GY6 157FM engine timing chain keeps coming off By victor76 (Read 27,828 times)

[victor76]

Oh OK yeah I can adjust it but it automatically springs back out, that's what is spossed to so right? So if its all the way out but chain still coming off is it the chain guards then?

[victor76]

Ok so I took off the head and inspected the teeth on both the gear in the back and the cam up front. None of the teeth seem rounded or worn down. The chain guide seems to be bent down from the tensioner and where the tensioner contact the guide it has made a indent into it which is kinda off centered to one side. I tried my best to get the picture show the indent... and. I will put 1 or 2 more pictures in posts below so you can kinda see what I am.

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[victor76]

Teeth on cam

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[Alleyoop]

Well it is supposed to stay extended after you turn it CLockwise. So if it is NOT staying extended then it is not working and that is your problem. It is retracting back out on you and making the chain loose.
Alleyoop

[Alleyoop]

Notice on the VIDEO how he RETRACTED IT before putting the Tensioner in THEN turned it so it extended and it stayed there then he put the screw in.
Alleyoop

[victor76]

This is of the sprocket in the engine, I see it has 2 row a of teeth but ne is like half hidden. Is this spossed to be like this?

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[victor76]

Yes I saw that in the video, although mine won't stayretracted.

[Alleyoop]

The chain is OFF the GUIDE it should be on the GUIDE and nice and straight up to the CAM SPROCKET.
Alleyoop

[victor76]

It was on the guide.. I had moved it aside to take picture of the sprocket in the back there

[Alleyoop]

OH,HAHAHAHA, my bad.

Then I do not understand what your looking and asking a question about? Looks good to me.

Get a new Tensioner yours is shot it probably retracted and the chain came off or jumped some teeth.
Alleyoop

[victor76]

im trying to figure what is wrong then? The guy in the video you had posted mentioned something about as the engine is used the timing chain can "stretch" since this machine is was bought used from someone could it have been used to to point where the chain is so stretched it is still loose even with the tensioner fully extended?

[Alleyoop]

Well if the chain is stretched you won't find out until you put it back and put the tensioner back on and see if the chain is nice and tight. If you find it is still loose you just then get a new chain or since you need a Tensioner Order a chain at the same time and then you won't have to worry about it. But I would also order a new Guide so that way everything for the chain is new.
Alleyoop

[victor76]

Ok, looks like im going to order the whole thing, chain, chain guide, and tensioner. Since when i put the chain on this last time before it came off again it had alitttle slack. So once i get some money in ill order it and see what happens! If i get it and still have a problem should i just post in this thread again?

[Alleyoop]

Sure also post if everything worked out and the buggy is up and kicking arse DOWNHILL again. ;D
Alleyoop

[victor76]

Ok, will do. anychance you know how to get the chain guide off? seems ot be held in there with a pin or bolt. is it going to involve more then just taking off the head of the engine?