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  1. #1

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    Steps on doing a compression test on a 2 stroke?

    New to the sport and just wanna check my compression ? 96 blaster II


  2. #2
    WATER WOODY's Avatar
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    Make sure you have a fully charged battery.Pull the plugs out.Start with #1 ,with compression guage screwed in to head.It would be a good idea to make sure the compression guage threads are the same depth as your plugs are. make sure that the plug wires are clear of everything and not touching.Hold throttle wide open and hit the started for about 5 seconds(till the guage stops) and get a reading.Document this reading and more on to the next.I ALWAYS go back through and do a second test to make sure all readings are correct.

  3. #3
    Nothin' runs like a Deere IowanGPR's Avatar
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    do you pull all plugs before you do the test? I've heard to remove all 3 when doing this?

  4. #4
    Moderator RX951's Avatar
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    * Remove all the wires
    * Pull 1 plug at a time
    * Cranking RPM's need to be atleast 400
    * Crank the motor over with the throttle wide open. Make sure the gauge is depressured prior to starting.
    * Watch and take not of how fast it obtains its higheest readings. Usually after 5 seconds.
    * Install plug, move on to next cylinder.
    * I alwasy do this on a cold motor every time to obtain the same basline readings and conditions.

    check this thread out http://www.greenhulk.net/forums/showthread.php?t=9411

    .
    ..

  5. #5

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    Didn't I read somewhere that the power valves s/b wired open somehow when doing compression test? If so how do you accomplish this?

  6. #6
    Moderator RX951's Avatar
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    No, just keep your throttle wide open.

    Think about skis with gas valves, like the GPR's with RIVA gas valves or the Sea-doo's with gas valves, they don't keep their valves open.

    Just hold the throttle trigger wide open when cranking.

  7. #7

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    I knew you'd know, and you knew I'd know you'd know, so now we all know.
    Know what I mean.
    All them knows and knews, looks silly don't it?

  8. #8
    Moderator RX951's Avatar
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    Quote Originally Posted by RaystownLake GPR View Post
    I knew you'd know, and you knew I'd know you'd know, so now we all know.
    Know what I mean.
    All them knows and knews, looks silly don't it?
    its all good bruh, we ask becasue we don't know and to learn !!
    I learn something new everyday

    ya know...or knew... ..heeeheeeE !

  9. #9
    WATER WOODY's Avatar
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    I test mine with all 3 plugs out.This way,you get an 'even' rpm all the time especialy if you have a cylinder with lower or higher compression.This may change the cranking rpm a little when you are checking the other two.Someone might come on here and try and chew me up for my method but its how i do it! I check my compression with a hot motor because thats the compression you are running when the motor is hot.

  10. #10
    Robsauto2's Avatar
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    Quote Originally Posted by WATER WOODY View Post
    I test mine with all 3 plugs out.This way,you get an 'even' rpm all the time especialy if you have a cylinder with lower or higher compression.This may change the cranking rpm a little when you are checking the other two.Someone might come on here and try and chew me up for my method but its how i do it! I check my compression with a hot motor because thats the compression you are running when the motor is hot.


    Ditto!

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