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  1. #1
    jeffyp06's Avatar
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    HELP 01 gpr misfiring....

    i was riding yesterday when it started to bog down and stall out. i thought right away battery due to its lack of wanting to start. i got it running and limped across the lake then when i went wot it bogged down again and began to only fire off the middle cylinder..... ive checked the battery its fine, and plugs look good also.... does anyone have any suggestions?


  2. #2
    This is how I run a jetski shop in the desert nmpeter's Avatar
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    if you are having battery charging/battery quality problems you need to check that first. pull the battery, if there is little or no electrolyte in there it's a good possibility you've damaged the cdi due to overvoltage. get a properly serviced battery in there, check/change the plugs and let us know what happened.

  3. #3
    powerstroke specialist mikegp's Avatar
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    Quote Originally Posted by nmpeter View Post
    if you are having battery charging/battery quality problems you need to check that first. pull the battery, if there is little or no electrolyte in there it's a good possibility you've damaged the cdi due to overvoltage. get a properly serviced battery in there, check/change the plugs and let us know what happened.
    that's not entirely true. that's why the are equipped with a voltage regulator.

  4. #4
    This is how I run a jetski shop in the desert nmpeter's Avatar
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    when a voltage regulator is bad (and they are easily damaged when the battery loses it's ability to buffer spikes )....it (higher then expected charging voltage) will very often boil out the battery electrolyte and then take it's rath on to other components in the system..typically the cdi is the first thing to go belly up.


    That's entirely true

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    Quote Originally Posted by jeffyp06 View Post
    i was riding yesterday when it started to bog down and stall out. i thought right away battery due to its lack of wanting to start. i got it running and limped across the lake then when i went wot it bogged down again and began to only fire off the middle cylinder..... ive checked the battery its fine, and plugs look good also.... does anyone have any suggestions?
    Why do you think it is the battery or charging system? Could it not just as easily be from a bad cylinder or engine damage in general? Have you checked compression?

  6. #6
    THE PLATE MAN JIM'S PERFORMANCE's Avatar
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    a bad battery is not going to affect a cylinder running bad and others running good do a compression test.

  7. #7
    MSRXP's Avatar
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    Quote Originally Posted by JIM'S PERFORMANCE View Post
    a bad battery is not going to affect a cylinder running bad and others running good do a compression test.
    Exactly! Do a compression check, change the plugs, and run it again. Post the results.

  8. #8
    powerstroke specialist mikegp's Avatar
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    Quote Originally Posted by nmpeter View Post
    when a voltage regulator is bad (and they are easily damaged when the battery loses it's ability to buffer spikes )....it (higher then expected charging voltage) will very often boil out the battery electrolyte and then take it's rath on to other components in the system..typically the cdi is the first thing to go belly up.


    That's entirely true
    if the voltage regulator is bad ,how do you think its going to burn the cdi,when there is not voltage going into the system?
    this is A electronic voltage regulator,not a mechanical regulator from the 1950,s .i have seen them charge or not charge,but i haven't seen them over charge yet.
    i have not had any chance of experience a voltage regulator over charging yet,normally the just stop charging.
    correct me if im wrong, i want to learn more.please.
    the only way to learn more is to ask.sorry.

  9. #9
    This is how I run a jetski shop in the desert nmpeter's Avatar
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    I see all manners of electrical problems here. Perhaps our low humidity high temperature high altitude environment helps batteries get boiled out faster. I've had a number of cases where voltage regulators weren't doing the job, and pretty typical when I have a ski with an emm problem, there is some cheap ass walmart battery in the ski with one or more one dry cells. My most recent Yamaha repair was a 1200 with a blown cdi...battery was dry as a bone when it came in and the regulator was bad, it was letting the battery get over 15 volts at 3k rpm/ Funny thing on that one two..the ski had a long history of being a cold start problem and the owner had installed primers last year.

    with the replacement cdi, somehow she became a one push wonder, which I found kinda shocking

    The crummy connector design for regulators on some Yamaha can also create a high charging voltage issue/

    of course, we can be totally off base on the diagnosis, but you gotta start somewhere and I can't pay my bills if I get in the habit of making a bad diagnosis.

    At my place people could save some big repair bucks if they just bought a quality battery. I've espoused on this in other threads. People by that walmart Chinese minimum spec stuff, and they have all kinds of problems.

    ski having a problem, not starting with battery suspect..and then only firing on one cylinder would send me straight to have a look at the cdi after putting new plugs in

    Voltage regulators can be damaged in a number of ways. most common is a loose battery cable or a dry battery.

    The regulator in my ford p/u ( electronic built into the alternator) overcharged my battery so badly it damaged it and I knew when I put a new battery in ( an AGM battery of course)I had to change the alternator also. The dash gauge was not in the usual place that day ( way higher then normal, just into the red) and I said " I'll deal with that tomorrow"..well when I went to leave for the day the battery had nothing and jumping it was not effective. Battery had been smoked as it was likely it had been getting overcharged for some time ( I sore this year I'd put a digital dash meter in there)

    Sudden problems in my experience are electrical in nature adn that's the fastest and cheapest thing to chec out when somebody comes in with a ski that "stopped running right...all of a sudden)..of course lots of folks won't say they have been nursing a problem ski all summer, but that comes out in the tank test after all the electrical and compression checks are done.

  10. #10
    jeffyp06's Avatar
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    well did a compression test today and im getting no compression at all on cylinder 1. idk if thats normal ive tried it a few times and still nothing. and the other two read 120 psi

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