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  1. #1
    hbernier's Avatar
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    Spark plugs reading

    Any expert on spark plug out there? I'm now running my 93 SL 650 on premix. Looking at the pictures, the 3 plugs look the same. Am I running rich?
    Thanks!Click image for larger version. 

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  2. #2
    She likes the bike. But the ski gets her wet!!!! xlint89's Avatar
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    Were those removed during a wide open throttle run? If not, they are readings of an engine at idle

  3. #3
    hbernier's Avatar
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    Quote Originally Posted by xlint89 View Post
    Were those removed during a wide open throttle run? If not, they are readings of an engine at idle
    Those were not. I took them out a few days after riding. I usely run at 20 mph. Should I look at the plugs immediately after a run at high speed?
    Thanks for your reply.

  4. #4
    Click avatar for tech links/info K447's Avatar
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    Quote Originally Posted by hbernier View Post
    ... I [usually] run at 20 mph. Should I look at the plugs immediately after a run at high speed?

    Thanks for your reply.
    Spark plug reading is mostly about the fuel mixture while running at high speed. Unless there is something specific being diagnosed there is not much to read from spark plugs after mid-range and low speed riding.

    At 20mph the hull is barely on plane. I would hazard that few people on here do much riding at those speeds.

    Are you experiencing any particular problem or concern with how the engine is running?

    A more readable check might be the visible piston wash patterns. This is hard to share online without a small borescope camera down the spark plug holes, or taking the cylinder heads off for photographing the piston tops. If you rarely ride really fast, and not for extended durations, the piston wash pattern may not tell us much.

  5. #5
    Hawaii's Avatar
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    Quote Originally Posted by hbernier View Post
    Those were not. I took them out a few days after riding. I usely run at 20 mph. Should I look at the plugs immediately after a run at high speed?
    Thanks for your reply.
    20 miles per hour.?

  6. #6
    hbernier's Avatar
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    Quote Originally Posted by K447 View Post
    Spark plug reading is mostly about the fuel mixture while running at high speed. Unless there is something specific being diagnosed there is not much to read from spark plugs after mid-range and low speed riding.

    At 20mph the hull is barely on plane. I would hazard that few people on here do much riding at those speeds.

    Are you experiencing any particular problem or concern with how the engine is running?

    A more readable check might be the visible piston wash patterns. This is hard to share online without a small borescope camera down the spark plug holes, or taking the cylinder heads off for photographing the piston tops. If you rarely ride really fast, and not for extended durations, the piston wash pattern may not tell us much.
    Thanks K447, now I understand why I did not see any wash patern on the piston. One of the reason I ride at low speed is that I don't like to get water splash in my face since I'm riding in salt water. I would need a bigger pwc in order to split the waves. The other reason is that at low tide, you can see big rocks emerging from water. I would not want to hit one at 55 mph when you can't see them at higher tide.
    Anyhow, I am now running on premix, but I did not remove the oil pump, just clamped the oil lines, nor did I make any settings change on the carbs. I wonder if I can run in a problem if I operate the pwc that way. Any suggestions?
    Thanks,

  7. #7

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    You might want to look at the hydroturf splash gaurd i recon it might help with keeping the spray down .

    In my experience going slower means getting wetter

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  9. #8
    hbernier's Avatar
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    Quote Originally Posted by Bone1050 View Post
    You might want to look at the hydroturf splash gaurd i recon it might help with keeping the spray down .

    In my experience going slower means getting wetter
    Did not know about this product. Thanks!

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