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  1. #1

    Max RPM, Piston wash or plug reading?

    I read through the tuning guide but a was just wondering what everyone prefers when tuning their high speed adjusters. I am going to try out the Peak RPM method. Can someone tell me about what RPM I should be seeing on a 96 SL780?

    I assume I just start out rich and lean out the adjusters until I hit my peak?


  2. #2
    She likes the bike. But the ski gets her wet!!!! xlint89's Avatar
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    That is the safest way (start out rich and lean it out)

    780 with the stock impeller should see around 6500 RPM peak.

  3. #3
    so my 780's stock settings are p=1 c=3/4 m=3/4 where should I start on all of those and do I adjust all of them at the same time in the same increments?

  4. #4
    She likes the bike. But the ski gets her wet!!!! xlint89's Avatar
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    Start about 1/4-1/2 too rich (OUT)

    Then dial 1 in at a time. Once you see RPM start to drop, go back to the setting you had and start tuning another cyl.

  5. #5
    wish I had a nice smooth lake that I could run WOT on for a while. It was calm right when I got out there and I ran for about 30 seconds WOT and it stayed right at around 6500 RPMS without dropping. Those were with stock settings. Would I need to be WOT longer than that to see a RPM drop? I hit the kill switch while running WOT and pulled the plugs. The white part had a little brown tint to it but it was still pretty white. maybe just a little too lean?

  6. #6
    She likes the bike. But the ski gets her wet!!!! xlint89's Avatar
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    Yeah, i wish I had a nice flat lake too, but that's why you set the ski up for the conditions you NORMALLY ride on...

    If you're running lean, it would only take a second or 2 to MAX your RPM and watch it start to fall.

    I'm not a fan of plug chops (they lie) but can be useful before piston wash is formed.

    If the plugs are new, it will take a while for color to actually form.

    If your pistons are new, do some conservative riding and get some wash formed on the domes. Then adjust by checking that, and with your tachometer.

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