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piston stop (what to use?)


wicklamulla
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I use a 10mm round polythene stick about 150mm long. I use them for repairing skis. Just pop it in the plug hole and it can't damage anything. Not for hot saws though!

 

It sounds like a glue stick for a hot glue gun, one of those would work I suppose and they flex quite a bit so you could bend them into place. I'll try that next time instead of cord.

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This is going to sound idiotic. Could someone explain using the cord please. Do you just pull the starter corder out and stick a loop down the plug hole and below the piston?

 

:lol::lol::lol:

 

Sorry.

 

No, you get a length of cord from a reel. Or an old pull cord assembly and remove the cord.

 

Then you need to wind the piston up on the flywheel or pull cord on the saw. I find a screwdriver carefully in the plug hole to show me where the piston is helps. When it at it's nearest high point or just before tdc I take the cord and shove as much of it into the plug hole as I can, it then fills the gap between the piston and the top of the cylinder.

 

Then either turn the clutch or flywheel depending on what one you want off and the piston will push against the cord. Squashing it and stopping the piston.

 

Now remember the clutch is opposite thread so the piston will move the wrong way. This is important to get right, read below.

 

 

The most important thing to remember is DO NOT insert any cord until the piston is up past the exhaust port. This could jam the cord between the piston and cupylinder wall causing damage to the rings.

 

Remember the threads to undo the clutch are left to tighten and right to loosen, this means if you wind the clutch to the left and insert the cord you will then have to rotate the clutch back the other way, dropping the piston and if cord is still in there a high chance the cord will drop into the exhaust port and when piston returns to top it will trap the cord. Causing damage.

 

Hope that all helps.

 

P.s double the cord rather than just shoving one end in. By doubling it up there is less chance of getting the end of it trapped between piston and wall also.

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I just wizz em off with impact gun without a piston stop

Though I do have the special tool that fits in the clutch.

If out on site and needed in have used Prussics rope rather than starter cord to prevent getting a bit trapped.

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