There is a 10 mm head bolt directly opposite the center of the cover on the clutch side of the engine. It goes all the way through and hold the cover on.
well, right procedure is to actually see the cam shaft,s position , u need to confirm wether cam shaft is completely closed , or one is open and other is closed
@cobrachoppergirl To do this on a 4 stroke engine you do it exactly as shown. This would not ever apply to a 2 stroke. You don't break the chain. There is a cam chain tensioner somewhere. You loosen that as far as possible and then the chain will have enough slack to be lifted over the sprocket.
Great video. I am actually just trying to change a gasket, but I cannot figure out how to get the sprocket off. I have a similar engine and I have the 3 bolts out, but cannot figure out how to pull the sprocket off. You made it look so simple and I saw another video of a guy using needle nose, but I can't get it to budge. What am I doing wrong?
During installation, the cam lobes should be pointed towards the piston so the valves are completely closed. In this position, the cam sprocket should be installed with the circle pointing towards the notch in the head.
I'm having trouble with my second hand YX140 4-stroke engine. Because it's a second hand engine I've revised the carburetor and changed/renewed everything that was needed ( oil, gasoline, gaskets, rubbers, sparkplug, etc,... ). When I tried to start the engine for the first time, during summer, it fired up right away. But after the first start it's alwasy been hard to start the engine when cold, never when the engine was at operating temperature. Besides the starting problem there were no problems when I was driving around. Well, the engine didn't idle regularly but other than that no problems. When summer was over and it got colder it was even harder to get the engine running. The last time I went for a ride, during winter, again hard to start, no problems while driving when the engine was cold but the moment the engine warmed up, the rpm went up when idling and the engine stalled. I've set the valve clearance, changed the CDI and ignition coil but still it's very hard to start the engine.... The engine fired up two times, stalled right away and after that the kickstarter kicked back constantly so I gave up... What could it be?
It is not uncommon for the mark to be a half tooth off. If this is the case, it is better that the circle be below the notch in the head by half a tooth rather than above by half a tooth. This will only happen if you have a severely stretched chain, or are using thinner gaskets for more compression.
If the performance dropped after you tried to set the cam timing then I would assume you did it in correctly. The engine is designed to have the cam at a certain position relative to the crank, that position is only possible when the cam is correctly timed.
Timing adjustments can be made with the motor in the bike. Check the cam timing, if that is fine, try retarding the ignition timing a bit. If that doesn't work, your motor just has a lot of compression and that's a good thing.
crackbadger man 180 off will not cause any issues. This is a wasted spark engine so there is no such thing as 180 out. If the cam timing is set wrong then it's not 180 out, it's just wrong.
alex the bolts that hold the cam sprocket on are off set, they are that way so the cam lobes correspond correctly with the sprocket position. If the cam is 180 out it will fire at the wrong time. the intake valve only opens one time every OTHER revolution if the flywheel.
David Norris If you stop the video at one second. You will see a drain pipe coming form the bottom of the float bowl and running down the side of the barrel. To the left of this pipe as you look at it, you will see an hexagonal bolt going into the side of the barrel. Just under the cylinder head bolting position. That,s the cam chain tensioner.
David Norris There is a cam chain wheel here. Before removing the head and the cam shaft etc. You have to slacken off the bolt to allow the cam chain to slacken. Some engines not sure about this one. Have a built in self adjusting tensioner in the crank case which has a bolt on the underside of this side of the crankcase . Which you can slacken off as well. Its like a smaller drain sump bung.
It uses a different engine so the procedure is most likely different. You must find the timing marks and line them up. A factory service manual will help you.
I know they were originall installed on some models, if not all. I do not know what year they started putting them in or if they were there all along. The purpose of the plate is to decrease the area of the oil passage exiting the cam. This increases oil pressure in the cam and helps lubricate the cam lobes.
@jakeb123211 The sprocket has the mark on it. be sure you have it turned outside so you can see it. The chain has no mark to use. It can be used any where as long as the crank and cam sprocket are lined up. You can always check by looking at the valves for compression and exhaust is Top Dead Center or TDC.
Great video but I have a question. Where on earth did you get that small of a torque wrench or is that just an adapter? Either way, I need one for doing the same project.
Hi Alex great video, I have just replaced my head gasket and had the valves reseated, I have put everything back together, but it won't start, it feels like there is no compression...I put it at TDC, then the cam sprocket is out, so I took the chain off and corrected it so both are lining up, and it just won't start. If I move the alternator nut should the camshaft sprocket move, because it doesn't, could the chain have slipped? Also when it is at TDC and the camshaft is in line with true mark should there be play in the sprocket even when the tensioner is on...I know this is something simple to fix, but...Yamaha xt125x
How do you set your piston in time with the cam I have the T mark and the sprocket mark lined up where there supposed to be but the piston is hitting the valves ?
Thx for the video, it really helps me out. Q: If all timing marks have alligned and the camshaft only have two sprocket bolt holes. Do the bolts can be anywhere between the two holes? Vise versa?
Hey I have a 07 crf50 I have spark timing is set vavles were they need and the carb is clean won't even start on starter fluid could u help me out I'm stumped
Haven't rebuilt one in awhile, I've had mine all taken apart, but now I'm having issues with my sprocket going back with the chain on, it's as if the chain is too tight or something, but the sprocket won't go back with the chain on, yet the chain hasn't changed at all, any reason for this?
@cobrachoppergirl it is normally not as easy as just lifting the chain off the sprocket once the tentioner is actually out you can just pull the sprocket off of the cam depending on your bike and therefore the chain comes off, just dont drop anything in the motor or your srewed.
The marks on the crank must line up at the same time the marks on the cam line up. The crankshaft or flywheel should have a mark that indicates TDC. I have never worked on your model of motorcyle so this is the only information I can give.
Cam timing will be set at the factory. The valve clearance should be set but since it's a Chinese engine you never know. I'd check everything before I started it.
It's not likely that it moved when the tensioner came out, unless your rotated or started the motor. Either way, it's very easy to check the cam timing. Pop off the ignition cover and the cam sprocket cover and make sure the marks all line up. Chances are you're safe, but you should check to be sure.
great video. very easy to understand and follow. thanks. don't have one for valve lash adjustment, do ya? my step-son's 97 xr 70r is consistantly flooding after coming off full throttle and have dinked with the carb numerous times and replaced nearly every "wearablel item" in the thing. Was acting similar when we 1st got it 6mos ago + low on compression. I adjusted them then @.003int and .005exh. Bumped up the compression and seemed to help alot with the flooding. exh was real loose then
It slows flow of oil out the end of the camshaft, increases oil pressure inside the camshaft, and pushes more oil out the oiling holes on the lobes of the camshaft.
I haven't seen one yet with that plate on the cam, also you should of explained to remove the cam chain tensioner before trying to time it. Also the cam needs to face the piston
this is a bit hard on my pit bike, it runs with its current timing, but i think it might be off, and i want it running like factory, only problem is the the last owner damaged the casing where the mark usually is, so i have no idea what mark is the timing one. Is there any other way i can find out?
good video, i just but a new cylinder head on my 110cc dirt bike and the carb has a lot of suction and if the air filters on it will shut off and if it runs for like an hour oil will drip out some were could you tell me why its doing that it didn't do it with the old cylinder head. if you could try and help me out with this that would be great. Thank you
i have a 2004 terminator. If i set my cam with the timing by fan how come my rocker arms are flapping? im instructed to line the two holes in line with case and larger hole out in middle of cam.
If you really think about it, it dang well better fire everytime that censor see's the trigger and that's every 360 Degree rotation. It does have a wasted spark, interesting and thanks.
For those people trying this, don't. More accurate way is to remove both inlet and outlet valve covers, remove spark plug and turn cam till both cam nodes are on the rock and piston is at top of cylinder, once achieved chain and cam marks can be lined up. his could be 180 degree's out and without checking cam node positions and piston position to verify you could do damage
TheAlexManVideos Hi Alex,,here Kristof from Belgium. i got a problem with my minitrail, Always when i screw loose the under tappetcap, it is fully fild with engine oil (the tappetcap). I think this is not normal to have so much oil on that place, What is your opinion about this? with friendly regards
i have a 140 stomp pit bike and if it ant timed up right would it course it to run bad like it ticks over fine but when you rev it it bogs and engine gets hot very quick like with in a min or two but when u put the t for time at the mark its ment to be at it hits the valve so iv had to put the timing in a spot that i think its in iv even took off the head to see if the piston is at the very top and it starts fine but dont run fine and its on the exhust stroke any help please on how to solve this
wonder if you can help me, got a pitbike, my mate crashed in the top end of it causing it to cut out and loose compression and knocked it of timing, bought a new head as it's cheap enough, but it would time it's either one tooth above the knotch or one below, what should I check, thanks
Thanks! I got an engine with the marking 180 degrees from the notch. trying to trouble shoot why there is hardly any room for clearance adjustment on the tappets. they are slightly pushed down at tdc and if I set it to clearance at that point, they go up further at firing position and tap tap tap. could I be off a tooth?
I Replaced my head gasket and i dunno if i set the timing properly but when i kick it , it wont start and has no compression and sound like the timing chain is rattling
I do not own or work on knock off engines, so I will not guarantee anything I say to apply to your engine. If the crank markings line up at the same time the cam markings line up, the cam is timed correctly.
So there sprocket can only bolt on one way??? Or it doesn't matter what holes on sprocket go-to what holes on cam?? Cause I don't see marks on cam? Just bolt sprocket any way and set marks??
Some engines the cam sprocket can only go on one way, there is no way to install the sprocket backwards or anything other than correct. Other engines just have two bolt holes 180 degrees apart. So you can install the cam 180 degrees from correct or even backwards so the marks are not visible. Now, I've never seen a cam sprocket without any timing marks, but there's no saying what the Chinese knock-off engines are doing. I never work on those, and all my experience and advice is in regards to genuine Honda engines. Now here's where it gets confusing and people argue with me. There is no such thing as timing the engine "180 off". The engine uses a wasted spark ignition, so it sparks every time the piston comes up. This means if you install the cam sprocket 180 degrees off from where it's supposed to be on the cam, it will run exactly the same. So while functional and you could make this mistake with no consequences, I would say this is sloppy and shows you don't know how to properly assemble the engine. The only issue arises if you don't line up the timing marks on the cam with the head at the same time the flywheel is lined up at TDC.
pls help. how can i remove the circle covering that cam gear? pls help how can i return the bolt that you can see in the video. because i cant put it back.
heyy my timing was off by like one tooth so i tryed changing it but i dont know what i done but now my pitty sounds like a lawnmower and wont go when i put it in gear. i turned the cam abit when the sprocket was off does this matter ?
Hello sir ..I got a question for you...I have splendor pro..well ridden 30,000 km...but somehow it is making some weird noises from the engine...the mechanic says that need to change the timing chain...can we tighten up the spring on which the timing chain relies ...what can we do instead of changing the chain ?? Answer please...
i have a z50r and i just took the top bit off as well as the head surrounding the piston. i then span the magneto around a few times. i am now trying to get it back to normal. how do i know on which stroke is the magneto going to make the spark plug fire as it only does it every second tdc? i can get the timing marks marked up properly but im not sure about the spark?
I have a 110 cc I have new starter on it I have new carburetor on it new head on it getting plenty of fire but still will not start what am I doing wrong please help
hey man i have a 110cc pit bike....so if your cam timing is off even if by one tooth could it cause backfiring through the carb an loss of revs?.... im having this prob it will idel great but i cant rev the motor without killing it and shooting fire bac through the carb
TheAlexManVideos I just had my timing chain break on my 1969 Honda Z50, initail visual inspection leads me to believe that the worn timing chain (engine was at wide open throttle), skipped a link, and that stretch snapped the chain... do you have a video on how to install a new timing chain? I really want to get it going again as cheaply as possible (labor wise).
They most certainly do have tensioners. Depending on the year it's an automatic tensioner or a manual tensioner. No need to mess with an automatic tensioner. The manual one is adjusted with the set screw and locknut just forward of the shift shaft and below the flywheel in conjunction with the adjustment screw located on the bottom of the engine.
alex help me please iv got a 125 xsport engine im rebuilding at the min. but befor i stripped it. the clutch was only bitein right on the end. like when u pull the clutch the bit on the end of the clutch cable was hitting the bit on the engine why is it doing this? i cant work it out is thay any thing i can do? cheers brett.
my head gasket had blew on my 125cc pit bike so I put a new one on and when I took the casing off the flywheel my pick up was snapped so I replaced the stator and now I don't get a spark any ideas to what it could be I've put a new ignition coil and cdi on it as well
There is a tiny "circle" (a small dot), on the 3 holed sprocket. You can barely see it anywhere in the video...maybe at 3:17 at the tip of his fingernail. That circle needs to line up with the small nick in the case at 9:00 position. Easier to see when you look at your sprocket.
I have a 220 bayou i got it running only by pull start check the starter it was good i took the stater off put it all back together it crank over good with the electric start but now i don,t get no spark what could have i done wrong please help
If it worked before and now it doesn't then you forgot to put something together, or you put something together wrong. Check your electrical connections.
