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Honda Trail 125 Forum

Welcome to the Honda Trail 125 Forum! We are an enthusiast forum for the Trail 125, Hunter Cub, CT125 or whatever it's called in your country. Feel free to join up and help us build an information resources for this motorcycle. Register a free account today to become a member. Once signed in, you'll be able to participate on this site by adding your own topics and posts, as well as connect with other members through your own private inbox!

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  1. Thepen

    Hondukie trail 164 with rod mount

  2. Thepen

    HONDA CT125 Big Bore Kit

    They say its recommended, I slapped it on since its so cheap anyways.
  3. Thepen

    Airbox mod/restricted intake

    Its a 30mm tb from yuminashi along with the matching Tb ---> cylinder head runner
  4. Thepen

    Airbox mod/restricted intake

    Yes, I ended up experimenting a bit and decided to just throw a pod filter straight onto the throttle body, Do not try that, I wouldn't mod anything with the air intake system unless you have strict control over your AFR's. I went on a ride with that pod filter and ended up swelling/scoring the...
  5. Thepen

    Air flow

    Yes, I ran a pod filter , and the stock piston swelled up , do not recommend
  6. Thepen

    Engine Assembly at factory

    I know this isn't a Honda engine, but I'm assuming our engines got put together the same way. Its funny how we're all tip-toe'y about torque specs, and they just impact everything lol
  7. Thepen

    Extremely tight step assembly (footpeg bits) bolts?

    Just like @m in sc said, 6 point socket and you're golden. Plus you'll have a years worth of fuel saved from the stealerships labor cost :D
  8. Thepen

    Opmid multimeter, oil can alarm symbols after the ignition is switched on.What could by the reason for this ?

    Witaam krzysiek1! W wkoncu jakiegos rodaka tu widze! Gdzie sie znajdujesz ? Domyslam sie ze nie w Pl bo nie widzialem jeszcze tam ct 125. Pisz na private jak cos bo sie pogniewaja na nas :p
  9. Thepen

    Air intake

    30 mm yuminashi throttle body along with the matching manifold
  10. Thepen

    Air intake

    For the most part, if you just do the 143 + the pcx 150 injector, it'll be more Torquey, definitely noticeable. Top speed might improve some but not significantly, maybe a couple of mph.
  11. Thepen

    New project. 100 twin (YL1'e'. Twin Jet)

    That's so cool! Never even knew that these little twins existed. What's the plan, restoration? Seat kind of looks like that double seat you can get for the trail lol :p Not my glass of whiskey as well.
  12. Thepen

    Yuminashi 238 cam

    @m in sc covered this in a thread. He pioneered the ct 125 yuminashi 143 bbk + pcx 150 injector + efie mod. Swapping the injector for a bigger one on the 143 doesn't necessarily give you better power, its just to trick the ecu into not running too lean for that bigger bore. Because the ecu...
  13. Thepen

    Yuminashi 238 cam

    A racer is great, but only in conjunction with the af2 module, obviously, far better than the pcv I have in my 701
  14. Thepen

    Printed up some Trails

    Just ordered one too! Thanks!
  15. Thepen

    Air intake

    The air filter? I put on the uni pod filter, fitted it straight onto the throttle body After I scored that cylinder and piston I went with a 143 yuminashi kit and the aracer standalone ecu to control the fuelling I also have a different (bigger) throttle body now which required a bigger...
  16. Thepen

    Air intake

    I have, but if you don't have a fuel controller I don't recommend it. I scored my piston on my stock cylinder with the foam pod filter directly on the throttle body. Was running WOT for a couple of miles and I guess the stock ecu wasn't correcting enough, running lean and hot.
  17. Thepen

    HONDA CT125 Big Bore Kit

    I don't know a good one that fits the ct 125 without extra modifications. I tried the Morin oil cooler, which bolts the "inlet" of oil from the left lower head-stud, but unfortunately that port has very small pressure and it wouldn't circulate the oil. You could maybe do the Oil cooler + kitaco...
  18. Thepen

    HONDA CT125 Big Bore Kit

    I wouldn't do the 164 kit, without a proper fueling solution. I would go with the 143 + the 140cc injector + the efei at the minimum.( search @m in sc 's Efei guide on the forum) The 143 even with proper fueling runs decently hot compared to the stock bore, I don't want to know what the oil...
  19. Thepen

    HONDA CT125 Big Bore Kit

    Because even the stock parts are so cheap. That cylinder you get with the kit is literally a genuine honda cylinder thats resleeved to accept the bigger piston you get. The piston is not a Honda one but for the price looks fantastic. I did the work myself, and it also was the first time I've...
  20. Thepen

    HONDA CT125 Big Bore Kit

    Hey Paul, from what I've seen, that particular kit had a issue with the sizing of the piston(?). I remember seeing @m in sc having problems with that kit. This one is a good kit, especially for the money: https://www.yuminashi.eu/143cc-56mm-light-bore-kit-msx-sf-grom-sf-monkey-125/ Both me and...
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