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Thread: Spark Plugs

  1. #1
    Phil's Avatar
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    Spark Plugs

    What are the best spark plugs for the 250 and where is the best place to buy them?


  2. #2

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    i have 19 hrs. on mine and the plugs have fouled out already!

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    Phil's Avatar
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    They offer 3 different plugs! Which one is the correct plug?

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    The "correct" one is the one that came in your 250X.... The PMR9B. The others will work as well according to NGK. I would chose what is in the ski. If you need them immediately and can't get the PMR9B then use the cheaper plug while you are waiting for the right ones to arrive.

    Curtis

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    Quote Originally Posted by cue03 View Post
    The "correct" one is the one that came in your 250X.... The PMR9B. The others will work as well according to NGK. I would chose what is in the ski. If you need them immediately and can't get the PMR9B then use the cheaper plug while you are waiting for the right ones to arrive.

    Curtis
    PMR9B is the NGK that is in your machine stock. However the other 2 are also the "correct" plugs. They are just different metals and have different ratings. Example: just because my Ford truck comes with a cheap OEM plug doesnt mean I cant change it out for a different brand as long as it is designed for your model it will work. The only time you really need to be concerned is when you are racing and using differnt race fuels , mods and need different heat ranges on your plugs.

    There are several different plug manufactures out there. Right now the only one that makes the plugs for the ULTRA is NGK. So if NGK is offering 3 different plugs for the Ultra then you can use them on your Ultra.

    Double Platnum is a more expensive metal than Iridum so its a more expensive plug. They both have premimun ratings. I ve used Iridium on my Autos and ATV's without a problem. I am planing on getting Iridiums for my Ultra.

    Quote from NGK "Iridium is a precious metal that is 6 times harder and 8 times stronger than platinum, it has a 1,200(=F) higher melting point than platinum and conducts electricity better. "

    Rest my case.

  7. #7
    TheBaron's Avatar
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    Oh yeah. One more thing. If using a diffent plug that is "designed for your machine will void your warranty" then NGK would say so. Or they would get sued if their plug killed your motor. Use your heads guys!

  8. #8
    What problems are you experiencing with fouled plugs. I have 39 Hours and I am getting max rpms around 7650-7780. Fuel mileage is averaging around 2.5 mpg.

  9. #9
    hilomikey's Avatar
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    Here's a stupid question

    If you use cheaper plugs, could ya use cheaper gas???

  10. #10

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    Quote Originally Posted by hilomikey View Post
    If you use cheaper plugs, could ya use cheaper gas???
    No, itís all about engine structure, not about spark plugs. So thatís why you need premium gas.

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