Valve Replacement on Lifan Pit Bike Motor - Part 1, Dissassembly

[@n1bpd]

Smoke usually means oil is leaking into the combustion chamber (or you put 2 stroke mix in the fuel tank) and loss of power may be due to low compression (did it start out of nowhere after otherwise running fine?). If both issues started the same time you might have loose bolts somewhere. Check the torque on your head bolts.

[@csw552]

I thought I was watching "how to set valve clearances", then you started taking bolts out of the cam sprocket. I was thinking "WHAT ARE YOU DOING?!" 😂

[@deegaw11]

So I just finished adjusting the valves on a 110cc engine and as I was putting the cover back on I over tightened it and heard a crack. A metal piece from the cover broke off and Idk where it went. Do I need to take the head off and remove it? Will it cause any damage if I left it in there?

[@connorwilson8078]

Hi Nate other day I was out and my tappet crew fell into cylinder, have since replaced but now when I rev sounds horrible , any ideas , near no power bike will move but

[@bigworm6635]

Why is there always one copper washer on that top head ? And usually one acorn but replaced with one regular nut on most of the mini pit bikes

[@n1bpd]

Copper washer and acorn is for an oil return along the same channel as the cylinder bolt - acorn nuts aren’t open at the end and so it seals against the copper washer so oil doesn’t leak.

[@swemx7403]

Thank god for no annoying music.

[@amen360]

if your valves are bad, does oil leak from the exhaust pipe attached to the engine? like in the video 1:58 from there. thanks for the help. can the valves be bought from a local bike shop.

[@DeadBeatRealism]

hey my bike recently hasnt been working very good. when im riding it wont build up the revs all the way and wont go top speed so its really laggy when riding. exhaust smoke and some oil starts coming out of the engine between the head and the cylinder when you give it throttle. I was just wondering if the valves in the cylinder head are supposed to be completely sealed cuz i took mine apart and it seems as if there not so i was just thinking maybe that could be my problem? your thoughts? thanks!

[@buckstarchaser]

All of this stuff looks pretty new and unworn. Was there an actual problem with the engine, and if so, what was it and what do you think caused the problem?

[@digitaltamer]

How did you get the cam gear off, the part where you used what looks like needle nose pliers. I have thebolts off, but the chain doesn't seem loose enough to get it off. ThaNKS.

[@n1bpd]

David Graham On the underside of the engine, there's a cam chain tensioner bolt. It's near the oil drain plug. If you unscrew that it will loosen the chain enough (watch out when removed, oil and several parts will come out). I tried to find the part of the video that shows it being removed - but I seem to have forgotten to film it, sorry about that.

[@digitaltamer]

Thanks for responding. I saw and tried it, to the point of accidentally taking it out entirely, the spring popped out. The chain was no looser. What ended up working for me was putting the cap nuts back on to tighten the head the back down. Thanks again.

[@abekones7085]

I have a SSR with 125cc in it, would you know the size of the valves? I have a bent valve and need to replace them.

[@kaiserindustries5567]

Where do i put the timing chain oil?

[@n1bpd]

If your leaking oil between cylinder and head then either your head gasket is shot or your head bolts are loose or both.

[@Diesel8290]

is there a specific torque for the bolts on the cylinder head?

[@n1bpd]

It's a Nikon D5100 with the 18-55mm included lens. I'm very happy with the Camera.

[@jackohara2434]

I need help I was checking my oil on my pit bike and the oil seal for the dip stick fell in and I can't get it out what will I do and what happens if I start it

[@janluesink4490]

there is standing 49cc on the engineblock ??? 4:20

[@n1bpd]

The Cylinder has a molded in marking of 125cm^3. There is small tag that says 49cc that is attached to the flywheel cover - which I added myself.

[@ryanread2335]

+n1bpd oh I know why you did that, because it's a moto-ped and if you are caught by police you don't want them to know its a 125cc?

[@n1bpd]

If a 4 stroke is smoking it means oil is getting into the combustion chamber - this could be from a bad gasket or seal, a bad piston ring etc. So a faulty valve seal could let oil into the combustion chamber - but it could be something as simple as the head bolts being a bit loose, so I'd probably check the torque on those first.

[@afkgang5076]

Y do mine have a paper gasket there but wen I try that one u have it don’t fit

[@tunturimies84]

If you still own this channel, what size thread is on that tool you used to remove the rocker arms? Thanks

[@jaefudgey1110]

9mm

[@tunturimies84]

@@jaefudgey1110 thanmk

[@HOTSHOT-ls1bc]

11:04 where did you get that tool

[@n1bpd]

I made it. You could make from from a wooden dowl and a file/hand drill. This is how I made this one, but wood will work. kzbin.info/www/bejne/pZ3GgJd4n5l2fac

[@HOTSHOT-ls1bc]

n1bpd thanks

[@MrAlton30]

hey i need some help. how would you no if you need a valve replace meant.

[@haydenrankin7394]

Can u make a video on how th change the gaskets

[@n1bpd]

I'd never heard of that brand before, appears to be different maker than the Lifan. If it's a close clone of the Honda Z50 engine you will probably have a similar process as in the video.

[@sureshp4273]

hi thanks for the video , is there a procedure during torquing the head bolts like criss cros patten

[@isaacmota8167]

Como puedo conseguir una maquina lifan??

[@dairazors27]

My lifan is very smoky ,and when I give it full throtle it loses power ! What's wrong ? What should I do ?

[@abbedidriss5189]

I have a Lifan 124cc(very similar to the on in the video). How do I get a vacuum fuel pump to work with this engine? Like where do I put the vacuum line?

[@n1bpd]

+abbed Idriss I might be wrong, but I don't think you can on the engine I have, there is no vacuum pump on it.

[@n1bpd]

It's 1P54FMI. Double check with your own measurements before buying valves. I ordered some before I took my head off, and they were too small.

[@brandonarrowsmith7825]

What would i seal my head gasket up with??

[@kaptein1247]

with a new gasket ofcourse

[@TiboSG]

Yo this saved mans day brada

[@cjwal614]

one of the head studs are loosening with the bolt what do I do?!?!?!

[@mannysanidad6164]

Hello sir what kind of tools did you use to pull the thing 10.2???? Thank u

[@n1bpd]

Manny Sanidad The dowels for the cam rocker are threaded inside, you just use a bolt threaded the same, screw it in and use that to pull out the dowel - I think its 8mm.

[@elimerr8199]

@@n1bpd hello how about spairparts of black hawck available or not

[@n1bpd]

Not that I could find, so I'm using the Honda Z50 service manual's value of 7 to 9 ft/lb. I didn't want to post that value in the video in case it was wrong as I found conflicting info in another shop manual.

[@bretrogers2076]

Where do you buy the piece that you are using to remove the spring retainers?

[@R_solver_]

I have a question the Pistom must be up or down

[@DanielGarcia-dd7vu]

up

[@brandonarrowsmith7825]

What size socket did you use at 5:30 mate

[@MrAlton30]

Ok 1 more. Would it cause a engine to smoke.?

[@MrLeviaFUN]

can anyone tell me how to diagnose bad /bent valves ? Getting almost no compression in my 110 cc chinese quad

[@Sean-tt9gx]

Levkin are your rings bad? are your plugs fouling

[@MrLeviaFUN]

that1motokid - Took the motor apart the other day. It looked like a rat chewed off the edges of the piston. Rings were junk, almost welded to the piston

[@ibleed1]

what camera and lens did you use to shoot this vid? Looks ace.

[@n1bpd]

I was re-tapping the spark lug hole for a timsert and got my timing marks mixed up... the valves weren't closed so the tap took a bite out of a valve. Completely my fault.

[@mikebrill2423]

how do u clean the top of the valves

[@mtbridingog9083]

Michael Brill wire wheel brush or put torch on them but don't warp the valves

[@n1bpd]

If you have oil being forced out of the actual valve cover then I'd check that your breather tube isn't plugged up and make sure you dont have too much oil in it.

[@jasonsimpson9746]

hi I've got a 110cc Chinese quad but its started to smoke really bad any ideas guys thank you

[@tp73717]

rings

[@svenkupere13]

Whats the thing you take out at 04; 00?

[@n1bpd]

It's a bolt that holds on the cam sprocket cover on the other side of the head.

[@n1bpd]

You shouldn't need to replace the valves. I messed mine up when when I was using a time-sert to fix a cross threaded spark plug - being lazy and not removing the head when I was using the time sert. The tap nicked the edge of a valve and I lost compression.

[@ztpatterztpatter1897]

yeeeyee I got the motoped lifan 125 tooo!! thanks for the instruction friend cheers from santa cruz

[@charlesbell1355]

What brand and model carb do you have on that thing?

[@n1bpd]

It's a Mikumi VM26-606, very happy with it.

[@n1bpd]

Isn't there a forum you can argue about this on?

[@n1bpd]

I'd want to get it out of there - but it will likely not make it past the small oil passages into anywhere to cause a problem. Tilt the bike to the side that the drain hole is on, Then put it level, hopefully this will get the seal somewhat close to the drain hole. Make something from wire that looks like a fish hook and insert that into the drain hole as the oil is draining out, hopefully the draining oil flow will move the seal nearer the hole and you can snag it with the hook you made....

[@mikkelnielsen9347]

I bought my Appollo Orion 29 a few weekes ago - with no luck i was screwed.. I am now trying to fix my valves but mine does not slide out like yours - 10:00 Thank you for the help!! :)

[@n1bpd]

Look on the casting and make sure there's nothing keeping them in, if not then find a bolt with threads the same size as the pins, screw it in and use that to pull them out. If your still having trouble then try some penetrating oil and let them sit for a while. Is there corrosion visible on them? That would make it difficult.

[@mikkelnielsen9347]

Thanks alot! I got it figured out just after my comment (A bit of muscle helped) Another problem that really gets on my nerves! - I do NOT have a compressorgun, and ive tried Oil, wd40 - still cant undo the bolts.. At 08:00 You have two simple bolts on each side to hold the cover on. My cover itself IS a bolt - So its a bolt cover thingymagik... My Orion is from 2002 so I guess thats why? Heres an example: www.google.dk/imgres?imgurl=tboltusa.com/store/images/100_0089.JPG&imgrefurl=tboltusa.com/store/pit-bike-engine-parts-engine-covers-engine-parts-c-51_514.html&h=480&w=640&tbnid=T24nytbWjuQxlM:&zoom=1&docid=FgbFCwtxX_mGhM&ei=tJnmVPf9FoL6PIaNgZAH&tbm=isch&ved=0CCIQMygDMAM Thank you SO much for your help! It is really nice to actually get a response, and useful information/help :) Thank you!!

[@n1bpd]

I made it myself (there's a link in the description to that video). You can buy them or make your own with a piece of aluminum tube and a dremel.

[@fahadmuhammad7470]

CarburTor name plzz

[@mattymccolgan9453]

Did your heart go in ya mouth when that cam chain. Sprocket started rolling back into the engine?

[@n1bpd]

That might be your "valve stem oil seals". You can see them in Part 2 of this video. If you have good compression your valves themselves might be fine and you just need the two small seals. However, to replace the seals, you need to remove the valves anyway so you may as well replace them too. I got a set of valves with oil seals from eBay by searching for "lifan 125cc valves" - Don't trust that the seller is right about the size, remove and measure your valve diameter before buying.

[@n1bpd]

Loss of compression if they just don't seal (as in my case) or the motor not running at all if they are bent enough (extreme over-rev from downshifting instead of up). Loss of compression or the engine not running doesnt mean its the valve... you could have a leak elsewhere or something else. You'll have to read up on troubleshooting.

[@MF-kb2nv]

I bent a 50cc valve once by getting up to speed then coasting and slapping it down in first gear. It was extremely bent. Hard lesson.

[@marabouu]

Is tgis bike pitpro125

[@daxje2008]

Wrong sequence, first remove the camshaft sprocket from the camshaft , then the side cylinder and head bolts and at last the 4 top head nuts....the opposite way of the assembly

[@Gordon9767]

Sorry, just reading that guys comments pissed me off. Well I just got a Bran new pit bike, put it together, seems to run fine. I have 2 identical. Showed up at the same time. One of them, when it warms up and I rev it, it smokes from the front of the exhaust, not out the tail. And it leaks oil, I can see it dripping from my exhaust bolt off the head, I tightened the 4 bolts at the very front of the head. Didn't want to over tighten. Doesn't seem to have made a difference. Bran spanken new bike. Never seen a honda do that new.....

[@MrKataters]

ooh god! ty man! my hero :D trying to change my sachs madass enginge but i have absolutly no knoledge and didn't knew what i had to do :D

[@GoProBermuda]

this is strangely relaxing

[@ztpatterztpatter1897]

is that a genuine mikuni and regardless is it a 24 or 26mm? and final question do you feel like it runs rich? and backfires on deceleration??

[@n1bpd]

I took the cover off and checked to make sure and they are 9mm.

[@jobos98]

hondas dont die/ you have to kill them, can u say that about a lifan ?

[@n1bpd]

I believe its called the "Piston Plate Comp.", I have no idea what it does.

[@mikkelnielsen9347]

Hello again and thanks alot for your help and replies!! Ive now reassembled Everything and tomorrow i hopefully Can start my Orion 29 - with the adjusted valves! I made a tool similar to yours just with Wood - it Works beutifully!

[@n1bpd]

No problem,did it start up ok?

[@n1bpd]

They are clones of a Honda design (with some internal and external changes). They are not made by, nor do they have the same quality as a Honda.

[@n1bpd]

It's a Motoped, cant post a link, but just add dot com to the end of that to get their site.

[@n1bpd]

I say this as someone who is more than happy with the Lifan (and its lasted several years) - BUT, Honda's are superior to them. I have taken several Chinese clone and a few Honda Z-50/ST-70 engines apart and there is a distinct difference in the quality of materials used, their processing, design choices and the level of finish. Even the difference in quality between the Chinese engines as pretty big.

[@thezoms9961]

This should be a ASMR kudos 👌

[@n1bpd]

Sealant for the petcock. It was leaking no matter what I use so I used a little too much of something I cannot remember (hasn't leaked since at least).

[@amen360]

thanks for the video, i needed this!

[@xclos313]

Very helpful thanx 4 da video

[@brandonarrowsmith7825]

Thanks mate nice one

[@jroberts2226]

Why stretch it out. I fast forwarded 3 times then I sacked it.

[@Steve_1970]

i can bet my life if this was an honda engine the valves would not need replacing

[@nemlu7]

Thank you for sharing.

[@deecee1490]

I am sorry I just thought I'd let you know that I clicked on a title that said it was going to be about tearing down a motor I didn't really want to watch you taking the plastic off. I know that seems kind of petty but really?

[@lol7360]

good job man

[@zahoorbaloch9512]

zahoor Baloch

[@1210MIKES]

Cool ; )

[@Steve_1970]

chinese manufacturers use cheap metals that dont last long, honda is far better quality thats a fact

[@declanreo6342]

The head off my 140cc pit bike is making a spluttering noise when I start smoke is also coming from spark plug any help thanks?

[@thezoms9961]

Declan Reo oil cooled?

[@zahoorbaloch9512]

zahoor Baloch