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58 comments on “Top 5 125cc Motorcycle Faults and How to Fix Them

  1. Touch wood I've not had many issues with my Zontes, but it's nice to see this video just in case! I've never needed to adjust my idle screw funnily enough – the bike seems content with the choke she came with, funnily enough haha. I like your bike as well, although I'd definitely have cafe-style bars on to complete the look. 😉

  2. lovely bike, but errr what is it? it looks like the sinnis cafe/moto valient/sinnis scrambler/bullit,,,who makes this 1 and is it cheaper, i only wanna spend a grand,,cheers tom

  3. Very interesting. I've planned to buy the Lexmoto Valiant which looks a bit similar. Hope I'm not gonna have these problems but at least now I know how to fix them.

  4. How about just making sure your tank vent (in filler cap) is not blocked?

    It's not a manifold, its just a header pipe. But on no bike they should come loose, it's the other way around, they get stuck.

    Seems like very shoddy build quality ?

  5. Should have bought a sinnis I had a vista for four years not one fault now got a sc125 now a year old no faults also they are cheaper.

  6. Love the classic look of it. WD40 and silicone spray are always a great help fixing this small gremlins and perfectly valid for Japanese bikes also. A tiny squirt in the key holes, or in the electrical contact plugs make miracles on the good functioning of those components. Thumbs up.

  7. I've got a 125 and need some helps desperately. My bike has never had a problem but the last two weeks I've noticed when I'm full throttle in 5th as soon as I come off the throttle Togo around a bend for example, if I get back on the throttle there will be a hesitation for a second then it will pick back up. It's quite a big hesitation but don't know what this could be

  8. Or you could do your self a favour and not buy Chinese!! The leaking petrol on a hot engine fault, is pretty scary! just dont bother!! I think I would rather buy a pushbike!!

  9. Gringo Tom, Thanks for this video. It has made me feel so much better than I would have if I hadn't watched it before buying my Herald. All these issues have pop up on my bike in the first 600km. I would have been well pissed if I didn't know these where common problems.

    Where did you get the Red bike stand from?

  10. Thanks for the review. I was considering buying a Herald 250, but I don't think I will bother now. Not until the manufacturers address these issues.

  11. Fault 1:- Check and clear the breather vent in the fuel cap.
    Fault 2 :- Clean the air filter and check for air leaks making the mixture lean.
    Fault 3 :- regular checking and if necessary, re-tightening of these bolts should be carried out as part of regular servicing.
    Fault 4 :- see fault 1. but.. all fuel tanks should be pressure tested at the factory so if it's leaking, send it back!
    Fault 5 :- This is the only genuine fault you highlight on this machine that did not originate from a lack of maintenance and unfortunately can be expected from what are otherwise very reliable bikes! Chinese machines use cheaper versions of Japanese components in their electrics and while they work fine, their reliability is not up to Japanese standards yet!
    My advice here is to replace with a regulator from either a YBR125 Yamaha, or a CG125 Suzuki as they will probably outlast the rest of the machine and are the same regulator!
    If you find a faulty regulator, have your battery checked too as they can be damaged by a bad regulator and boil dry!!

  12. I got a solution for all those problems. Instad of going chinsese built bikes… go for the suzuki ones that are the exact same but built (put together) and QC by a Japanese company. Meaning gs/en/gn 125. Ive had mine for almost 3 years now… no hassle.

  13. Don't label all Chinese bikes with these problems, I have a Sinnis Apache which is 4 years old and, has had none of these problems, in fact, it's had no problems at all. These bikes are as good as any Japanese bikes I have EVER had, remember, Jap bikes had bad press back in the 60's & 70's now look at them. I also have Ducati 749 so, why would I bother with a cheap crappy Chinese bike? Because it's great around town, economical, light weight, inexpensive to buy – should I go on?

  14. Smearing either silicon gasket goo or exhaust paste onto the threads of the exhaust manifold bolts will stop them vibrating loose yet will allow them to be unscrewed with a socket wrench when needed. (A very old biker's trick).

    The welds on the gas tank leaking is caused by the 5% ethanol content of the unleaded petrol we now have destroying the resin in the sealant material the Chinese manufacturer used. China does not contaminate its petrol with ethanol yet so still use resin based sealants. It's a problem that classic bike owners are familiar with.

    Use a ethanol and acetic acid (what ethanol degrades into on contact with air in the gas tank which causes it leach iron from the steel and eventually clog up the carb) resistant gas tank sealant.

    Chinese 125 bikes now last as long as 1970's and 1980's Japanese 50cc to 250cc bikes did back in the past (15,000 to 20,000 miles unless it was a Honda CG 125).

  15. The first thing you check if bulbs are blowing frequently is that the wiring has a good earth connection. Once you are happy with the wiring loom it's time to check the alternator output and the function of the reg/rec. The most common mechanical fault on small motorcycles (of ANY make) is valve adjustment – particularly on machines abused by learners. In UK Haynes publish a manual specifically aimed at servicing small Chinese bikes. It is well worth reading as well as the owner's manual that comes with each bike 🙂

  16. we know you don't need a super expensive bike to have fun.  a cheap bike will keep you busy and entertained. good video.          I'm looking into buying a Chinese bike myself.

  17. You might try putting a thin piece of rubber between the gas tank and the frame. It might help to absorb vibrations. Like an old piece of inner tube.

  18. the quality is getting better however for the same money as a new Chinese bike you can pick up a second hand decent bike or if your lucky you’ll pay even less (eBay and gumtree both great for this) and you’ll find the problems just don’t happen anywhere near as often with regular and properly done maintenance and servicing. At the end of the day it’s personal choice but I know which I’d rather ride but still that is a good looking bike and I hope you enjoy every second riding it

  19. I'm not sure if these 125cc's are essentially from Shineray Company in China. We have the 250cc version from Shineray as a cheap entry for a Brat/cafe racer style Learner's bike here in Oz. It looks good, but I was warned by several local mechanics in my area to stay away and they refuse to work on them. I wanted to buy one, but with no local mechanic to service them, means I won't buy. Apparently they said getting parts here is a problem, which is strange as we are in Asia/Pacific.

  20. thank you very much , its the little things like these that can lead to bigger problems potentially later .. so thanks again ….

  21. great video- i have same basic bike. I really need pillion foot pegs and a tail light to get it through its MOT- neither of which I can find despite scouring chinese motorcycle parts! any ideas?

  22. Is there any difference between the HMC 125 XF and Classic? I got the XF model (2012) and it looks exactly the same

  23. 2019 bikes have been improved since the Euro4 regulations came out. But of course regular maintenance and checking nuts and bolts as well as visual inspections is a must with any bike.

  24. Thanks for the upload. Have you ever had ignition coil problems (when running hot it sputters, dies, and is almost impossible to start)? Since you changed your voltage regulator (which could be the cause for an overheating coil) I'm wondering if you ever had that problem. I'm thinking of changing the coil but maybe I should start with the regulator, what do you think? Cheers.

  25. That is the idle screw the fuel adjustment screw is on the bottom of the carb where it's bolted to the inlet manifold

  26. There something wrong with all the 125s unless your paying over 4K for a Kawazaki, as for this it looks very retro, almost like a Honda 250 dream i used to ride. The sexiest bike ever!

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