Yamaha F150 spark plugs?

  • kroger3
    blaine mn
    Posts: 1116
    March 3, 2014 at 4:49 pm #1355631

    Replacing plugs on my Yamaha F150 and yamaha says use NGK LFR6A-11 and NGK’s site says NGK LFR5A-11. So NGK reccomends a hotter plug then Yamaha does…. Motor had the 5s in it but have been done in the past but not by me.

    Next heat range must not matter? Anyone have input? Have new 5s in hand and about to put them in and im not a big fan of running whats not to spec.

    llong
    Posts: 197
    March 3, 2014 at 4:56 pm #1393447

    Wouldn’t be the first time a manual was wrong. Same thing on my dads optimax, book said one kind of plug and should be another one. Service tech figured it out from la Cannes in faribault

    onestout
    Hudson, WI
    Posts: 2698
    March 3, 2014 at 5:03 pm #1393451

    Read the plugs that are in it now to see if you need a hotter or colder plug, that would be the best way.

    kroger3
    blaine mn
    Posts: 1116
    March 3, 2014 at 5:14 pm #1393459

    Plugs look great i just like to change them every spring.

    Just looked around more under the cover of the motor and there is a sticker saying to run the 5s gapped at .044

    Weird how Yamahas website says different.

    Bryan Myers
    Moderator
    Posts: 586
    March 3, 2014 at 6:09 pm #1393470

    I just ran out to the garage to grab a spec book for Yamaha’s and in print in both books I checked call for the LFR5A-11 gapped at .039~.043″ and that is what I have always put in them. If it looks like the 5s you pulled out are burning fine stick with them. It’s always nice to hear about guys doing preventive maintenance before it causes a problem!

    rvvrrat
    The Sand Prairie
    Posts: 1840
    March 4, 2014 at 5:15 am #1393530

    Quote:

    Plugs look great i just like to change them every spring.

    I used to that every spring too. When I bought a new F115 a couple of years ago the dealer’s tech/mechanic told me to run the factory installed plugs until I noticed any problem.

    kroger3
    blaine mn
    Posts: 1116
    March 4, 2014 at 7:44 am #1393557

    Quote:

    Quote:

    Plugs look great i just like to change them every spring.

    I used to that every spring too. When I bought a new F115 a couple of years ago the dealer’s tech/mechanic told me to run the factory installed plugs until I noticed any problem.

    Im sure I could go several years but its just part of my routine and new to the F150 this year so was curious on the plug type. Plugs, water impeller, water impeller housing gasket, lower unit drain plug screw gaskets, and crankcase drain plug gasket are all an every year deal for me.

    Over the top? Yes! But its a cheap piece of mind!

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