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Thread: Plugs for 300x

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    Plugs for 300x

    I saw on a previous thread where some are using the NGK BR8IX and NGK BR8HS for 3L motors. Is this a sub. for the 300x motors? I am using the Champion QL77PP now with a rough idle and low end. Any idea if the NGK would help?
    Thanks..

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    I have never been a fan of Champion plugs but the X motors have been quirky when I have run anything else in them.

    Joe

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    Seems like you have to check the gap on any plug you buy now. Had a 300xs i worked on that was running bad and discovered the gaps were all over the place. Owner had not checked them before installing himself. I set gaps properly, and it ran fine. jm2cts

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    Sorry, double post
    Go Time
    2003XS GS 225 Promax
    26 Regulator twin 250 EFI

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    The QL77PP have always run the best for us in the X motors. And we run them hard.
    Go Time
    2003XS GS 225 Promax
    26 Regulator twin 250 EFI

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    Quote Originally Posted by JPEROG View Post
    I have never been a fan of Champion plugs but the X motors have been quirky when I have run anything else in them.

    Joe

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    Quote Originally Posted by Go Time View Post
    The QL77PP have always run the best for us in the X motors. And we run them hard.
    Where do you gap them? Factory spec or something else?
    2001 Spectre 30 w/twin 300X
    2008 Velocity 390SS w/twin staggered 525efi - sold
    2003 Sonic 31SS w/twin 496HO - sold
    1988 Baja Sunsport 196 w/500HP SBC and 125 shot nitrous - sold

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    There was a service bulletin on them concerning plug gap. I dont have it in front of me, but I seem to remember it was increased to .040... someone will chime in if thats wrong.
    Go Time
    2003XS GS 225 Promax
    26 Regulator twin 250 EFI

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    2001-03 APRIL 2001
    Printed in U.S.A. -

    2001, Mercury Marine
    Page 1 of 1
    No. 2001-03
    WARRANTY INFORMATION
    SERVICE INFORMATION
    Correct Spark Plug Gap for 300X Pro Max
    Models
    All 2001 Model Year 300X Pro Max Engines
    Situation
    The spark plug gap specification is incorrect on the emissions sticker attached to the engine
    and in the Operation, Maintenance and Warranty Manual. The incorrect gap is 0.035 in.
    (0.89 mm), which is too wide.
    Correction
    The correct spark plug gap for the 300 X Pro Max is 0.025 in. (0.64 mm). When checking
    or installing spark plugs, set the gap at 0.025 in. (0.64 mm)

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    Thanks, that is some good info..

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  13. #11
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    Quote Originally Posted by Go Time View Post
    There was a service bulletin on them concerning plug gap. I dont have it in front of me, but I seem to remember it was increased to .040... someone will chime in if thats wrong.
    Beware when gapping a PP. Easy to break off the platnum wafer.

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    Br8hs work fine, I wouldn't put champions in a lawn mower! If u run it hard for long periods run the br9hs, I usually gap them to .028-.030. u can use the br8hix, more expensive and an iridium plug.
    action mobile marine, 772 528 0754, dealers for aces fuel products,wolf efi, pro marine,latham and gaffrig/livorsi. we build gearcases and modify them(3 litre) to ratchet, and powerheads as well. 21 skater/3 litre wolf efi 113 mph the engine build http://www.screamandfly.com/showthre...-3-litre-build

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