My hardware store had 10in x 10in rubber sheeting in the plumbing section that is easy to cut down for blocking ports. I also found that buying 1/4" Aluminum strap that is 1-1.5" wide works really well. It's easy to cut to length and drill a couple hole in for blocking ports. as far as saws without impulse barbs you have a couple options. Knock out a spark plug core and use it or buy a piston stop with a barb on the end of it. I can't even find a piston stop/lock like mine and can't remember where the heck I got it... its been too long...

You can drill down the center of any standard piston lock and then cross drill through the tongue and install your own barb on the top side. Keep in mind you will need a o-ring to hold pressure.


I will point out that I do not like using these piston stops for a good reason... You'll eventually pop a hole in a piston or strip the spark plug threads. I'm only showing so that people can get an idea of how to drill the center and the tongue to the left to make a channel to inside the cylinder.

nobody that I know of makes a comprehensive pressure/vac testing kit for saws. Most get a Mity Vac and make pieces as needed. I'm sure stihl or husqvarna does but they will be brand specific and only work on so many models outside the brand they were designed for.My hardware store had 10in x 10in rubber sheeting in the plumbing section that is easy to cut down for blocking ports. I also found that buying 1/4" Aluminum strap that is 1-1.5" wide works really well. It's easy to cut to length and drill a couple hole in for blocking ports. as far as saws without impulse barbs you have a couple options. Knock out a spark plug core and use it or buy a piston stop with a barb on the end of it. I can't even find a piston stop/lock like mine and can't remember where the heck I got it... its been too long...You can drill down the center of any standard piston lock and then cross drill through the tongue and install your own barb on the top side. Keep in mind you will need a o-ring to hold pressure.I will point out that I do not like using these piston stops for a good reason... You'll eventually pop a hole in a piston or strip the spark plug threads. I'm only showing so that people can get an idea of how to drill the center and the tongue to the left to make a channel to inside the cylinder.

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