), and most usefully empowers you to fix what you own when it malfunctions instead of paying someone else.

    Your Honda is ideal to learn on being quite simple and a very well-known machine.

    The parent company who built the OEM carb can recommend a replacement carb if you contact tech support (your mechanic should have known that, too).
    https://www.keihin-na.com/aftermarket/pe/

    If you have an original carb however trashed use the jet sizes etc for reference. Another alternative is a good used carb which is easy to clean and rebuild yourself and learning how is a very good idea. They use JIS screws (not Phillips) and the cheap Vessel kits are excellent. https://www.amazon.com/Bessel-Vessel...334245&sr=8-36

    I soak carbs in undiluted Pine-Sol or Simple Green then slosh the body in a tub of hot water. Small parts go in a coffee strainer or other finely screened strainer. I work over a tray so no small bits escape and organize the parts in cheap clear Walmart fishing tackle boxes (Flambeau, etc).

    Random Ebay used carb example:

    https://www.ebay.com/itm/Honda-XL125...YAAOSwX59fT~ZC

    Keyster make good rebuild kits.

    Example search of Honda online part supplier:
    https://www.hondapartshouse.com/oemp...2/carburetor-2 then got to 12, carb assembly to get that part number.

    https://www.hondapartshouse.com/oemp...arburetor-assy which is not available from Honda but now you know one of the OEM Honda numbers to play matchup with ordering rebuild kits for that number and hunt replacement carbs.

    Now get thee to Honda and Thumpertalk forums and ask what's currently recommended as suppliers change.
    Lurking isn't always sufficient but the fucktillion Hondas out there didn't suddenly become scrap due to lack of OEM carbs. This guy got a PE 28 to work and you could message him as well as post a thread asking about replacement carbs and jetting. https://thumpertalk.com/forums/topic...just-shoot-me/

    You may also find this useful: https://www.youtube.com/watch?v=URId5EA9pdI

    I hunt tech data for everything. Random example instruction sheet for a PE 28 clone: https://img.webike.net/catalogue/10432/03-05-0032.pdf

    http://www.vintagebikebuilder.com/ch...ket-carbs.html is worth a look.

    Many if not most bikers who wrench became mechanics because dealing with so-called mechanics pissed us off. My mentor became one for that reason and so did I.

    So can you. What one man can do, another can do. Have fun!
    Last edited by farmall; 09-05-2020 at 3:29 PM.

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    Every carb that comes up on Ebay for xl125s, when you select that carb to get more details, the first note that pops up is "this will not fit the 1978 year model" and that is all I can find.

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    Quote Originally Posted by Hardrock View Post
    Every carb that comes up on Ebay for xl125s, when you select that carb to get more details, the first note that pops up is "this will not fit the 1978 year model" and that is all I can find.
    Have you asked why they won't work???????? It should work............

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    Quote Originally Posted by Hardrock View Post
    Every carb that comes up on Ebay for xl125s, when you select that carb to get more details, the first note that pops up is "this will not fit the 1978 year model" and that is all I can find.
    Listen to what Farmall is telling you. Ebay will say it doesn't fit because they are sellers, not technical experts.

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    Does it have a boot on it for a spigot mount carb? If so, measure the ID of the spigot and go to Sudco's online catalog. They sell the mikuni roundslide carbs for a pretty reasonable price. Good carb for most bikes like this. The only reason I can think of that it wouldn't work is if Honda was using some kind of electronic connection to the carb as some were starting to try at the time. If the boot is still on there, I would take a close look at it and most likely replace it, as they tend to dry out pretty quick. The only things I was able to find on it is that it is a roundslide carb, so the Mikuni VM of the proper size should work well.

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    The (excellent) Mikuni option was also included in my previous post. I did not put that link there by accident nor the link to the gent who successfully used another carb. I suggest OP read my posts for comprehension and not skim them.

    http://www.vintagebikebuilder.com/ch...ket-carbs.html


    If there is an electronic connection to the carb those can be disposed of but it's not visible in the parts breakdown.

    Per this exploded view and others there are no electronics (lik valves) connected to the carb which is a spigot mounted round slide carb (and note I also linked Keihin themselves so OP can get info direct from the manufacturer on the later slide design carbs Keihin replaced the early units with).
    https://www.bikebandit.com/oem-parts...m9496sch402654

    Here is where to buy an appropriate new Keihin (but if it were mine I'd go for a Mikuni, either way there are plenty of them in usable bore sizes).
    https://www.sudco.com/images/Catalog37PDF.pdf

    To adapt some carbs a different carb boot may be required. Here's an immaculate example from the Mecum site with plenty of pics showing the carb. Since that was a late-ish year the carb may be larger diameter than previous (a good thing because every fractional hp matters) and a larger bore may mean a larger spigot OD meaning a different boot (which is no big deal to replace, and if an older boot and carb bolt on the mismatch would be minor). https://www.mecum.com/lots/CM0616-24...-xl125-enduro/

    Some aftermarket cheap carbs are sold with a new carb boot (which frequently harden and crack so a new one is nice to have. If their bolt pattern matches or is close enough on the cylinder head side and the bore is plus or minus a couple mm they'll do the job. These are not highly tuned GP bikes and have a lot more in common with outdoor power equipment.

    Example view of head including carb boot: https://www.cmsnl.com/honda-xl125-19...p_12100383010/
    Larger image from that link: https://images.cmsnl.com/img/partsli...e3301_1789.gif
    Boot is #11 and gasket is #13. I'll leave it to OP to track down those numbers as an exercise and see what else they fit.

    This is a fine opportunity to study every aspect of your machine, learn carb theory and how those (pleasantly simple) carbs work.

    To buy the right bits you need to study enough to know MORE than most sellers.

  12. #12

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    Thanks for your help, I am working!

  13. #13

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    What is the spigot?

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