Author Topic: Leak Down Tester  (Read 5387 times)

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Offline DoldGuy

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Leak Down Tester
« on: November 15, 2009, 11:14:42 AM »
Thought this would be of benefit to our members here who care about the condition of their motor. Can also be used quickly to check the condition of a motor on a bike that you might be considering purchasing.

Items that I have been aquired to make this tool:

5' of 3/16" hose (Advance Auto)
1      3/16" Tee (Advance Auto)
1      1 3/4" Expansion Plug (Advance Auto Fits My 125)
1       2 1/4" Expansion Plug (Napa Fits My 250 & 500) (Had to order due in next week)
1       Low Pressure Gauge (It was my Dads Circa 1960, Available thru most tool dealers)
1      Custom intake Plug with 3/16" Nipple(Courtesy of our own Larry W. / Thanks Again!!!)

This will allow you to "Pressure Test" your motor (Low pressure only guys / 7 lbs & no more)

After speaking with Larry (HE is OLDER than Me :lol:) he communicated the benefit of a "Vacuum Test" on the motor due to the "Pressure Test" can sometimes help apply pressure on the sealing lip and help the seal to seal.

This tool is even easier:

1        Mighty Vac Pump (has its own gauge)
2'        3/16" Hose
1        Custom intake Plug with 3/16 " barbed Nipple (Using the same Plug Larry Made)
1        Expansion Plug (to fit your size exhaust port)

These parts are quite affordable for the average joe like me to obtain, and will be used to obtain priceless info about the condition of a motor.

Hope this Info helps & Thanks Again Larry!

DoldGuy
Its Never too Late to Have a Happy Childhood!

Offline DoldGuy

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Re: Leak Down Tester
« Reply #1 on: November 15, 2009, 11:17:48 AM »
Forgot the Air Bulb (Same One used as the Blood Pressure Bulb)that is available at most Medical Supply Companies (it was $11.95)
« Last Edit: November 15, 2011, 01:14:35 AM by DoldGuy »
Its Never too Late to Have a Happy Childhood!

Offline kaw rider

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Re: Leak Down Tester
« Reply #2 on: November 15, 2009, 11:18:20 AM »
Now How many guys pressue/vacuum test after a motor rebuild and on a yearly bases.

I think you mite get a different reading with vacuum on the intake side of cage. Inless your reeds are worn. Maybe you could install a small shim under the reeds.
« Last Edit: November 15, 2009, 11:22:27 AM by kaw rider »

Offline Larry Wiechman

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Re: Leak Down Tester
« Reply #3 on: November 15, 2009, 12:51:12 PM »
Maybe you could install a small shim under the reeds.


 A small soda straw works well and won't nick the reed or cage. Just one reed propped open is enough.
 
 Or, the carb plug could be solid and the pressure/vacuum applied through the sparkplug hole.
 
 And yes, I do have almost a decade on DoldGuy. :cry:
 You don't get too old to ride, you get old because you don't ride.
 
Larry
 
« Last Edit: November 15, 2009, 12:58:32 PM by Larry Wiechman »

Offline bob larry

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Re: Leak Down Tester
« Reply #4 on: April 21, 2010, 07:26:20 AM »
Any pics of this in action?

2001 KX500

Offline blueoval

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If some is good, and more is better, then too much is JUST RIGHT!  B.O.

Offline hughes

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Re: Leak Down Tester
« Reply #6 on: April 21, 2010, 08:04:01 AM »
Here's a picture of one installed. http://dirthammers.com/page7.php
Open Class 2-Stroke Kawasaki KX500
Yamaha 2005 YZ250
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Offline bob larry

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Re: Leak Down Tester
« Reply #7 on: April 22, 2010, 02:36:28 AM »
Awsome.....looks like a must have item.....

Could you just take the reeds off for the test?


Maybe you could install a small shim under the reeds.


 A small soda straw works well and won't nick the reed or cage. Just one reed propped open is enough.
 
 Or, the carb plug could be solid and the pressure/vacuum applied through the sparkplug hole.
 
 And yes, I do have almost a decade on DoldGuy. :cry:
 You don't get too old to ride, you get old because you don't ride.
 
Larry
 

2001 KX500