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post #1 of 9 (permalink) Old 09-04-2009, 12:45 PM Thread Starter
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How often do you change sparkplugs?

Hey Gang,
My 2007 Bonneville seems to be running a little "tired" lately...Not as peppy and she seems to have lost a little on the top end. I havent checked the spark plugs yet but was thinking with 8400 miles on the original plugs it was time to probably change them...
Approximately, what mileage is everyone changing theirs?
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post #2 of 9 (permalink) Old 09-04-2009, 01:46 PM
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i might be wrong, as i am too lazy to check right now, but i am thinking it's recommended to change the plugs during the 12k serivce...

'07 Thruxton, Caspian Blue Checker, FCR's, 813 cams, Pieman ignitor, Predators, ported & polished head...
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post #3 of 9 (permalink) Old 09-04-2009, 01:51 PM
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Recommended service interval is indeed 12K miles, and I see no reason to do it more frequently. The plugs looked fine on mine at 12K, current set running just dandy.

Before he did it, I'd have said it couldn't be done.
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post #4 of 9 (permalink) Old 09-04-2009, 02:07 PM
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You might want to try alittle seafoam in the gas tank,thats what I did last nite. Worst that can happen is you clean your carbs
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post #5 of 9 (permalink) Old 09-04-2009, 04:58 PM
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I think this will depend on how you add up those miles. If you're bopping around town at 35mph, your plugs will last alot longer than if you're on long road trips with consistent high speeds (80mph+).

I change mine roughly every 7,000 miles. They're usually not that bad when I pull them, but they're $2.50 a piece?! Why not have fresh ones as often as possible?
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post #6 of 9 (permalink) Old 09-04-2009, 06:01 PM
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All right. Called for @ 12000 mi service. BUT @ $2/ ea- change them when ya want. Dont waaste the $ in the iridiums! I did mine for the hell of it @ 7000 mi & they were perfect! Gap, color everything!

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post #7 of 9 (permalink) Old 09-05-2009, 03:44 AM
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And ....

When you do change them ... side gap them and get better burning of the fuel charge.
Also, if you orient the plug so the gap is facing the inlet port, it's even better ...


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post #8 of 9 (permalink) Old 09-05-2009, 01:42 PM
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the parts guy told me, Triumph oil is good for about 6k miles. so, i change the plugs then...with every oil change
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post #9 of 9 (permalink) Old 09-05-2009, 07:25 PM
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I noticed my stock NGK's were ready to be replaced at 10,000 miles.

A new air filter made the biggest change in rejuvenating my bike's performance though.
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