CR125 checking for air leaks…

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    • January 30, 2016 at 11:42 am #60223
      Glenn L Riggs
      Participant

      The orange stuff is Hi temp rtv or silicone available at your auto parts store. and it gets over everything.

       

    • January 30, 2016 at 2:16 pm #60235
      James McMahon
      Participant

      A leak at the exhaust manifold, while its not optimal, is not considered an air leak in the traditional sense. It will throw your test off though.
      How much is the pressure dropping after five mins?

    • January 31, 2016 at 7:39 am #60263
      Brad Alan
      Participant

      Thanks for the replies. I will get the silicone today at the auto parts store and retest.

      Since it was leaking when I did the test I can’t tell you how much it dropped off.  I will let you know when I do the test again.

    • January 31, 2016 at 10:42 am #60295
      Sanford Mitz
      Participant

      From what is sounds like, you are blocking the air at the pipe. Pull the pipe and put a plug in the exhaust manifold. You can get one at the hardware store. I use the rubber plug with a wing nut on it. Put it in the manifold and tighten it up. A stethoscope is good or a length of tubing for checking. You can also spray simple green on critical areas and look for bubbles. Check around the powervalve plugs. Those o rings are easily damaged when sliding the plugs in. Crank it up a little higher and then log the drop per minute.  You are definitely on the right track.

    • January 31, 2016 at 4:23 pm #60343
      Brad Alan
      Participant

      Alright – So I got the high-temp silicone and put it b/t the manifold and cylinder and plug in the manifold again, and pressurized the engine up to 5.5psi.  I let it sit for 5 mins, came back.  Still at 5.5psi.  Looks like its all good!

       

      Thanks for all of your help.

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