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1/29/2018
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Bethania, NC
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Alec138
8/20/2018 12:45pm
8/20/2018 12:45pm
Edited Date/Time
9/8/2018 8:59am
What all is needed to build one for cheap? And how exactly? Also will a bike pump work instead of an air compressor? I know you only put 5-6psi or you risk blowing bottom end seals.
How long ahould I wait as well? I saw one guy say wait an hour, some guys say 5-10 minutes. How many psi can I lose (if any) and be good?
What should I use to spray around the motor inside and out and not ruin anything?
I know it seems straight forward, but I have never had to do a leak down teat by myself before... so some advice as well would be great.
Thanks.
How long ahould I wait as well? I saw one guy say wait an hour, some guys say 5-10 minutes. How many psi can I lose (if any) and be good?
What should I use to spray around the motor inside and out and not ruin anything?
I know it seems straight forward, but I have never had to do a leak down teat by myself before... so some advice as well would be great.
Thanks.
Pump up to about 6 psi with the engine at top dead center. It should hold for about 4 minutes with less that 10% lose.
That checks your head gasket and rings.
If that checks ok, then repeat at BDC to check reeds, cylinder gaskets and seals. ( It will leak off faster in this position.)
Paw Paw
You can use a water pressure guage.
There are so many different ways this can be done on the cheap and like you said there are many good videos on youtube to help.
Paw Paw
The Shop
Paw Paw
However I disagree with it checking the rings on a 2 stroke. Rings have a small gap the ends (clearance listed in service manual) so air flows right past rings. The 2 stroke test checks the sealing of the complete department. Power valves can often have leaks.
A 4 stroke leak down test tests the leak % and can point you at rings, gaskets and valves for leaking.
As a professional MC mechanic I purchased mine from Matco. These are the 4 stroke leak down &compression gauge. I used the spark plug thread on the 2 strokes with a hand pump with low PSI gauge. I lent it to someone and well they kept it so no picture
You are trying to make a mole hill into a mountian here!
First read this from Harry Klemm. http://www.klemmvintage.com/airleaks.htm
Then order this in. This is the basis for your tester.
https://www.ebay.com/itm/Gas-or-air-test-set-with-2-15-PSI-gauge-3-4-NP…
Easy Peasy baby!
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