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  1. #1

    compression tester length

    i've searched and i can't seem to find the answer, although its probably simple. i bought an actron compression tester kit from a local parts store and the 14mm long reach attachment isn't as long as my br8es-11 on my 04 xlt 1200. does this matter? i don't want to open the kit if it won't work so i can return it. thanks.


  2. #2
    All hail the Chief! fullboogie's Avatar
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    Nah, I wouldn't worry about it.

  3. #3
    DAGO RACING CREW 97GPSLEEPER's Avatar
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    You will get a lower reading if the attachment is shorter than the spark plug length. I have tried all the attachments in my kit, and the longer one gave me a higher compression reading.

  4. #4
    All hail the Chief! fullboogie's Avatar
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    How much are we talking about Brandon? Enough to justify going out and buying a new attachment? If you're talking a couple of PSI, well....
    Last edited by fullboogie; 05-08-2008 at 03:42 PM.

  5. #5
    clipped from SBT for the old shool yam's but just the same
    With a good compression gauge you must make sure you have the correct adaptor. There are ½ inch and ¾ inch spark plug reaches and you have to have the correct one or your compression reading will be incorrect. Yamaha uses the ½ inch reach, veryone else uses ¾ inch.

  6. #6
    james k's Avatar
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    My short attachment yields 5psi more comp than the longer one i have every time......

  7. #7
    DAGO RACING CREW 97GPSLEEPER's Avatar
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    Quote Originally Posted by fullboogie View Post
    How much are we talking about Brandon? Enough to justify going out and buying a new attachment? If you're talking a couple of PSI, well....
    It was around 5 psi difference. Who knows, it may have been the difference in the o-rings on the adapters.

    Which ever length is used the oring has to seal. If too long of an adapter is used the threads will bottom out before the o-ring can squish down and seal.

  8. #8
    basically i tried to find a mirror image of my br8es plug that is used on my xp and my xlt. the sears kit had a 14mm x 18mm that looked like a perfect fit. $60 was a little spendy but at least now i can check my compression. i got 110 psi across the board with the throttle closed (forgot to open it).

  9. #9
    Chrisrokc's Avatar
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    I tried my compression kit out today with the longer fitting. The longer fitting matched the length of the spark plug. It yielded a lower compression than using the shorter. However I am not sure if there was a leak. The O ring was kinda jacked.

    With the short on my 1390 it was 145-150-150.

  10. #10
    Me Hahn and Joe H204YOU's Avatar
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    Did you getr out yesterday?

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