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

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  #11  
Old 7th October 2014
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fdny37 fdny37 is offline
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If you are not stroking it don't get too crazy. Head work and bigger valves will wake it up but you're not going to break any records.


http://valvetrain.kpmivalvetrain.com...r-1970-to-1983
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  #12  
Old 7th October 2014
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No, there isn't any issue with the plug going straight down as the electrode tip is still positioned opposite the original plug. Makes the rear plug a little difficult to change (I had to make a special tool to access it with everything installed). With the dual plugs, you can back off the timing since you're getting a more complete burn of the mixture. I figure I'm running around 35 degrees of advance at this point.

Eric

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  #13  
Old 7th October 2014
Metalgrinder Metalgrinder is offline
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I was planning on stroking it later down the road when I have to do the bottom end.Should I just run cast pistons until then? Eric isn't the point of dual pluggin the head so you can run MORE timing? retarded timing equals less horsepower from my experience.
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