BLOWN 125cc TURBO Motor TEARDOWN Go Kart | Part 9

We tear down our turbo 125cc go kart motor to see what went wrong when it failed on the dyno.
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➡️ Instagram @itsmikelake

[@itsmikelake]

Missed an episode? Watch the whole 125cc Turbo build series HERE! kzbin.info/www/bejne/eJyrh5SIeap0ors

[@trevevns3242]

@itsmikelake Hi love the vids ❤ the kàrt looks mint not sure if anyone has suggested this yet. So my suggestion is do away with the electric start (I know it's not ideal but easy to get around) the reason behind this is so you can install an inner rotor kit this allows the engine to free rev up to 14000 rpm with stock flywheel and ignition the 125cc motors make 9.5kw @9500 rpm (max the stock flywheel will allow it to rev) if you do an inner rotor kit port the head and intake runner do valves and timing I like the double head gasket idea not sure if you will have trouble with chain length thought I guarantee if you do the inner rotor kit you will be surprised the gain. Just beware some kits are hit and miss with tolerances. Hope you look into it keep up the great work ❤

[@driftle3341]

Valves Kit Intake Exhaust Valve Assembly for 125cc ATV Quad Dirt Bike Go Kart

[@driftle3341]

New Head cam 125cc piston 125cc parts

[@rakeshpersad4289]

I'm your newest subscriber 🎉 hope you keep up the work

[@shaneanning180sx]

Wonder if it was valve floating and hit piston those stock springs are pretty shit

[@jamesmills6437]

That's literally what I was thinking just seen ur comment after I posted lol

[@st8jkt69]

💯

[@OPARTEOMGAOERFAFAA]

custom valve need?

[@OskarAxl]

And bigger exhaust? Maybe too much back pressure

[@motabikeboy]

​@@OskarAxlIt definitely does not need a bigger exhaust...

[@jeveuxresteranonymemerci]

hi ! To solve your valve problem, you might have to ubgrade the valves springs. love your videos, continu like that !

[@Bullwinkle39]

Id check the keepers as well

[@SkyfighterZX]

Didn't the guy at the dyno say "you dropped a valve" ? Dude nailed it xD

[@matthewf1979]

Upgrade the valve springs to something 3 to 4 times as strong(valves too if you can). I bet the valves were floating at high rpm and the piston hit the intake valve. At least these engines are cheap and very easy to work on. Good luck with the next iteration!

[@lineoflads1388]

I’ve really enjoyed this series keep it up!

[@itsmikelake]

Thank you! 🥰

[@Kim83rlin]

Ditto

[@VipersCave1]

Mate! That spark plug just made my day 🤣 Another great video brother 👍

[@itsmikelake]

Haha she’s toast! Thank you bro ❤️

[@JareebsGarage]

I'd check valve spring to see if it valve ans dropped thr valve, also if you wana add gaskets to lower compression do it on the base gasket side (cylinder to crankcase side) lastly I'm building a turbo 2 stroke triple snowmobile if your interested check it out 😊!!

[@corbyweeto6061]

I doubt running lean would do that, would burn a hole in the piston first. My guess is valve float, I'd get upgraded valves and springs on the next build. Also should get a 160cc. Same dimensions and mounting points I'm pretty sure

[@eljaibas16]

Is it needed to bore the engine block so the cylinder sleeve fits?

[@dawsongiardino2802]

All the Chinese pit bike engines use the same mounting holes on the motor all the way up to the big dog Daytona 190 motor that’s a 4 valve engine that makes 25hp out of the box

[@Mamay-zb7vb]

You can buy a big valve head and 60mm cylinder block for that engine, but you need to machined or port the crack case to fit the block. Then manually port the intake manifold to match the flow needed for the big valve head. Add turbulence when you port the intake to have maximum air and gas mixture.

[@Nohomo403]

if you don't want problems,just get one of those takegawa superhead lol.Btw,thr problem might be from lack of oil,and also the valve clearance.I have tge same engine and i noticed that this one doesn't rev as much as it should.

[@markcarasco4209]

You can bought a new head for that motor, you can search for big valve head set, and I suggest to use a racing valve spring for that since that motor was revving high. If you bought a big valve head you can port the inside of intake and exhaust for much better performance.

[@nicolasp7395]

thats true, i have and honda 97cc and revs to 9k totally fine, even 9 and a half too

[@markcarasco4209]

@@nicolasp7395 yeah I heard about those small cc bikes, they rev alot higher that what we expected them to be

[@awol31]

early I love these go kart videos makes me want to build one

[@coopereverett4962]

yea me too😊

[@mixxedboyybuilds8273]

Make sure to check the rod play. It could have toasted the rod bearing, alowing the piston to reach TDC sooner due to the inertia of the piston & rod, also allowing the piston to linger at TDC for a bit before the crank rotation took up the slop in the bearing, thus pulling the piston back down.. resulting in similar interference from the valves as a loose timing chain.

[@seanwilson4487]

There's loads of car youtubers doing similar stuff to you but the go kart stuff is pretty unique bud, think you've found your niche Love the build ❤

[@RBTuned]

Did you adjust the valve clearance? This must be done with a new engine and after 200 km of running-in

[@nicolasp7395]

next step is going to be wild! I hope one day i will do something similar! Try to buy a cams for turbo, stongers valves prings to rev more and dont me worried to happen this again! And work the intake to allow more air

[@Lucas_sGarage]

the good thing about these motors is that I'm pretty sure that they use the same gearbox from bigger engines so this one can take the torque, also they are straight-cut gears so they are tough also, throw some stiffer springs on that, usually they are flimsy (it has the same issue that those predator 212s)

[@ju5t1n78]

Dude it would be so sick to put a big bore kit on it. That could be the best next upgrade that would bump the power up alot more

[@jackbeets3309]

The fact you made a single cylinder motor boost thata well👏🏼👏🏼👏🏼

[@aaronholmes3844]

Hey mate. Take a look at the yx190. Fuel injection is capable with the starndard manafold. 5 gears, oil out and in for cooler and/or turbo 👌. Later upgrades 4 valve head and 212cc bore kit 🤤. Looks like some Daytona parts fit yx190 🤷‍♂️

[@graememcleod1751]

There's also a mini Jeep with a bunch of stuff to turbo it for sale on marketplace in Melbourne

[@bagsaye3080]

I love your stuff keep it up

[@PARKMOTORSPORT]

Valve float has done that n the piston kissed it

[@grimairbrush]

one suggestion, you may need to heat treat the parts or drop forged parts in to handle the heat from the turbo, or run water cooling?

[@Tyresong]

I would love to see where the Valve Failed, I'm picking it where it is machined for the Keeper to lock in. I am hoping the conrod is still straight and salvageable. but just like a race car, make sure you thoroughly flush out everything the oil goes through, as the gearbox and clutch is bathed in engine oil. and we all know that guy who forgot to replace the oil cooler after blowing an engine and had the new engine die straight away because of the bit's that were trapped in the cooler

[@Nitzustaja]

lifan 125 would have been one of the most reliable 125 engines, but i hope that big bore kit for your engine will hold

[@Diamondtuning1]

Buy beefier valve springs i think they are weak or the valve lash was super off

[@NightzTeam]

I don't think Engine braking on a 125cc with a big dyno was smart lol, That's alot of momentum in them rollers to float them little springs and valves

[@J.P_Sullivan]

That's a bummer, hope u can find a nice replacement variant❤

[@emanh4keem_san420]

Mike u gotta collab with Battle Aero they made a gokart chassis with TONS of steering angle lock to lock maybe ask them for making it FR layout??

[@wilsondriver654]

Could be springs, could be heat causing valve to stick in the guide? Would have been good to check if cam timing was ok before pulling it apart.

[@Ismaak5]

Boost may be keeping the inlet valve open try to find stronger valve springs

[@averyanderson6945]

If you raised the rev limit higher, that stock valve spring probably couldn’t keep up and slapped the piston

[@user-yr5iu8on2d]

You can buy big valve heads cams springs ect for those engine

[@benkappaa]

Should be because of valve float and valve mightve crashed into the piston. You probably need stiffer valve springs. Instead of new cam you can use rocker arms to adjust the valve opening. Like 1:1.2 rocker arms should push and open the valves more. Piston, crank and the rod might come as a weak points when upgrading aswell. Its better for your wallet to upgrade them earlier instead of breaking everything and buying the upgraded parts again and again.

[@RBTuned]

You can also upgrade to zhongshen 190cc engine fits on same engine mounts

[@RBTuned]

Or daytona 190cc 4v

[@dawsongiardino2802]

@@RBTunedeven a yx 150 or zongshen 155 would be a good upgrade and much cheaper than the Daytona

[@rasareicing]

tighter valve springs should help, valves will "release" and take in on faster rate

[@kelevra558]

It probably started floating. Either that or the chain stretched. The only way you ever break a valve is contact. BTW, your videos being my inspiration, im building my youngest son's old mini quad into a gigantic r/c drift car. Gonna have the body 3d printed by my little brother and im putting my sons old kx65 engine in it. The thing is gonna be a menace to society. I might put a FPV cam in it so i can rip around the neighborhood and chase coyotes and shit. Gonna be so rad.

[@StroDshiesty1]

Needs harder springs oil cooler and a thicker base gasket to lower compression & the rings to be gapped correctly

[@jamesmills6437]

That's fucked 🤣 that intake valve is toast! Even I'm not sure why it's done that cheap quality maybe? Would it possibly be cuz the turbo was pushing the valve open slightly at high rpm/max boost, because the springs are stock? Kinda like when u get value float??Anyone have any ideas I would love to know?

[@itsmikelake]

I’m leaning towards a crap quality valve as it happened on deceleration? 🤔

[@jamesmills6437]

@itsmikelake there not the best quality those little Chinese engines 🤷‍♂️ instead of boring it out like u was saying in a previous video, why dont u try get a 160cc/190cc. I'm sure u can get uprated values and shit to can't really remember it's been so long since I have had a pitbike

[@emanh4keem_san420]

engine braking on bike engine is nuts add clutch pedal needed​@@itsmikelake

[@BIN-CHICKEN]

just maybe the lack of oil prior to re-feeding the cam lol

[@itsmikelake]

That wouldn’t have an effect on the condition of the valve 🤔

[@jokke8651]

@@itsmikelake go with stiffer springs the valve was probably floating

[@JesusOffline]

it was probably just valve float, the valve springs are not made to handle boost and rpm so the valve ended up staying open and got hit by the piston

[@MasonCash27]

upgrade your valve springs and maybe valves when doing your big bore install

[@kaesvlogs94]

Valve springs weren't rated to the HP you were putting out bro... Side note.. SP tools must be stoked having sponsored you cause you never miss a moment to tell us which brand tool your using... Awesome advertising.. love your work man

[@deucemob6365]

The valve springs aren't rated to horsepower they're rated to RPMs

[@dawsongiardino2802]

You should look into a yx 150, zongshen 155 or even a Daytona 190 motor for that thing they would make more power na than that motor does turbocharged and they sound way meaner.

[@Ashixe989]

Why dont use Zongshen/daytona 190cc engine instead?

[@Getsum-ii]

If your going to bore it Use a bigger throttle body Bigger jets NO FILTER (more fuel=more air) A race cam and new rotating chain (timing) With a quarter turn throttle (max power at 1/4th throttle) then obviously youll have the bigger piston alteady ported head etc I think after tune itll be 155cc (go external) 😂👌🏼 Itll be a beast

[@Smisky]

Valve float may have been an issue, you were revving that little motor pretty hard haha. Ive had a couple stators blow on my motor because I was revving it high, but that might just be a me issue 😂

[@JshDav]

Yeah I doubt those stock valve springs are up to the task of revving that high, and with boost 😂

[@Piorex84]

To make the new kit last longer you should kinda run it in for some time

[@matthewjimenez595]

in thailand many people make drag bikes 110cc and above they sell many parts for this kind of motor you can try to buy parts there

[@yehlad]

upgrade to 140 bro way stronger and oil ports at bottom of sump should look in to it lifan engine is good

[@yehlad]

pretty cheap as well

[@speedcostsmoney4333]

Get a new ZS190 or zs212 4 valve and bolt on turbo . Love to see this

[@chlebiarz7689]

Pls instal 150cc cylinder kit on this little monster

[@itsmikelake]

I’m thinking this for sure! 😁

[@fireballchaly]

Don't use 2 head gaskets. Use 2or 3 bore gaskets. Otherwise the spacing between head and block weii be too much to install cam chain. I have ran in to that problem recently installing 2 or 3 bore gaskets instead of 2 head gaskets solved it

[@v8rangee]

in these little engines the valves are almost always the first things to go.. so if i were you ide get upgraded valves ;]

[@kennysano8691]

Don’t lower the compression there about 9:1 factory . I have a turbo 125 pit bike and you definitely need to not rev it out that high stock without a valve spring upgrade. I’m making 3 psi on two step and 9 wide open with a blow through carb setup .

[@itsmikelake]

Great info! I'm doing research at the moment and will buy some stuff this week for the motor upgrades 😁

[@rohseanrenford82]

I work on these small engine it just couldn’t handle soo much rpm with boost i recommitted a air cool 250cc timing chain it just have shape and size difference and u get more power without flying a valve

[@ABSTUNTS187]

Bro when live ya spoke on a rotary. Get a twin rotary go-kart then ya have a spear rotormotor... plus there's a few in Croydon for sale on ebay atm turbo rotary would eat way better Melbourne 💚🤘

[@jams_finest]

Look into valve float , u need stronger springs

[@WilliamWallis-gb6sz]

So with those motors when you first get them adjust the valves cause they don’t do it and that might be why it dropped a valve

[@sambroomhead7875]

Daytona 4v 150 or 190.not cheap but would hold that boost a lot better 🤘

[@11sjv]

the valve springs are really soft on those so it might have hit the piston

[@Ozzieseth]

What you can do is buy a 22mm intake manifold for the motor. A link I have put in a reply of this comment

[@Cyberreks]

u can bore out the head to fit a 150 cc bike piston in it with 150cc carb since in our country its a normal thing (people do it for racing by boring it to fit a bigger piston in it)

[@itsmikelake]

I think 150cc or even bigger is the way to go’

[@Cyberreks]

@@itsmikelake ye but they might be hard to start it with starter so keep that in mind

[@ffkejdi516]

Yo bro the same thing happend to my quad its becouse of valve float my damange was way worse i made a hole in the piston and a piece of the valve got in my exhaust . Becouse i had it in much higher revs when it failed on me .

[@justin3131ify]

Any chance the that 280zx is available for purchase?

[@itsmikelake]

Unfortunately not sorry bro! I’ll be keeping her forever 😜

[@MRCRISTICIRPACI]

Working on small engines looks so nice and easy but looks hard

[@itsmikelake]

It's very enjoyable!

[@MRCRISTICIRPACI]

@@itsmikelakeHow much did this build cost you roughly

[@coopereverett4962]

u prolly had too much torque through ur timing and it failed cause these motors are built with pretty maxed out parts u could do with some upgrades for more tourque and hp also coming with more strength and reliability

[@jasony2k-ef4tk]

Did boost push the valve down ?

[@OPARTEOMGAOERFAFAA]

i like this kart tunnig ❤❤

[@user-ip3vz4zt2h]

Dudes from Thailand doing 200kph with this engine. No forced induction 😂

[@itsmikelake]

But no forced induction is borrriinnnggggg 🥲

[@user-ip3vz4zt2h]

@@itsmikelakeyea true but I'm just telling that with some bigbore, stroker and a 4 valve you couldve doubled it's power

[@corbyweeto6061]

Wonder if that would happen if the timing chain skipped a few teeth

[@fhc1236]

Just put a turbo vrod motor in

[@Mzstihas-a-bwc]

your best bet is to skip getting a big bore and getting a 160cc ho motor they are alot stronger and more powerful

[@lewispeakall7277]

My thought on what caused it is the timing on the engine if you retard it a little by turning the stator plate (if the engine has a adjustable stator) and will stop what some call valve bounce

[@lewispeakall7277]

Not timing I was meant to put valve bounce being caused by the timing

[@ropoksu1242]

too loose valve spring to keep te rew limiter that high

[@11sjv]

1000cc superbike engine next?

[@markjovenalcagalpin7484]

try consulting or buying an engine from thailand. they make the best 125cc engines!

[@panos864gr7]

and also an oil cooler

[@mragamer4254]

You just need stiffer valve springs

[@carllaroncuadrado6266]

Try upgrading to 4 valve

[@Makki1]

Well 125cc engines are mostly cast iron, its not the most durable engine when it comes to high pressure and high heat.

[@jamesrobertson2056]

They don't like to back fire They bend valve

[@panos864gr7]

you definetely need stiff valve springs

[@enoletoissa4002]

Just buy 190cc Daytona Anima engine. It has stock about 20hp or something.

[@shanebeasley8191]

dig deep in the pockets and upgrade to a 212cc, not cheap though.... i wonder if you could reach out to company

[@Johnwick-bn7jl]

please send me the link for the turbo I'm still waiting

[@itsmikelake]

It’s in the description of every previous video homie!

[@ladydiana0413]

To much boost holding intake valve open . Need stiffer valve springs

[@itsmikelake]

That's definitely one theory, although we're only making 1.5 ish PSI of boost so not sure that would be it?

[@user-xe5fn3hs7o]

the timing chain is not perfect set thats why piston smash the head of walls

[@anthonytiamsim9886]

change the head for 4valve head

[@anthonytiamsim9886]

or make the head big valve

[@Altie8]

noiccccccccccccccccccccccceeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeee

[@itsmikelake]

NOICE!

[@user-so6im9iy5v]

sad it had to blow

[@MicahBell_1860]

What went wromg? You bought a chines engine to cut costs! Buy Japanese. Buy once, cry once! Personally I would have bought a 2nd-hand 125cc Honda XR or similar for $200. Added binus? No ECUs! Happy trails,Cowpoke

[@Paradoxical124]

You might have to clean your camera lens. It seems pretty hazy.

[@itsmikelake]

I think it’s time for a new camera 😅

[@road_to_pro_racing]

Buy a Lifan 172cc

[@Snoop.2024]

Second

[@Mr.De3D_music]

you over revved it

[@user-ey5wc6jk7r]

Toi litle engine