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 Post subject: Dumb question
PostPosted: Mon Nov 13, 2017 4:01 pm 
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Joined: Fri Jan 03, 2014 10:24 am
Posts: 359
Location: Columbiana, Ohio
I posted about my pilot possibly having a lean condition caused by an air leak the other day so I have the exhaust and carb off getting ready to do a leak down test. Is there a link somewhere on the site of exactly how to do that. Also is there a difference between a vacuum test and a leak down test?


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 Post subject: Re: Dumb question
PostPosted: Mon Nov 13, 2017 4:21 pm 
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Joined: Fri Mar 18, 2016 6:33 pm
Posts: 945
Location: Rhode Island
Here is a good article that was shared with me.

http://www.klemmvintage.com/airleaks.htm

It is my understanding that you should do both tests because sometimes a seal will only leak in one direction. There is no step by step instructions that I’m aware of. Block off the intake and exhaust port and then there are different methods on how to add the pressure/suction. Spark plug, directly in the exhaust port, or from the intake port. To use the exhaust or intake you need to make something custom. You can buy the piece that screws into the spark plug and has a nipple at the end for a hose

CO has some really good pics of his setup and can provide more info I’m sure.


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 Post subject: Re: Dumb question
PostPosted: Mon Nov 13, 2017 4:23 pm 
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Joined: Tue Jan 17, 2012 3:19 am
Posts: 7698
Location: Hope, B.C Canada
PilotJunkie_87 wrote:
I posted about my pilot possibly having a lean condition caused by an air leak the other day so I have the exhaust and carb off getting ready to do a leak down test. Is there a link somewhere on the site of exactly how to do that. Also is there a difference between a vacuum test and a leak down test?


There are no dumb questions. Everyone here to help.
Below pdf of that unit.
Don't know if a post was ever made EXACTLY how to do it but it is straight foreword.
The leak down test is a combination of a pressure test and then a separate vacuum test. I bet there is only two or three guys here who ever do the vacuum test. Most only do the pressure test and call it a day. You do not have to do the vacuum test. I do it to confirm the double lip seal on the crank is good. That seal has to seal both ways because of the design of these engines. The way I do my vacuum test is I use the same rig as the pressure test. I just hook up a suction gun and check valve to the port where you would normally put pressure in. If I find a link to mine I will post.


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2 stroke pressure testing.pdf [314.03 KiB]
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 Post subject: Re: Dumb question
PostPosted: Mon Nov 13, 2017 4:36 pm 
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Joined: Tue Jan 17, 2012 3:19 am
Posts: 7698
Location: Hope, B.C Canada
Here is a pic of my vacuum rig.
You will notice it is just a standard suction gun you can buy at an auto store. It is used to add or remove oil from a rear end on a car or truck.
In the pic you can see the gun then some hose with a check valve in the line.
It is hooked to the same port that you use to put pressure into Engine. You MUST remove the tire valve in that pressure port.
That port is just a standard tire valve that is threaded into that plate. Any tire shop should have them. It's not a regular rubber one it is brass with a nut to tighten it down. Zoom in on the pic and you should be able to see it.
The check valve in that line is one that we had a work. You should be able to get one at a machine shop or possible at an auto store. Any check valve you can find will work. I am thinking a check valve like the ones in those one man brake bleeder kits. Those are a bit small in size but I see no reason why a guy could not put together a bunch of fittings to splice it into a line.


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 Post subject: Re: Dumb question
PostPosted: Tue Nov 14, 2017 10:09 pm 
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Joined: Tue Jan 17, 2012 3:19 am
Posts: 7698
Location: Hope, B.C Canada
Here is a video of how to pressure check a two stroke: https://www.youtube.com/watch?v=zdq7NRcUIp8
The only thing they forgot to mention was that the piston needs to be in the down position. Anywhere near BDC is good.

You do the vacuum test the same way except you remove the Schrader valve and hook up the suction gun with the check valve in the line and you don't have to spray soap water around. If the gauge drops vacuum you got a problem.

In that video he has a fitting that goes into the sparkplug hole. I use a block off plate on my exhaust. It's all the same thing. You pressure up or vacuum up the Engine and watch the gauge.
In the picture above of my machine you can't see a gauge because it was on the plug that I had in the intake.


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