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Ironhead Sportster Motorcycle Talk (1957-1985) For all those that wanna talk about Ironhead Sportster Motorcycles

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  #41  
Old 1 Week Ago
ryder rick ryder rick is offline
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Quote:
Originally Posted by Ferrous Head View Post
That's what I run in mt race engines Rick.

Possibly a bit cold for a street engine. I'd probably go 10.
I'd use an NGK6? :>)
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Ferrous Head Ferrous Head is offline
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You have to be careful with heat ranges. Some brands the higher the number the hotter the plug, others the higher the number the colder the plug.

Once you start modifying engines things can change. At the end of the day and engine wants what it wants.

There can be big differences in what's happening inside your combustion chamber depending on where you live/ride and the time of year etc.

What works perfectly for someone in Miami on a got summers day will be different to Iron Mick's experience up in Canada on a winters day just near the peak of Mt Warning.
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