Motor just quit ..... where do I start looking
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Motor just quit ..... where do I start looking

  1. #1
    Senior Member Franger's Avatar
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    Default Motor just quit ..... where do I start looking

    I put the boat in the water yesterday for the maiden voyage. Started great and ran awesome. I ran it around the lake for about an hour minutes just cruising at 2500 for a while, then up to 3000 then back to 2000 then up to 2500 then to 3500 .... you get the idea. During the time we were cruising we stopped a couple of times and switched seats so my son could drive, I made a few burn outs nothing big ..... like a 6-7 second blast, it ran great!!

    We went to the ramp and got the camera to go to the end of the lake to shoot some video and while just cruising along at 2500 rpm the motor abruptly just stopped. I checked the fuel pressure gage and it shows while the pump is working there is 7lbs at the regulator.

    I got it home and pulled the plugs, they all look great, pulled the valve covers, didn't see anything obvious. Turned the motor over with a breaker bar ..... perfect with no noises or tight spots, next I hit the starter, motor spins like a champ. Pulled the dist cap and the rotor rotates, all the rockers do what they're supposed to do while the motor is being turned over ???? I'm thinking it's my most favorite thing of all ...... electrical

    I'm running a MSD 7AL-2 with a MSD Pro Power Coil

    Sure would appreciate thoughts and ideas guys, thanks in advance.
    Last edited by Franger; 09-30-2012 at 01:53 PM.

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  3. #2
    Senior Member EVILFORCE's Avatar
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    Start by pulling a wire and checking for spark. And then....
    No Fool Like A Old Fool is there?

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    Just Me snoc653's Avatar
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    The question is are you getting spark to the plugs and fuel through the carb. Pull a plug wire and check it for spark as indicated and look down the carb to make sure there is fuel getting to the engine when you push the pedal down. More than likelly it will be one of those two problems.

    MSD boxes are known to go bad due to insufficient ground and low voltage. Double check to make sure the box has a good ground (after you make sure it is still functioning). Basically start at the plug and work your way back to find out what isn't working if it isn't getting spark. Then start at the other end and work forward though the trigger and make sure there is power all the way to the plugs. Where the two break down is where the fualt is.

    If it turns out to be a fuel issue, start at the tank and work your way to the carb. It is very easy for trash to clog a filter, plug a jet, ect.... And trash in the fuel is a common problem on a boat that hasn't run in a while.

    Good luck
    So many projects, so little time

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    New here Beer:30's Avatar
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    If the plugs are out, kill the fuel and lock the carb(s) open. Do a compression test and make sure your cylinder are all OK. Additionally, this will spin the motor without a "load" and you can make sure there are no noises during rotation.
    Quote Originally Posted by gn7 View Post
    EFI is the wave of the future. There can be no denying it. Electronics have been on the leading edge of our entire lives. Not only os the magneto dead, but the standard issue CDI is wavering. Its all about total fuel, air AND spark control. Anybody that thinks its not has their head up their ass.


    2001 SleekCraft 30' Heritage SSB, open-bow mid-cuddy. 496HO / Bravo-I.

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    Senior Member Franger's Avatar
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    Had more time today to look at the boat ...... put a couple plugs in and lay'd em on the intake manifold, then had the kid push and hold the starter button .... no spark

    Could it be the coil has gone bad? How do I test the coil or msd box ???

    msd box is grounded to the battery, if the alt isn't working right in 1 hour of running would the msd pull enough from the battery to cause it to be low enough causing the msd to quit making spark??
    Last edited by Franger; 09-30-2012 at 03:55 PM.

  8. #6
    New here Beer:30's Avatar
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    Quote Originally Posted by Franger View Post
    Had more time today to look at the boat ...... put a couple plugs in and lay'd em on the intake manifold, then had the kid push and hold the starter button .... no spark

    Could it be the coil has gone bad? How do I test the coil or msd box ???

    msd box is grounded to the battery, if the alt isn't working right in 1 hour of running would the msd pull enough from the battery to cause it to be low enough causing the msd to quit making spark??
    How old is the box? I know alot of peeps on here have lost their MSD boxes like a light-switch, no warning. Just by-pass the box and run it direct with dist and coil only.
    Quote Originally Posted by gn7 View Post
    EFI is the wave of the future. There can be no denying it. Electronics have been on the leading edge of our entire lives. Not only os the magneto dead, but the standard issue CDI is wavering. Its all about total fuel, air AND spark control. Anybody that thinks its not has their head up their ass.


    2001 SleekCraft 30' Heritage SSB, open-bow mid-cuddy. 496HO / Bravo-I.

  9. #7
    Senior Member Franger's Avatar
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    Quote Originally Posted by Beer:30 View Post
    How old is the box? I know alot of peeps on here have lost their MSD boxes like a light-switch, no warning. Just by-pass the box and run it direct with dist and coil only.
    Or just be the simpleton I am and go with a mag .....

    I have no idea how to by-pass the box or I would try that .....

  10. #8
    gn7
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    Quote Originally Posted by Franger View Post
    Or just be the simpleton I am and go with a mag .....

    I have no idea how to by-pass the box or I would try that .....
    Franger, unless the dizzy is a points type, you can't bypass the box. MSD distributers are incapable of firing a coil without the box.

    Drop in the mag, and send the box to MSD. You'll need a return authorization form with it when you return it.

    Before you remove it, verfy that that you have 12v to the box!!! and the box is grounded!!!

    If you send it in, and you decide to run it when you get it back, be 100% double certain of your power connections and grounds. If the thing has a key switch, and you wish to keep it, think about a VERY good key switch. Most a murder on a MSD in a boat.

    The MSD simly will not tolerate any on-off type electricasl connections. Vibrating key switch contacts or less than perfect electrical connections will kill the things. Even you if you use a toggle switch, get a GOOD one!

    LINK: MSD return authorization form



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  11. #9
    Senior Member Franger's Avatar
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    Thanks as usual Bob, I bought the best toggle switch I could find when I re wired the boat. All the connections are new and solid, I just think it was time for it to die and glad it went quick so it didn't suffer ..... I'm going back to a mag like the good ol days

    I was talking with another member here about trading for his mag, sure glad I didn't go through with it now

  12. #10
    Senior Member SHAWN DAVIS's Avatar
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    A quick test for the box, ignition power on and jump across the 2 pickup(violet and green) wires out the box. When you pull the jumper off the wires the box should trigger a spark out of the ignition coil

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    steelcomp was here
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    As been said, almost surely the MSD box. When an engine just flat quits like that it's going to be electrical. The only other thing that -might- fail like that is the pick-up in the distributor, but those hardly ever fail. The MSD, on the other hand, is a prime suspect.
    If God is your co-pilot, change seats!
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  14. #12
    Senior Member Franger's Avatar
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    Quote Originally Posted by steelcomp View Post
    As been said, almost surely the MSD box. When an engine just flat quits like that it's going to be electrical. The only other thing that -might- fail like that is the pick-up in the distributor, but those hardly ever fail. The MSD, on the other hand, is a prime suspect.
    Called MSD this morning and the guy said $35 minimum charge and $112 max to repair it..... I have NO confidence in MSD, I never had a problem when I ran a mag (12 years with no issues) not to say mags don't or can't fail just sayin I never had any issues so my confidence is in a mag, on the other hand my first experience with a MSD has not been good, I don't appreciate having to paddle over a 1/4 mile back to the ramp ....... shame on you MSD

  15. #13
    Bostick Racing Engines six-oh-nine's Avatar
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    Are you running an alternator? If not, before unhooking anything and sending it off, I'd check the battery. I have seen several times where the MSD 7 box wouldn't fire due to a low battery, even though it did turn over. Those puppies take a lot of juice to run and get all sorts of pissed off if they run low on voltage or are not grounded properly.
    The Bostick®

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  16. #14
    Member Boat 104's Avatar
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    Default Vertex mag

    Install a Vertex and be done with it! By the way, I like your splash guard, looks familiar.


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