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  1. #1071
    I have found a lot of threads that say a stock engine compression is normally between 110 and 130. that puts mine on the higher end of the scale but since the motor is basically brand new maybe that is correct? Also I tested the compression with all the plugs removed. It appears some people recommend checking it with the plugs installed. If I have time later on today I will recheck the compression with the plugs installed. I did email ADA and I am curious what their response will be.

  2. #1072
    I rechecked the compression with the spark plugs installed, cold engine and throttle wide open.
    Cylinder 1 (magneto side)

    Cylinder 2

    Cylinder 3


    They are all between ~150-152 psi testing it with the plugs installed. From the threads I have found that appears to be safe for 93 octane but definitely on the higher side. I haven't tested it in the water yet. I would like to hear from ADA first. I am also thinking about picking up another compression tester to verify the gauge on this Snap On is accurate.
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  3. #1073
    Mine are around 130-140. Every stock rebuild i have done normally around 115-120. Your elevation could be what the difference is. The engine i have on the bench i will compression test once in the ski. Just waiting on rhass to send us a drive shaft thru hull.

    Heres a pic i wasn't able to get out there, but if you look you can see it mounted to furthest most bolt on the cover should give you an idea of what i did

    Attachment 462433
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  4. #1074
    Quote Originally Posted by turboman412 View Post
    Mine are around 130-140. Every stock rebuild i have done normally around 115-120. Your elevation could be what the difference is. The engine i have on the bench i will compression test once in the ski. Just waiting on rhass to send us a drive shaft thru hull.

    Heres a pic i wasn't able to get out there, but if you look you can see it mounted to furthest most bolt on the cover should give you an idea of what i did

    Attachment 462433
    I can't see it in the photo. Maybe you posted the wrong photo? All I see is the pipe.

  5. #1075
    I received a reply from ADA on a Sunday night! That is incredible customer service. Here is their response:

    "Stock compression at sea level is generally around 135lbs and the 42's increase the compression by 20lbs. You will be fine when using premium pump gas.

    When we test compression, we leave the plugs in the cylinder(s) that we are not testing.

    Regards,

    ADA Racing"

    Sounds to me like I am right in the range I should be in and I am good to go with 93 octane. If the weather is good tomorrow I should be able to test it out.

    Btw, my house is approximately 450 feet above sea level according to Google Earth. I don't know if that makes a difference or not.
    Last edited by beekermartin; 05-31-2020 at 09:52 PM.

  6. #1076
    I went back to the begining of this thread to look something up and came across my original compression test results. When I first got the ski I tested the compression and all the cylinders were between 126 and 129 psi. That was before my first seizure. I forgot I had gotten numbers that high back then as well. Needless to say I feel confident that I am safe with the ADA 42cc heads.

    Is there anything I can do to detect detonation before it causes a failure?

  7. #1077
    Listen real hard for knock or pinging is probably your best bet... Maybe run it for a while and then check the pistons / cylinders to see how it has been holding up? Don't think there is any great way to monitor knock on these

  8. #1078
    As Ice Cube would say "today was a good day".

    I tested it out for about a half hour and it is running perfectly. I loaded it back on the trailer and stopped by a local power sports store and talked to one of the owners. He builds high performance 2 stroke stand up skis with Dasa motors. He knows a lot about two stroke jet skis. I told him all I have done and pulled a plug for him to inspect. He said everything looked great and I should be good to go. I then asked him if he would take it for a spin for me so I could get his opinion of how it was running. He said yes and we took it to the ramp. He rode it for about 5 minutes and he said "it is running good, very good actually. It feels like a brand new ski."

    That was great to hear from someone who has forgotten more about 2 stroke skis than I will ever know. I finally feel confident to start riding it harder. Of course a high performance 2 stroke ski can blow up without much warning but I feel like I have done all I can to prevent that.

    I still need a working speedometer and I want to install a bilge pump but besides that it seems like she is ready for the season.

  9. #1079
    steve45's Avatar
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    That's great!

    We knew you could do it!

  10. #1080
    Awesome. Enjoy!


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