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Old 08-10-2017, 09:02 PM
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Default leak down tester

     

where to to get the parts to seal off exhaust and one to attach to intake to attach the hose from leak tester on yz 250r.also can u preform a test at the head . thanks

Last edited by bjunior; 08-11-2017 at 02:40 PM.
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Old 08-11-2017, 12:53 PM
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I made one and it works well. I think I spent about $25.00 to build mine.

I sealed the exhaust with a plumbing mechanical plastic test plug. Home depot has them in many sizes, very cheap.





I sealed the intake with the same type but a different size.



I got the fitting and gauge at home depot along with the hose and 2 clamps. The lower end is actually a hose and fitting from a cheap compression tester that screws into the cylinder spark plug hole.






Seal everything with Teflon tape and test the tool for leaks BEFORE you attach it to the cylinder.

Here is how it look attached to the bike. you need to set your piston at BDC and your may need to seal any power valve hoses if your bike has them like this GASGAS 300. You can use a simple bicycle pump but do not pump more than 4 pound PSI at the start because the pressure will continue to rise after you stop pumping. Anymore than 6 pounds and you will BLOW OUT your crank seals.



Everything worked real nice on this motor and it held 5.5 PSI for over 25 minutes.
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Old 08-11-2017, 12:59 PM
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is that for a 2 stroke
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Old 08-12-2017, 12:40 PM
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The task itself and resulting readings and possible remedy, if any, require a certain level of comprehension. That being said, if your bike has an exhaust port an intake port and spark plug the process as properly explained above will work on your machine.



Nice job moto7 that detailed explanation should help out quite a few interested folks
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Old 08-12-2017, 11:59 PM
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Quote:
Originally Posted by wFo250 View Post
The task itself and resulting readings and possible remedy, if any, require a certain level of comprehension. That being said, if your bike has an exhaust port an intake port and spark plug the process as properly explained above will work on your machine.



Nice job moto7 that detailed explanation should help out quite a few interested folks
Thanks! I am glad that I could be of help.
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