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Thread: Gain or Loss?

  1. #1
    jdog800's Avatar
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    Gain or Loss?

    On the GPR (or really any 2stroke)platform do u usually find, that after initial break-in you gain a few pounds of compression or loss a few pounds of compression?


  2. #2
    Moderator OsideBill's Avatar
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    I gained

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    jdog800's Avatar
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    how many pounds?(average)

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    Moderator OsideBill's Avatar
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    3-4 I'm going to do a test this weekend I'll post results been 20 hours since built I was planning on pulling the head to check wash and cylinders too. This was fresh bored and plated cylinders from Lowell and fresh Pro-X pistons. was 140 avg at initial test and 143-144 after second tank of gas.

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    One day at a time..... N8R's Avatar
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    I gained 10lbs

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    jdog800's Avatar
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    10lbs is damn good. Which breakin method did u use?

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    Moderator OsideBill's Avatar
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    Quote Originally Posted by N8R View Post
    I gained 10lbs
    Damn I have to go test mine now this is great results.

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    One day at a time..... N8R's Avatar
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    Quote Originally Posted by jdog800 View Post
    10lbs is damn good. Which breakin method did u use?
    when Jim put the motor together it was at 155lbs when I first put it in the water then at about 10 hours it was at 165lbs. kept blipping the throttle keeping it under 5000 rpms for a half tank of 32-1 amsoil dominator then full throttle from there on mixing at 45-1 after first tank now has 240 hrs

  9. #9
    jdog800's Avatar
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    interesting.....u never pinned it at all for the first half of tank?

  10. #10
    Moderator OsideBill's Avatar
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    Ok looks like I need to investigate further. #1 142, #2 146, #3 150 good thing I was planning to pull the head anyways.

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