Fix your Mini bike Carb - bogging, cutting out etc

If you are having trouble with your mini bike/quad whereby its difficult to start, bogging down, cutting out or overflowing then this video could help you get it running sweet.
Of course i would check firstly that there is compression, (the pull start should be difficult to pull slowly) and that there is spark. Do that by removing the spark and with it still connected to the HT lead, Place it against the cylinder and pull the starter. You should get a spark arcing across.

Carbs are pretty much the most common of all problems on these mini 47 and 49 cc engines and that can be anything from overflowing, which is caused when the float gets stuck in the bottom of the bowl or when the cut of valve gets stuck open too, to cutting out and bogging down, This is usually a blockage of the main jet. It is very important to keep the jet clean and to make sure you can see clearly through it as seen in the video. if you get dirt in here then less fuel is able to get through when on open throttle and the bike is starved, causing it to cut out or loose revs.
make sure to get the 2 stroke ratio to fuel right too. A lot of the blockage problems are generally caused by having too much 2 stroke mixed in and it turns gooey after a while.

[Bottlecapmememaker]

this pretty much fixed all my problems on my 4 year old chinese dirtbike (which is still suprsingly running)

[jsmith]

Thank u brother. Im no mechanic but i bought my daughters a quad for their christmas and it worked for one day. So I've spent at least two weeks learning everything i need to know about these mini quads to make sure i get it working for them! I'm certain my fuel was contaminated. Quad starts and cuts out in less than 10 seconds so its gotta be carb. Replacing inline fuel filter in the morning, and spark plug has already been replaced. So if replacing fuel filter does not work, my next step is cleaning the carb. You have made this easy for me to learn, and may just have saved my ass and handed my daughters a fun day out tomorrow. Much appreciated 🧡

[braydendoucettechannel]

Thanks Man, i’m currently working on a 50cc pocket bike, and there is gas overflowing everywhere, this is very simple and helps a lot thanks man

[raptorgames]

My coleman bike starts but jumps and jerks while riding. Sometimes it just shuts off. It's unsafe to ride it with the jerking. I cleaned the carb and changed the spark plug, but it still does it, any ideas?

[jamescoleridge]

Thanks for the tips, now I can raise hell on my ancient mini Moto in this lockdown

[CptMishMashVonRandom]

Your very welcome mate, glad to help you out. Just make sure the bearing isnt damaged in the bell housing from the chain being too tight. that can also be a cause of the clutch failing so have a look at that before fitting any new parts. :)

[paulbarker]

This video is brilliant little bike is running sweetly now, only problem I had was getting carb on and off bike.😤 the fixing screws are Phillips and it was hard work getting access. In the future I'll replace them with hexagon head bolts.

[rusotz]

Thanks Cpt MishMash, this really helped today as I put together a project pocket bike for my kid. Cheers!

[CptMishMashVonRandom]

Hi, The fuel tap work by allowing fuel through a small "half circle" shaped channel in the underside of the tap itself. When you turn it off the channel no longer lines up with the inlet and exit for the fuel, so no fuel gets through. Its assembled by first placing the rubber seal into the housing, then the spring washer, then the tap, then flat "U" shaped washer and then finally the retaining plate. You'll feel slight resistance when its fitted correctly. :)

[CptMishMashVonRandom]

Hi, you need to fully extend the pull cord, then with it all the way out, you rotate the spring loaded disc on the inside of the pullstart mechanism until the spring gets nice and tight. then you allow it to retract the pull cord which is still fully extended at this point. It will rewind the cord and you'll be back in business. :)

[paulrockett]

showing my 12 year old daughter this as she needs to know how to take them apart useful info thanks :)

[CptMishMashVonRandom]

Yeah it could be indeed. If theres any crap in there, or even if the seal is broken down it can cause an obstruction that prevents the engine from properly fueling on throttle. It can often seem perfectly alright on idle too.

[CptMishMashVonRandom]

Hi, you'll see lots of people have posted the same question. Its likely that the overflow jet is clogged or the float is stuck, it can have sharp edges on it from manufacture and causes the float to get snagged inside the bowl. :)

[CptMishMashVonRandom]

The substance on the screw is actually used in order to prevent the screw from coming loose and allowing the idle to get messed up. To remove the carb you first need to take off the filter, then the filter adapter as its covering the bolts that secure the carb to the inlet manifold. Its quite simple really.

[CptMishMashVonRandom]

@23cross I cant post links here, but just search "minimoto carb", "cag carb", "47cc carb" etc and you should have no problem finding one. they are pretty cheap too but id advise stripping and cleaning it as shown in the video before fitting it. they are usually pretty dirty straight out of the box.

[richardhernandez]

i have a small quad that has the same carb and i cleaned it well replaced gas lines aswell as fuel filter and when i start it it will run but lile 3min later it will die out and turn off. sometimes it will still start sometimes it wont. Thanks for ur time :) (BTW GR8 VIDEO)

[AbundanceRun]

Helpful video and good note in description box

[Pseudopok]

What should I do? I don’t get gas into the carburetor on my mini bike?

[CptMishMashVonRandom]

Thanks mate, i know it looks scary but its actually pretty easy, I've had my 4 and 9 year olds help out and they know how it goes together. :)

[michaelfirman]

Video was very simple and to the point. nicely done. thank you.