How To Set Cam Timing

This is how to set the cam timing for Honda's 50/70cc OHC horizontal engines.

[@bryanmicklewright8600]

Thank you im 13 and you hellped me fix my demon x125 as i can only do 2strokes till watched this how to set timing

[@aidanzollner5101]

tried this for like 2 hours then found this video and did it in 15 min thanks!

[@TheAlexManVideos]

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.

[@poeskharen]

Thanks man! I wasnt sure i timed it correctly, but now i do!

[@KTM-ye7xt]

Thank you this helped me alot

[@loganfouts1025]

Anybody else watching this 11 years later?

[@DexGains]

Jupp

[@KAOSshortyrip]

14

[@waveya1105]

15

[@teoflores289]

Great video would like to see a video on dismantling and rebuilding it

[@dannystratton7712]

Thank you Alex man! You helped me for sure, I was one tooth off.

[@sijen69]

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

[@noahlyden17]

thank you so much its hard to find anything on engine timing for atc 70;s

[@Broxty]

Easiest timing video on youtube, only thing I would suggest is adding a quick clip of checking you're tappets. Subd.

[@burgessoutdoors]

another great video! thanks bud!

[@digitaltamer]

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?

[@chrismoore-harris9012]

Very helpful video! Thanks a lot!!

[@TommyMx]

thanks just fixed my 06 crf70f

[@izaiahtyler3385]

Instablaster...

[@Camvba]

Lol

[@jlkoelker]

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?

[@brammichielsen6091]

I fixed my pitbike with this. thank you very much

[@timothychituck7559]

Nice, there are intelligent videos out there!

[@brandonlee1547]

Dude, thank you so much.

[@timschmidtgoessling8141]

Do you have any video of how to change the sprocket, cam chain guide on a xr70r. Similar motor to whats above.

[@dshine55]

Alex you are the BEST!!!!!!!!!! thanks

[@lotus4218]

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.

[@Sean.skipper]

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 ?

[@michelelavett2466]

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

[@2009justin1987]

Very well explained

[@chrisfixitup6175]

Ok I'll check those out thank you

[@jrssmallenginerepairandwel7197]

Thank you so much helped alot

[@BigBfromUC]

i have the ebay inner rotor kit. how do you reference Top dead center with the small rotor.

[@unkoistheking]

hey buddy, you have some great videos. but i need help with timing my 110cc 4 speed lifan engine. i need to know @ what position should the cam shaft be relative to the TDC marks?

[@adamgareau2658]

Do you know if they had the little plate on the Z50A because neither of the engines I looked at have one.

[@slroostergaming3415]

What is the valve position should be when setting the timing...in md 50

[@Mr10usdad]

Great video!

[@TheAlexManVideos]

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.

[@deeph46]

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?

[@curlyjr22]

Would that help on a knocking in getting on 3rd gear only. Z50 k3 thanks.

[@connorhall5597]

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

[@roofied8153]

Connor Hall make sure u have ur wiring harness wired up correctly

[@rexbrown8185]

how am i able to gauge lifters with so much clearence between cam and valves?

[@NCmtnDweller]

Would a 1970 Honda CL 70 require that plate also ? Mine is 6 volt but almost identical motor

[@6Camel6Finger6]

ill be doing a top end rebuild very soon (its already apart) are there any bolts that arnt 10 ft lbs?

[@morris9839]

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

[@jokerswildmusic4882]

What size chain is used for the timing?

[@MrStijnH]

Hi Alex, got a question. How do you remove the metal cirkel on the cilinderhead before you can even do this? And how do you put it back on again?

[@TheAlexManVideos]

@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.

[@CasondraEvans]

How do you know where to put the linkage on the right side of the motorcycle where the kickstarter is

[@1234567melbourne]

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?

[@connorsloat8661]

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

[@Goomer]

Good explanations

[@Sledluva213]

yo alex man great videos but im havin timing problems with my honda 185s atc would it be the same ?

[@TheIggy861]

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

[@alexcrafter_]

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?

[@listomoto]

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.

[@theomolokwu8920]

how do u take off that side cover thats covering the timeing thing?

[@peterholmes5307]

I have 110cc. There is a clicking in around clutch. What would it be?

[@garysmart1]

please reply. is top dead center the piston is at the higher part of the head straight.

[@rexbrown8185]

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.

[@TheAlexManVideos]

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.

[@dogdogg3336]

How would you close the cam if the head is off?

[@dogdogg3336]

I means the valves closed

[@NCmtnDweller]

Thank u Exactly what I needed to know

[@kidsalex13]

so when i do this on my baja the t is lined up but the dot is half a tooth off for the head end, what do i do about this?

[@hurairahhamka2077]

I need a little help here..i was thinking to reopen the head block of my Yamaha 135LC and i'm facing a problem which i cant figure out how to make the timing chain..i know about the marking at the sprocket but i dont know how to set the piston at 0-0 level..can you explain a little more..??because i've done this before but i've made mistake causing my valve to bend,,

[@ozgamer1624]

hi mate i have a honda 70cc r motorbike. i took the cover of and cleaned the inside and now everytime i ride the bike and i go to change gears they grind. also when starting it sound and it looks like it starts on the exhaust stroke can you help me

[@Checkmarkyourswag]

What are u talking about when u say the circles line up ? On the little sprocket with ye chain ?

[@rd2fst]

When I took the head off my z50 the cam was hard to get out. Im guessing I have screwed the timing up or it wasnt on tdc? What do I do now?

[@branman50314]

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

[@TheAlexManVideos]

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.

[@griggsb]

@TheAlexManVideos Great Videos.. How much slack should I have in cam chain on my atc70? If I rock flywheel (withoug moving cam) I have tons of slop. I posted a video today of it. Thanks for any help.

[@BROSKII-gu5yo]

Can you put a 125 pistons and rings and head onto a 140 engine thumptser

[@TheAlexManVideos]

What ended up being the problem? Once the long bolt near the spark plug is out the cover should come right off.

[@WizzRacing]

@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.

[@markloualfaro9690]

tnx.... for your video , How To Fix Cam Chain Tensioner XRM Honda?

[@Arendtservice]

What needs to be checked when the chain is off by a half link> is it in the cam, does it need to be replaced?

[@trailblazers2001]

what is the thickness of that pressre plate because I need to make 4 of them and want to get some sheet medal and make some

[@vielbianca]

si how about the camshaft stopper plate what is purpose of it and its use?

[@savageflux]

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

[@zenmotion8162]

hey i have a 100cc scooter and i want to reset my cam, can i set the cam your way? like this one

[@hiimjones1046]

Is this the same adjustment for honda 100cc??

[@randl3sx125]

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.

[@micksmotovlogs4030]

Hey, mate does it matter what cc. Thx

[@mrkmotocross]

do you/how do you adjest the valves on a tb 88 rh?

[@TheAlexManVideos]

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.

[@anthonybingham7333]

So I’m confused if the circle is on the opposite side at top dead center it’s fine?

[@Zieronn]

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?

[@feero9680]

i know your comment is 4 years ago but did you manage to find out the reason why?

[@EnjoySk8ter69]

does this work on any 4 stroke pit bike or dirt bike motor? i have a dr90 baja will this work?

[@muhammadyusufkhan6208]

Any idea why would a 200cc shineray roll on gear 1

[@rosjja]

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...

[@nightmareinaction629]

Ronak Macwan you cant really do nothing if you dont change it it will snap and causing your piston to slam the valves better spend 30 bucks over 400

[@nossey06]

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 ?

[@RustyCarnahan]

How similar are the 90cc's to the 50/70's?

[@Frederik19951995]

Do you have a video where you DISAMBLE cylinder and cylinderhead? Would be very helpful!

[@reeze4354]

how to advance the timig using the camgear arrow should i put it up or down?

[@porathydede7407]

Clarize Amorante

[@kw3640]

What is compression stroke?

[@ExlooerZandhappers]

i dont have a timing spot on my carter only the spots on the cam and my flywheel what can i do

[@Eli-tg5xz]

I can't even get my cam sprocket back on please if you have tips lmk

[@samueldavis9847]

thanks buddy i will try that on the timing if it works i,ll let you know sam.

[@michealwilson4606]

I'm unable to rotate came by hand. The only way it will turn is if the the cam sprocket is bolted in and I spin turn the crank..?

[@TheAlexManVideos]

Sounds like you are trying to rotate the cam while it's at or near TDC on the exhaust stroke. At this point in the rotation both lobes are opening the valves and this will make it difficult to rotate the cam by hand. Rotate the crank 1 full rotation which will rotate the cam a half revolution and chances are you will be able to remove the cam sprocket and rotate the cam by hand. If this doesn't solve it, check that your valve clearances aren't too tight. If that isn't the problem either, then something may be damaged such as a bearing or who knows what.

[@agbleerad5215]

Can u advice me.if it has the same tyming..my motor is yamaha mio scooter 110..but it is already upgraded 150 cc..58.5 bore it is a automatic same as a scooter..need ur help..tnx..

[@ONELIFELIVEITLAD]

Fantastic !

[@jipi3562]

Do this work on a 140cc lifan 2010 ?

[@dyllondunne4057]

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

[@jordanmckenzie4924]

Can I do this to my 125 pit bike assassin akuma mk 2

[@SunilSundar]

Hi, the screws that hold the sprocket to the camshaft on my 100cc honda seem to be scraping against the cam cover. why would this be?

[@bentonrodeheaver2596]

The heads worn enough to let the cam "walk" side to side. That happened to mine years ago (1971 model)

[@ColinBurnside]

Nice work there is a self tension adjuster for the cam chain. It needs to be slackened off and re tightened.

[@ColinBurnside]

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.

[@ColinBurnside]

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.

[@ColinBurnside]

No these engines can be tuned to the Gills but they don,t last to long then, i worked on them for years a good starting point but over engineered.

[@jakeb123211]

what happens if you dont leave a mark when you take the timing chain off the sprocket will the timing be off