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  1. #1
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    4tecs and fouled plugs

    How common is it to foul plugs on these motors? Seems the chances are pretty slim but thought I would ask. Would a plug foul within the first 10 hours?


  2. #2
    Gotta love this sport! 05Limited's Avatar
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    They foul a great deal more than you would expect from a 4-stroke engine. It will usually be #1 cylinder... and it will happen quite easily an a ski that has sat through the winter.

    It still amazes me how frequent it happens considering the type engine

  3. #3
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    How do the 4-tecs act when they foul a plug?

    Run rough? Vibrate at all? Low on RPM?

  4. #4
    Gotta love this sport! 05Limited's Avatar
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    All of the above.

    I just got off the water from changing out two NGK DCPR8Es that had 7 hrs on them... granted she let the ski sit since last September. You just wouldn't think they would be effected that easily.

    BTW... I have yet to foul a Denso IXU27... how about the rest of you who are running them?

    Jeff

  5. #5
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    Quote Originally Posted by 05Limited View Post
    All of the above.

    I just got off the water from changing out two NGK DCPR8Es that had 7 hrs on them... granted she let the ski sit since last September. You just wouldn't think they would be effected that easily.

    BTW... I have yet to foul a Denso IXU27... how about the rest of you who are running them?

    Jeff
    Thanks for the info Jeff. I have an RXP-X with 10 hours on it the motor sounds louder (running rougher), seems to vibrate more, and is only spinning 7800 when it usually runs 8100+ easy. It is also down on power a bit too.

    I'm thinking (and hoping) it could be fouled plug/plugs.

  6. #6
    Wouldn't you be down more RPM than that if you're losing a cylinder? I mean a plug is either firing or it isn't right? Checking the plugs wouldn't hurt though, but I wouldn't think that's the problem???


    I have 77hours on my stock plugs. Never been changed and have gone through 3 winters. I'll be switching to the IXU27 as soon as I add more boost.

  7. #7
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    Quote Originally Posted by RXP-REX View Post
    Wouldn't you be down more RPM than that if you're losing a cylinder? I mean a plug is either firing or it isn't right? Checking the plugs wouldn't hurt though, but I wouldn't think that's the problem???


    I have 77hours on my stock plugs. Never been changed and have gone through 3 winters. I'll be switching to the IXU27 as soon as I add more boost.

    Yeah, I wouldn't think so either. I'm just looking for a solution...

  8. #8
    Oh yeah, I totally understand that. Like I said, check'em it can't hurt. One more thing to rule out.

  9. #9
    Gotta love this sport! 05Limited's Avatar
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    Quote Originally Posted by RXP-REX View Post
    ... I have 77hours on my stock plugs. Never been changed and have gone through 3 winters...
    Rex... something tells me you maintain your ski properly and even start it once in a while over the winter

  10. #10
    Quote Originally Posted by 05Limited View Post
    Rex... something tells me you maintain your ski properly and even start it once in a while over the winter
    Nope. Don't even touch it from the middle of September to the start of May. Just follow the winterization instructions along with general maintenance and care over the course of the year. I've never even pulled the plugs and cleaned them! Thing fires up first try every spring. I've never been more pleased with a toy. This ski really has treated me well.

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