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$17 Leakdown Tester

Faded

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#1
I've realized the importance of a leakdown tester but have always steered away from purchasing one do to the cost. After doing some research on the net and getting different ideas on how to make one I finally broke down and bought the stuff. As the title says, total cost was less than $17.00 (before tax). The sizes I make reference to are the ones my bike required. You might take the time to measure your intake and exhaust manifold to make sure you pick up the correct pieces. Also, with this tester there are no provisions for leaks that might occur around the various powervalve assemblies out there. Also, I am not trying to take credit for the design or the idea, I'm just basically passing along the information, giving people an idea for parts, and showing how easy/cheap one can be made. With that said, here you go.

The parts I used are as follows including the price I paid for each:

3/4" Pipe Pressure Gauge (used to test natural gas pipes), Home Depot - $12.98
3/4" to 3/4" Pipe Coupler, 1-1/2" Long, Home Depot - $0.74
1-1/4" Schedule 40 PVC Pipe Cap with 3/4" internal threads, Home Depot - $0.75
1-5/8" Expansion Plug, Local Auto Parts store - $2.49

Here is a picture:
 

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Faded

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#2
When assembling the Pressure Gauge/Coupler/PVC Cap I would recommend the use of some pipe sealant/dope. I had some laying around so I didn't include this in the cost. My carb is a 38mm and the pvc fits very snug. I would imagine this would work for most bikes. For the exhaust I realize some of the smaller (125cc) bikes might be different. Don't worry, you can get the expantion plugs in 1/8" increments, they expand to 1/8" over there 'listed' size (my 1-5/8" will go up to 1-3/4") and the cost is about the same.

Here is another picture with it put together, I've shown the intake and exhaust manifolds so you get the idea of how it's suppose to fit:
 

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Faded

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#5
MXFastGuy,

Thanks. ;)


dthoms,

I would leave the reed cage in. The reed cage is prone to leakage just like any other gasket areas of the the motor. This way you will be able to test the two seals between the motor/reed cage/reed stuffer.
 

mylesc

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#6
I built the same tester yesterday and will betrying it out today. I have a 97 CR250 and found that a 1&7/8" expansion plug works best to seal the exhaust port. Thanks for the cool tip on this DIY tester.
 

Faded

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#7
mylesc,

Cool! :cool: Let us know how it works outs. I built mine prior to tear down so it'll be a while before I get to use mine.
 

Casper250

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#8
What pressure are you supposed to use and what are exceptable ranges?
 

Faded

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#9
Start at 5psi, you shouldn't lose more than 1 psi per minute otherwise you need to start looking for a leak. Go Here and scroll down to 'Crankcase Pressure Testing'. :thumb:
 

darringer

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#10
Faded, I went to Home Depot to find the pressure gauge and they looked at me like I was from Mars! Can you tell me what department @ Home Depot it was in, and any other info on the gauge you have.
Thanks, Darrin
 

Faded

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#11
It should be by where they keep the metal pipes and fittings for natural gas lines or by the heaters/furnaces. I'm not sure how it is in your area, but our building code requires the natural gas company to come out and conduct/verify a pressure test of natural gas lines. The home owner supplies the equipment (gauge, cap on end, and air to pressurize the pipes) and since I installed a gas fireplace a couple months back this item was a carry over for me. I did make sure that they were selling them at my local Home Depot when I picked up the other stuff mainly to verify the price. If you want I can swing by tonight and get a part no. or SKU or something and I'll let you know tomorrow. ;)
 

darringer

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#12
If you can swing by and get the SKU that would be great! No rush, whenever you happen by there is fine.
Thanks again, Darrin
 

Faded

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#13
Darrin,

Here ya go:

30lb Gas Test Gauge by Prairie Home Product
Item # 51803
SKU # 7 39236 51803 3
$12.98/ea.
 

darringer

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#14
Thank you VERY much!