Can my Yamaha Star Bolt have worn out its spark plugs after only 3,000 miles?

Not the most serious question. I do intend to buy replacements plugs today anyway. 2015 Yamaha Star Bolt. Purchased new. Just crossed 3,000 miles (I have two other motorcycles that I ride more often). Was riding up a hill and it started exhibiting the symptoms of having bad spark plugs. Spitting and hiccuping. Rode back down and went straight to the local gas station to top it off with some fresh 93 octane. Took half a tank. Problem was still there.

This Yamaha does have an old fashioned air cooled motor. I'm used to liquid cooled bikes that go 20,000, or more, miles between spark plug changes. Has this bike taken me back to a time when I used to change plugs every 3,000 miles? Bad old days. My first bike was a 1975 Suzuki GT380.

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  • Carson
    Lv 6
    5 months ago
    Best answer

    It's a 4 yr old plug, age can matter It takes 5 min to pull, clean, gap(if it is not platinum) install. Or just go big and buy a spare.

    It could have also got condensation in the tank from sitting. Put a qtr bottle of HEET in the tank.

    • Lv 5
      5 months agoReport

      5 min in most Vee-twins, Yes. Takes longer in some where U have to remove seat and tank.

  • Anonymous
    5 months ago

    No. Plugs don't wear out in 20,000. You may have fouled them or bad gas or wrong heat range.

    I replaced a few in an air-cooled Honda after20,000, not worn nor fouled, but I like you had a problem, so I changed them. Turned out to be rusty tank and crud in carbs. I sandblasted the old ones, good as new. Keep as spares.

  • 5 months ago

    I doubt the plugs are bad.

    If you know the history of the bike, then chances are the plugs are the correct grade. It's nothing to do with being aircooled or not; Old skool two-strokes used to foul/oil plugs when used around town, but every four-stroke bike I've ever owned going back to a 1978 GS1000 has never had problems with plugs. Four bangers don't burn oil and the only way they can foul is if you use gas with too much lead on a plug that's too cold for the engine. Generally four strokes get their plugs good and hot and it's not a problem otherwise. As your bike seems to get little use, I'm going with water-contaminated fuel or maybe some sediment/rust/dirt. Flush out the carbie floats and fill it up with fresh gas.

    • Lv 5
      5 months agoReport

      Star is a vee twin.

  • The term 'worn out' is not quite accurate, but they could be in need of replacement. The truth is that motorcycle ignitions are crap by automotive standards. Plugs in cars can last 100k miles, it's because they are connected to an energetic ignition system that can still easily push a spark across huge gaps across electrodes rounded over by 10's of thousands of miles. Motorcycle ignitions are so anemic that they struggle with much smaller gaps, and need plugs with relatively crisp edges to help that little wispy spark make the jump. There are no motorcycles with 100k mile spark plug replacement schedules, most come no where near what cars have.

    • Lv 5
      5 months agoReport

      In fact. Harley ignitions will arc over and short out if run without plugs. U are suppose to short the outputs to ground when cranking w/no plugs.

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  • 5 months ago

    If you run E-fuel and the bike sat for a period of time than the fuel is sh!t. The E starts to turn itself back into corn where it came from.

    Source(s): Riding/racing for 55+ yrs.
  • 5 months ago

    Ah... the random replacement method rides again... and I love your premise that all new plugs are perfect... but it's a relatively cheap fix, and if it doesn't work you can save 'em for later. I would be more inclined to drain the tank through a clean cloth to see what's in the gas, blow out the fuel lines, pull and clean the finger strainers and maybe add aftermarket fuel filters.

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