125cc pitbike rebuild [Can we fix it?]

In this video i am rebuilding the top end of a 125cc pitbike. Iam installing a new piston. and iam shoeing you how to do it yourself! I also show you how to hone a cylinder. and how to rebuild a 125cc pitbike. the brand is YCF and the pitbike model is YCF 125cc lite. this is one of the cheapest pitbikes i ever bought.

[@aaraar689]

Cool project i would love to have a pitbike

[@cassturner2922]

Great fun

[@kingkong81icloud]

Isn’t it worth putting a Japanese piston an rings in , I used to get bikes I had 4 Yamaha DT125R, an I was always told make sure you buy a Japanese piston , about 20 years ago I ended up buying 4 Yamaha DT125R, made one faster than a YZ

[@RoyoPitbike]

Nice bike and repair !!

[@TroyLauffenburger]

how could you not see your fuel line is kinked

[@appel592]

What kind of oil did you use for the new cilinder? Just 4stroke oil?

[@Builditathome-Restoration]

10w40

[@Potato37184]

​@@Builditathome-Restoration 10w40 4t or 10w40?

[@Ygunknown]

Hey man I have a similar pit bike, the kick start only goes down if the clutch is held in but has no compression when it dose kick down just goes straight down. If clutch not held in it doesn’t kick down just stuck, if you would know why like it needs a full rebuild or worth fixing would really appreciate it I can’t find any information on it. If u don’t know that’s okay man

[@ikilltrees666]

Someof these little bikes will only kick with clutch out. When clutch is in it does not engage. If yours isn't turning it could be stuck or seized, can you roll it in gear?

[@Dirtbike119]

It’s bogging when you rev it wide open check the valves and clean the carb out

[@christerfer409]

What size are the bigger wheels and tires?

[@Builditathome-Restoration]

I think 14 inch in the back 17 in front not 100 sure

[@ryanrott5917]

Is this a dry or wet sump?

[@Builditathome-Restoration]

Wet sump

[@AmberlyMccombs]

So I took my dirtbike mudding and in the middle of the mud my dirtbike turned off and hasn’t started since I took my whole dirtbike apart dumped out all of the gas took my nibbi carburetor off cleaned it and I took my engine off and took the engine apart drain all the oil and then I put everything back together put new oil in it and new gas and it’s still not starting and now there’s something leaking out of my bike and idk what it is and it still won’t start and it has compression but not as good as it should do you know any reason why it wouldn’t be starting still or what would be leaking out of my engine?

[@pollodormido2]

You saw in the Video it was the cdi

[@KevinMartenUglin]

where did you order the piston from?

[@Builditathome-Restoration]

Aliexpress diameter was 52.4 mm i think

[@ameerisaacs9529]

what size is that piston ? and won’t the compression change due to different depths of the piston ?

[@ManuelMorfin-s8x]

What if I don’t have a way to hone the barrel

[@Builditathome-Restoration]

Use 800 grid sand paper

[@Antonandgeorge]

Buy another one there like 20-30 quid

[@deyandeveld]

Ik hoor gewoon dat deze man Nederlands is

[@rixa.]

Where did you get a piston for 10 euros??

[@Builditathome-Restoration]

Aliexpress

[@DaireFagan]

if you dont mind me asking how tall are you

[@_mazda_mx5_]

He sounds Dutch, So probably pretty dang tall

[@alexmontalvo952]

I had one jst gotnit

[@alexmontalvo952]

And it blew up after the second time riding it

[@alexmontalvo952]

I’m lowkey a bit pisses Idk what happend it was riding good until I shifted wrong then turned it off then it blew up

[@lunantix]

It's still chugging oil😂

[@jcstuningltd]

he missed the oil ring on the cylinder

[@winstonhd68]

😂

[@llesurFigueroa-lk3fe]

You got the wrong piston they make a big and small valvle of those motors think you got the low comp piston

[@will17527]

Might need new oil gide valves stop that smoking