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Post by zoom on Apr 28, 2014 18:30:01 GMT -5
found a video saying that you can stuff rope into the spark hole untill there is enough that it blocks the cylinder from coming all the way up so that it blocks the variator. It sounds very useful, do you think it's safe? can the piston fastenings take that much pressure?
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Post by alleyoop on Apr 28, 2014 19:16:21 GMT -5
I would not put anything down in there but that is me.
Alleyoop
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Post by kevbailey on Apr 28, 2014 23:56:02 GMT -5
That doesn't sound like a good process to me.
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Post by zoom on Apr 29, 2014 0:39:47 GMT -5
i found alot of previous threads discussing it, it indeed carries some risk if you feed the rope in when it's on the exhast stroke rather than cthe compression stroke, there are alot of buff people discussing it on various forums if you search google: variator rope cylinder... here is the video: chinesescoots.forumwise.com/chinesescoots-ptopic10020.html |
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Post by PCBGY6 on Apr 29, 2014 1:13:13 GMT -5
Why not just get a impact and do it the right way? You can get them pretty cheap at harbor freight.
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Post by earlwb on Apr 29, 2014 11:03:27 GMT -5
The rope method works OK, but it has to be on the compression stroke to prevent bending a valve. Plus the rope needs to be clean or new if possible, and you need to keep a length of it outside so you can pull it out. Yeah I have seen people stick all of the rope they had inside and then wonder how do you get the rope out afterwards. With some engines there is a possibility it could bend the rod but usually this isn't a problem.
Normally one should use a variator tool. You can make the tool easily enough as well. It doesn't require more skills than what you can do with a drill and a hacksaw and maybe a file too.
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Post by wutzthedeal on Apr 30, 2014 13:32:37 GMT -5
I got a cheap 12v impact (hammer type; spins up on the inside and then "clank") one from Amazon, probably the same as PCBGY6 mentioned at Harbor Freight, something like $40. It has been worth its weight in gold for me... I use it anytime I have to take the rear tire or variator off and I can plug it right in to my 12V port that I installed to use it on the road if necessary.
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Post by toxictom on Apr 30, 2014 15:18:33 GMT -5
I learned this trick in small engine repair class in high school 40 years ago and have used this method on many types of small engines, lawn mowers, chainsaws, outboards, etc. over the years. I posted about it on a small engine forum and had a lot of replies saying what a terrible idea it was. The naysayers, some downright rude, slowed down when I provided a link to a workshop manual by Tecumseh or some other outfit saying to use a rope to block the piston. I used a nylon rope whenever I did it.
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Post by rockynv on May 1, 2014 11:28:05 GMT -5
With and iron piston and forged rod no problem however on too many scooters you could end up with problems later on. I have the variator locking too which is relatively cheap, takes less room and allows everything to be torqued up to spec afterwards with no guessing and less chance of doing any harm.
Lets face it you will be rolling the dice when you take a shortcut recomended for another type of engine such as a lawnmower, which spins a blade and is designed to take an occasional hard hit with a related sudden stop, on a scooter engine which is designed to have the load isolated by a belt drive, clutch and gearbox.
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