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Post by alleyoop on Jun 17, 2013 23:36:49 GMT -5
Found a couple ways to change the timing chain without having to take the crank out. This VIDEO shows how to replace a bad Cam Chain and connecting the new one to the old one and pulling it through with just the valve cover off and cam off. But to connect the new one takes a little welding job. This one is great if you have a 250, it appears the chain will fit around the crank behind the Variator. I was googleing to help a guy out with a bad chain and a stuck chain at that and I got a hit on a fellow that was nice enough to take pictures of how to do it without splitting the case. That is provided there is enough room around the crank to fit the chain through on some it may not be possible but why not see if the chain will fit, if so you saved yourself a lot of work. You will need a new OIL Seal and Head Gasket. Alleyoop This is on a roketa 250b scooter: First thing is make yourself a HOOK out of a piece of wire or something to hook the chain to bring it up to the head.        |
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Post by devo344a on Jun 18, 2013 8:10:13 GMT -5
Wish I had seen this before. Thanks for the post Alleyoop
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Post by urbanmadness on Jun 18, 2013 12:02:30 GMT -5
wow! Cool trick!
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Post by jerseyboy on Jul 5, 2013 20:23:54 GMT -5
Sweet,,good to know!!
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Post by triker on Jul 5, 2013 20:39:27 GMT -5
Neat trick, but caution you might scratch the bore in the case where the oil seal seats with the chain and the seal may leak around the outside. If you do scratch it a little high temp silicon will help seal it so it don't leak oil.
Roy
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Post by robrun on Aug 11, 2013 22:11:19 GMT -5
now THAT is cool
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Post by rockynv on Aug 14, 2013 4:06:05 GMT -5
And I just break the old chain at the joining link (if it is not already broken), tie it to the old chain which I break at the joining link and using the old chain to just pull the new one through re-joining the ends when I am done. All done just by removing just the valve cover, rockers and cam shaft.
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Post by triker on Aug 14, 2013 12:41:29 GMT -5
And I just break the old chain at the joining link (if it is not already broken), tie it to the old chain which I break at the joining link and using the old chain to just pull the new one through re-joining the ends when I am done. All done just by removing just the valve cover, rockers and cam shaft. A couple of questions. I know how to break chains apart and have several size chain breakers. Do you use a new link and peen the pins when you re- connect the chain or do you reuse the link you broke, if so what tool do you use to re-peen the pins? Roy |
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Post by alleyoop on Aug 14, 2013 16:07:06 GMT -5
If you ever check out a CAM chain for the scoots there is NO JOINING LINK that you can take off like a Chain on a bike. But The first VIDEO I put up shows how to replace a bad Cam Chain and connecting the new one to the old one and pulling it through with just the valve cover off and cam off. But to connect the new one takes a little welding job.
Alleyoop
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Post by triker on Aug 15, 2013 1:13:30 GMT -5
I have looked at many cam chains. Every one I have has a different colored link, that is the connecting link. It is possible to put a cam chain back together with out using a welder, you just need the right tool. I use a swelling tool at work to make continuous chain without a master link that uses a clip. The tool I use is called a swelling tool. It swells or peens the pins just like at the factory. The one I have works on chain sizes #25-#60. Here is a photo of the cam chain on my workbench. It is possible to replace this link with the proper tools.  Roy |
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Post by rockynv on Aug 16, 2013 15:23:54 GMT -5
I have looked at many cam chains. Every one I have has a different colored link, that is the connecting link. It is possible to put a cam chain back together with out using a welder, you just need the right tool. I use a swelling tool at work to make continuous chain without a master link that uses a clip. The tool I use is called a swelling tool. It swells or peens the pins just like at the factory. The one I have works on chain sizes #25-#60. Here is a photo of the cam chain on my workbench. It is possible to replace this link with the proper tools. Roy You got it. I beg borrow when I need to do it as I don't own the tool but that is how its done. If I did bike repair for a living I would get my own swelling tool. |
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Post by alleyoop on Aug 16, 2013 16:32:39 GMT -5
I must be missing something and I have been around quite awhile and have fixed many chains probably more than most but a "SWELLING TOOL"? Can someone put a picture of this tool. I know there are many types of chain breakers, installers, peeners and spreaders but I have never heard of a tool called a "SWELLING TOOL". The only one I know of is what boxers use to get their swells down by pressing a cold piece of hand held metal which they do call swelling tool.
Alleyoop
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Post by sailracer on Aug 16, 2013 17:32:14 GMT -5
[replyingto=alleyoop]alleyoop[/replyingto]I've heard of a chain rivet spinning tool chainsaw shops have them
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Post by alleyoop on Aug 16, 2013 17:34:11 GMT -5
Yea, but they are saying "SWELLING TOOL"  Alleyoop |
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Post by sailracer on Aug 16, 2013 17:40:05 GMT -5
[replyingto=alleyoop]alleyoop[/replyingto]probably the same thing. Remember when a pipe wrench was a stilson,and an adjustable is still sometimes called a crescent wrench |
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..BAD TO THE BONE..
jet