Thread: Spark Plug?
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Old 07-19-2012, 12:20 PM
KCvale KCvale is offline
Motorized Bicycle Elite Member
Join Date: Feb 2010
Location: Phoenix,AZ
Posts: 3,551
Default Re: Spark Plug?

From my web site:

The way I see it, it is all about how well the plug dissipates heat to the head.
Look at the size difference in the white insulator length where the plug threads are.

The more white you have in contact where the threads are, the more heat is transferred to the cooling fins, and the pink is just providing an air gap to keep heat in.

I would also have to argue that an air cooled motor dissipates much more heat much quicker in a freezing wind opposed to a frigg'n hot one.

Engine Speed and Load

* If the engine is to be operated at high RPM, under a heavy load, or at high temperatures for long periods a colder heat range may be needed.
* Conversely, if the engine is to be operated at low speeds or at low temperatures for long periods, a hotter heat range might be needed to prevent fouling.

Ya, I do my homework and test so I know and then share and that particular topic is 2 years old and why I swear by the Iridium plugs, they really do make a difference I can actually feel.

Just pick the number that best suites how you ride and the temp conditions.
Granted it's not as pronounced a power gain as an expansion chamber but for $8 something you can actually feel.
KC's Krusiers Builds

Last edited by KCvale; 07-19-2012 at 12:32 PM.
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