piston stop (what to use?)

[wicklamulla]

well i usually use the black plastic one that was supplied with my MS200T, I also use it on my Husky ground saws. But i bought another type yesterday which is made from natural coloured nylon which screws in place instead of a spark plug and keeps the piston from moving. What say ye, are these ok to use or can they damage the piston or bore ? kindest regards, KEN:thumbup1:

[mad matty]

I personally use pull cord and have done for more than 10 years

cheers Matty

[Rupe]

Of course they are ok, thats what they are for. Yuu can even get metal ones, a slight scratch on the top of the piston wont hurt anyway, my 066 has a big dent in the top of the piston where we really struggled to get the clutch off recently, its fine though.

 

An impact gun works well too, sometimes no need for a stopper!

[TGB]

Pull cord here too.

[Dan Forsh]

Manufacturer's if I have one to hand (i.e. cheap black Stihl), pull cord if I haven't.

 

I have one of those ally, screw in the plug hole, type too, but I would only use it in a cylinder where the plug hole is in line with the cylinder bore, not angled to it.

[Rich2484]

Pull cord hear aswell.

 

Main thing with pull cord is to not get it stuck in the exhaust port. That's about it.

 

Never really like piston stops to be honest, heard too much about them breaking and taking forever to get out the cylinder.

 

I have never liked the metal ones either. They do damage the top of the piston. And when metal is dented it has to push it somewhere. If that makes sense. Make a dent in metal plate and you end up with a rise in the bottom. So dent a piston and it has to push the ally somewhere. Plus it only takes a small bit of broken metal to cause serious damage.

[agg221]

Cord here too, but don't use anything frayed, as I found out to my cost. The frayed bit happened to end up near the edge and jammed between piston and bore - fortunately it was a big, heavy cast iron lump (Villiers engine on a Teles) and due force was applied, but it could have been terminal on a modern saw.

 

Alec

[spudulike]

Listen to Rich and Alec, I have had a couple of saws with fractured piston crowns when someone has used a screw in type on an engine with a plug hole that isn't at the very top of the combustion chamber.

 

The Stihl one us generally very good and rope with saws with clutches on very tightly but make sure the piston is covering the exhaust port when you insert it otherwise you may get issues:thumbdown:

 

A typical pneumatic impact gun on a screw in metal stop is brutal IMO and a good way to fracture the piston crown - you aren't working on a lorry

[wicklamulla]

Listen to Rich and Alec, I have had a couple of saws with fractured piston crowns when someone has used a screw in type on an engine with a plug hole that isn't at the very top of the combustion chamber.

 

The Stihl one us generally very good and rope with saws with clutches on very tightly but make sure the piston is covering the exhaust port when you insert it otherwise you may get issues:thumbdown:

 

A typical pneumatic impact gun on a screw in metal stop is brutal IMO and a good way to fracture the piston crown - you aren't working on a lorry

 

 

 

tanks everyone. Spud i tink he means to use the impact gun on the clutch to spin it off and not the piston stop (i hope) !

[Stubby]

Don't use on if I can get away with it . Make sure de comp valve is out if you have one . Sharp clout with a copper or aluminum drift and 3/4lb hammer and it spins off . ( Clutch that is )