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

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  #21  
Old 3 Weeks Ago
cazz1000 cazz1000 is offline
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ok, ok ureaka # 2 cam that holds the gold cup,,, there was play in the notcth,,, not much but just enough ,, had to fk with it,, just right of the middle,,, the timing plate looks normal,, me happy,,, set her at 40 degrees.. 3rd gear from 25 to 60 is awesome,,, 4th gear feels,, like over,drive really,, never ran 40 degrees,, with the ultima,, any thoughts on running the ult iggy at true 40 degrees,, curve 1,,,,,,next saga,,, cazz blow,s it up,,again,,,went down 1/4 turn on the super b,,,,, im 1 turn out,,, from seated,,, always ran1 1/14 to 1/1/2, upped the idle to 1050,,, ran old plugs autolite 4123,s,, just checked the plugs,, nice brown ,,,,, thet were black before,,,,,same plugs,,
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Read the tuning instructions from S&S on setting the idle air mixture, forget about counting turns, start from scratch and follow the instructions, then tell us how it runs? Does this bike have a flat spot right off idle? Super B's are famous for that.
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I'll guess that a B is the same as an E or G and advise that the idle mix screw is very sensitive. 1/8 turn is a significant change.

Get the oil tank hot, not warm - hot. And set it to lean best, that is in until it stumbles then out til it is smooth. Set hot idle a little fast so it's a little happier when cold. Reset ldle mix after making any speed adjustments.

Setting the carb cold, oil tank not hot will usually result in blackened plugs.

This is your baseline, make any other adjustments from this point but don't let it get too rich, it will contaminate the oil with fuel. An S&S carb runs Mainly on the low speed part and the idle is a big part of that.
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