I have a RFZ z40 max 140cc engine and is leaking oil out the exhaust. I’m having a hard time finding the right piston to order to replace it. I believe it’s the piston rings that need replacing! 🙏 opinions are welcomed!
Hey know this is a wild stab in the dark but I have a 140 engine just done a top end rebuild it came with oil cooler but new top end doesn’t come with holes for it. Should it be fine to run like it is? Many thanks
Hey any way to get in contact to send you a photo of my piston/rings/barrel. I cannot tell if I need to rebuild it as it all looks fine but the bike will not start. I have been through everything else at this point as I have 2 140s so been part swapping to test for most things. Thankyou
Anyone help me my friends bike fires up ticks over etc but when he sets off in 1st he has to change to second as its screaming for a gear change and seems like. Its starting to do it in second all others seem fine tho and rides smooth
Hey Moto28 i have a question. Does this cylinder work on a 125cc to 140cc top end conversion? ill be soon be putting a bigger bore and piston on my pit bike i have a 154fmi engine code.
Is it necessary to take the cam chain tensionner off ? I guess not but i prefer to ask since it will be a first time to me. Also do you leave the engine at tdc before taking it apart? Or it does not matter since you have to time it again after ?
Hi there, the cam chain tensioner needs to be undone and removed for the barrel to slide off. Or the chain will end up stuck on the tensioner. And to add to this there is no need to get to tdc, when you reverse the process you will line up the mark on the magneto to the casing and Mark on the cam gear again to the casing.
Tbf as a machanic I always use gasket seal as well as fresh gaskets some don't agree others swear by it all depends who has had the engine apart before you get to it
My bike is really struggling to start. Does any one have any suggestions on what to do after checking compression, spark plug, fuel and the rest if the basics?
If there is fuel getting in, carb cleaned with compression it could be the engine timing out. It may have a spark with the timing slightly out but wont run.
Moto 28 that would be great if you don’t mind, but don’t rush or feel you have to I’m not in too much of a hurry i can only fix it when i have the time anyway
Remembering where the parts go comes with experience of taking so many apart. If you are taking one apart for the first time I would advise keeping all of the parts with the item removed and laid out.
Great video! Straight to the point. Thanks
I have a RFZ z40 max 140cc engine and is leaking oil out the exhaust. I’m having a hard time finding the right piston to order to replace it. I believe it’s the piston rings that need replacing! 🙏 opinions are welcomed!
Thank you
Hey know this is a wild stab in the dark but I have a 140 engine just done a top end rebuild it came with oil cooler but new top end doesn’t come with holes for it. Should it be fine to run like it is? Many thanks
no part 2 tho???
Hey any way to get in contact to send you a photo of my piston/rings/barrel. I cannot tell if I need to rebuild it as it all looks fine but the bike will not start. I have been through everything else at this point as I have 2 140s so been part swapping to test for most things. Thankyou
Good video sir
I have too, but just cylinder head complete
Anyone help me my friends bike fires up ticks over etc but when he sets off in 1st he has to change to second as its screaming for a gear change and seems like. Its starting to do it in second all others seem fine tho and rides smooth
I have a 160cc pit bike, bought it new in 2017 and have never rebuilt it, has 350 hours on it
No way man 350 hours, how does she pull.
125 Lifan engines can do up to 20,000 miles without a rebuild if treated right. That’s like 2000 hours.
@@Mad.Croatian it's insane to think a small engine can keep going for that long, also shows the importance of regular maintenance
Moto 28 I haven’t noticed a loss in power and abuse the shit out of it, same for my 110cc pit bike which I’ve also never rebuilt.
@@MxMax-iu9dt it's crazy how good these little engines are, I am about to do a top end on another yx140
Will u do the rebuild??
Hey Moto28 i have a question. Does this cylinder work on a 125cc to 140cc top end conversion?
ill be soon be putting a bigger bore and piston on my pit bike i have a 154fmi engine code.
No
@@gadji0526 why?
@@benzinz_4821 the piston stroke of the 140cc is greater than that of the 125cc
I replaced my piston rings and oil rings and gaskets and my 110cc is still smoking and bogging any help?
Oil level is good
did you put the oil passage o ring on? your kit should have came with one
Might be your valve seals leaking
@@yaboi6006 thanks that was the problem.
@@andrisak4795 nice glad you got it sorted. Usually the rubbers on them degrade over time.
Is it necessary to take the cam chain tensionner off ? I guess not but i prefer to ask since it will be a first time to me. Also do you leave the engine at tdc before taking it apart? Or it does not matter since you have to time it again after ?
Hi there, the cam chain tensioner needs to be undone and removed for the barrel to slide off. Or the chain will end up stuck on the tensioner. And to add to this there is no need to get to tdc, when you reverse the process you will line up the mark on the magneto to the casing and Mark on the cam gear again to the casing.
@@Moto-li9or Thanks for the quick answer.
PART 2 NEVER CAME ....
Good vidoe
I need this engine
iss engine ki price kia hy
No Part 2 ???
I got carried away and fitted back to the bike.
filtro centrifugo de aceite de motor 140 dónde lo consigo una página o el link
I need a oil cooler for my pit bike
Does anyone know the name of the engine covers with the b on it ?
Tb or trail bikes I believe
Jayclem84 thansk
My top end don’t fall apart it’s like sealed with a gasket
Was this when removing the head or the barrel buddy.
Tbf as a machanic I always use gasket seal as well as fresh gaskets some don't agree others swear by it all depends who has had the engine apart before you get to it
it doesn't use a flywheel
My bike is really struggling to start. Does any one have any suggestions on what to do after checking compression, spark plug, fuel and the rest if the basics?
If there is fuel getting in, carb cleaned with compression it could be the engine timing out. It may have a spark with the timing slightly out but wont run.
I’ll have a look at that then when i get chance, cheers
@@Jack-ns5zc no drama, I will put together a video of timing the bike up of you need a hand bud.
Moto 28 that would be great if you don’t mind, but don’t rush or feel you have to I’m not in too much of a hurry i can only fix it when i have the time anyway
I know this is a old comment but valve tappets being adjusted incorrectly can make it not start, extremely hard to start
Hi bro how by this engine
where and how do you remember the parts
Remembering where the parts go comes with experience of taking so many apart. If you are taking one apart for the first time I would advise keeping all of the parts with the item removed and laid out.
Were ur valves bent?
no all valves looked and sat fine in the head.
Just chuck it on limit
#fullsend
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