compression test ktm 300 2001

Discussion in '2 smokers' started by ssregal39, May 24, 2012.

  1. ssregal39

    ssregal39 Been here awhile

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    i have forgoten have many times to kick a 2 stroke for compression test.
    anyway, on a cold motor, i kicked 6 good times and got 175. seems ok to me.
    what do the other 2 smokers think?:norton
    #1
  2. Reino

    Reino Been here awhile

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    I am assuming that is psi, but according to my limited knowledge base i would say that is reasonable.:deal



    A 300 should get around 200 - 210 psi on a fresh top end. Minimum acceptable compression is generally about 150 psi.
    http://www.dirtbikeworld.net/forum/archive/index.php/t-40434.html (12th post from top)

    proper pressure after 5 kicks should be in the 175-190 psi range on fresh top end for that bike.
    http://answers.yahoo.com/question/index?qid=20070920062714AAfJjoe

    A 300 will run with 120 but not well. Start saving for a top end. If you let it go too long you will need to replate the cylinder.
    http://boardreader.com/thread/05_300_exc_compression_d89Xl3gb.html

    what model is your bike? (sx, xc, xc-w or an exc)

    And remember Google is your friend.:D
    #2
  3. ssregal39

    ssregal39 Been here awhile

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    thanks. it's an exc. the motor should be fine for a while i think.
    now i just need to sort the jetting.
    #3
  4. Reino

    Reino Been here awhile

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    Same here on the jetting, good luck with the bike i hope you get every thing sorted. :D
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  5. w33b8t1

    w33b8t1 Been here awhile

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    Oops responded to the wrong thread.
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  6. Foot dragger

    Foot dragger singletracker

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    I know this is an old thread,but from 04 to present a KTM 300 is rated at 165psi from factory,not 200 or 210.
    An SX-250 may be at 240 or more but not a trailbike oriented 300. These are KTM specs not a hearsay deal.

    My 2014 300 XCW showed 170psi at 87 hours of tight trail riding,hardly ever on the gas,no room in the woods around here.

    Method is #1. Hold throttle wide open.
    #2. Press kill button.
    #3. Kick that mo-fo like you mean it till the gauge stops moving,wear real boots. dont use the button.

    Jeff Slavens has a good video on checking compression on youtube.
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  7. Reino

    Reino Been here awhile

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    My 300 was 175psi just after a rebuild. I would recommend turning off fuel and draing the float bowl to not get fuel in the compression tester.
    #7
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  8. Foot dragger

    Foot dragger singletracker

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    Ive never heard of draining the float bowl to check compression,but if it feels good do it.

    I was happy to see 170psi after 87 hours,I think at mellow trail riding speeds 200 hours is easily doable if air filter is kept clean,gas is clean. No extended intense screaming of engine. I ran an 09 200KTM out to 200 hours,everything checked out usable,it ran the same with new piston/rings as it did with the original. Guys who ride track or desert may need a top end at 80 hours.

    Now if I could only get the starter to work again.
    #8
  9. Reino

    Reino Been here awhile

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    i ride desert and my 300 is 175PSI (i made a mistake mine was 178PSI after rebuild) last time i checked it and that was with 900km of riding (did not have a hour meter at the time) and is still running strong. And the last i cheched was about 200 km ago. I am running 40:1 fuel oil ratio and jetted good (got a smart carb XD, now i am bragging. not on the bike yet) with full synthetic castrol 2t oil
    #9