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  1. #1

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    MSX110 Normal Top Speed

    Going to Lake Powell AZ for a houseboat trip in July 1, and am trying to figure out which two of three MSX skis to take. Two have problems and I have to iron them out.

    Just aquired msx 110 and 140 and tried them yesterday. Disappointed in the 110, has sufficient takeoff power, but only manages 40 mph top speed with one boost bar remaining on the boost gage. Starts fine, no engine warning flashes, good new premium gasoline. No history available on machine other than I installed a new oil filter, proper Mobil synthetic oil with no overfill (absolutely according to directions). Did note stubborn starting with warm engine twice during afternoon's runs, out of about twenty starts. What have the 110 units had for top speeds? Nice looking ski in great cosmetic condition, would keep if top speed were in the low to mid 50's, anybody want to buy it and the aluminum trailer- $4,000.

    The 140 apparently ran flawless, but top registered speed was 60mph for a few seconds, seemed more consistent at about 58 on smooth chop water. I expected more, in that my old SLX1200's ran around 64mph.

    I have an MSX150 that I put in the water for the first time in 1 1/2 years after I cleaned the intercooler of oil ingestion problem. Replaced both boost sensors with brand new units. Expected wonders, got little. Check engine light right away, 30 mph . Used to have overboost cutouts, now just half boost. Have the new Pierburg boost switch, but may have it hooked up wrong, tried switching hose connections to different spots, no change. I know this one is ripe for all sorts of comments, go ahead.
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  2. #2
    Click avatar for tech links/info, donation request K447's Avatar
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    What RPM are you getting from each engine?

    Cylinder compression check on each engine?

    Waste gate moves easily on both turbos?

    Turbo display is not useful, just go by RPM instead.

    Oil level on both Weber engines is right near the bottom of dipstick, correct?

  3. #3
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    Maximum RPM on the MSX110 is 7000, after which the ECU is programmed to reduce boost and gradually close the throttle body. Top speed should be around 48-50 mph if turning a solid 7,000rpm on a good condition pump and impeller.

    For the MSX150, the maximum rpm is 7,200. Same principle applies to the MSX150, the ECU will derate power over 7,200rpm. Typical MSX150 top speed is around 57 to 60mph.

    Reflashing ECU for greater performance is the most efficient way to safely increase power and top speed. The MSX110 reflash will raise rpm to around 7,500 on the oem prop and the MSX150 reflash will raise rpm to around 7,700 on the stock prop. It is also possible to reflash a MSX110 into a MSX150, but I suggest to use the better MSX150 intercooler and impeller if going in that direction.

  4. #4
    Click avatar for tech links/info, donation request K447's Avatar
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    Thanks for dropping by Martin.

    Always good to see you on the forum

    BTW, do you still offer the diagnostic kit for OBDII style Weber engine monitoring via an iPhone?

  5. #5

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    Thank you K447 and Desperado for your replies, much appreciated.

    1- I paid little attention to RPM on any of the skis while at the lake
    2- Have not performed a cylinder compression check on either 110 or 150
    3- Waste gates were moved by hand prior to trip, but not throughout entire travel range, will do so
    4- oil level is NOT right near the bottom the the dipstick under this process a) loosen oil fill/dipstick cap to point of being fully unthreaded b) start engine and let run 20 seconds c) remove dipstick and wipe d) reinsert dipstick fully without threading it in d) remove and read- reads below the full mark slightly, 1/4"

  6. #6
    Click avatar for tech links/info, donation request K447's Avatar
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    Click my signature link and read about the correct oil levels for the Weber engines.

  7. #7

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    Yes, as per the diagram shown for a cold engine (20-30 seconds run) the oil level is at the upper operational point indicated in the drawing, about 1/4" below the "overfill" mark on the dipstick.

  8. #8
    Click avatar for tech links/info, donation request K447's Avatar
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    Quote Originally Posted by comfort54 View Post
    ... per the diagram shown for a cold engine (20-30 seconds run) the oil level is at the upper operational point indicated in the drawing, about 1/4" below the "overfill" mark on the dipstick.
    The oil level when cold needs to be no higher than the lowest marking on the dipstick, in the green zone on the colored diagram, or even slightly below the end of the dipstick.

    This is why we say the dipstick markings are misleading. Those higher markings apply to the oil levels in a HOT engine. When the engine is cold the oil level must be much lower, right near the very bottom of the dipstick.

  9. #9

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    OK. I did not understand these oil filling instructions correctly. "Operational Range" does not include the cold startup oil level check! I will suction pump out the appropriate amount from each craft, as I was CAREFUL to get them both just right! I have not pulled the sensors to inspect for oil film, but apparently this must be the case, negates my intercooler cleaning project. Cleaning the new sensors suffice? If so, soapy water, spirits, spray?

    Also- I did check the wastegate mechanism on each craft, they both operate freely throughout the entire operation range.

  10. #10

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    I pulled the post intercooler sensor off of both skis this afternoon, expecting oil film, none was present. The new Bosch 0 261 230 042 from the MSX150 looked like it had just been installed, no oil whatsoever.
    The sensor from the MSX110 is not new, but it looks real good. There was the very lightest pickup of and oil film around the green sealing O ring, this is perhaps installation lubricant.
    Fears of oil through the intake circuit may be still be warranted, but I can see no evidence of oil reaching the 1rst sensor in line.

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