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Thread: How to make a leak down tester?

  1. 02-03-2006, 05:00 PM #1
    MN250R's Avatar
    MN250R
    MN250R is offline At The Back Of The Pack Arm chair racerAt the back of the pack
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    How to make a leak down tester?

    Anyone know the parts to make one of these? or which one to get?
    I have seen people talk about using one but never seen or heard how to make it.

    Thanks!
    1986 ATC 350X
    1986 ATC Big Red 250ES
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  2. 02-03-2006, 05:03 PM #2
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    atctim
    atctim is offline Administrator The day begins with 3WW
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    What is a leak down tester?
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  3. 02-03-2006, 07:05 PM #3
    holmstrom
    holmstrom is offline At The Back Of The Pack Arm chair racerFirst time rider
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    vacuum/pressure gauge,threaded fitting for sparkplug hole,pressure pump,t-fitting,shut-off valve, expandable automotive freeze plugs,rubber hose. i think thats it.
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  4. 02-03-2006, 07:21 PM #4
    ATC90UK
    ATC90UK is offline New to the board Arm chair racerNew to the board
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    smash the ceramic off a spark plug, cut off the matal and drill it out, thats the thread sorted. Tap the hole and screw in your fitting. Attatch a tee with a pressure gauge and a tyre valve (non return). Pump it up with your footpump or compressor - job sorted
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  5. 02-03-2006, 07:25 PM #5
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    dreadhed
    dreadhed is offline Got The Holeshot Arm chair racerJust too addicted
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    I would just go buy one. You can find them at auto stores or order one they can come in handy I have one. You can also use fitting from compression tester to make one if you wanted.
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  6. 02-04-2006, 01:13 AM #6
    MN250R's Avatar
    MN250R
    MN250R is offline At The Back Of The Pack Arm chair racerAt the back of the pack
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    Thanks for all the help!
    1986 ATC 350X
    1986 ATC Big Red 250ES
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  7. 02-04-2006, 03:48 AM #7
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    Rex Karz
    Rex Karz is offline Just Too Addicted Arm chair racerJust too addicted
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    A compresson leak down tester is different from a 2-stroke crankcase leak down tester. If you pressurize your crankcase with 100 psi you will likely create more problems than you sought to find. LOL LOL Crankcase leak down tests usually run 5 psi or so, and you pump it up with a squeese bulb. Check out macdizzy's site for leak down info. I'm guessing that is the type of leak down test you want to do........ I looked at your sig.......
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  8. 02-04-2006, 10:14 PM #8
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    phil53
    phil53 is offline First Time Rider Arm chair racerNew to the board
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    an aspirator bulb for pneumatic controls works, all that is a pump similar to the hand pump on what the nurse checks your blood pressure with. some dive shops carry a similar pump also.
    check the duncan racing website for a tech article on this procedure.
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