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

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  #1  
Old 3rd June 2015
Kickflippin Kickflippin is offline
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Default '76 Stroker Flywheel balance

My project came with an S&S 74" flywheel kit already installed in the case. From sitting it has some surface rust on the wheel but the motion is still very smooth. I've scrubbed with a mild brush and flushed out with ATF then motor oil. Rolls through the stroke with the jugs and heads on just fine.

I'm still nervous about how balanced it may or may not be from sitting and being bumped around a shop for the last 5 years.

Is there a way to test balance without splitting the cases?

And, what is the general thought on light surface rust on flywheels and crank arms? Thanks.

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  #2  
Old 3rd June 2015
Kickflippin Kickflippin is offline
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Default

Also should mention the jugs have been notched to allow the stroke and the oil lines have been moved/extended. Whoever installed it originally did a good job.
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Old 4th June 2015
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you could check pinion and sprocket shaft runout, but if, as you say, the wheels came installed in the cases, i don't think you have much to worry about.
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You seem to be confusing balance with flywheel truing. Balance is done by adding or subtracting weight from the rotating assembly. On your bike, this means either drilling out material from the wheels or adding Mallory metal to them. Unless you have done something to remove a fair amount of metal from the wheels or rods, you should be fine.

Trueness is another story. It is unlikely your wheels are out of true, but it does not hurt to check. Attach a dial indicator to the cases, and measure the pinion and sprocket shaft run out as DDM suggests. Post your numbers here and we will all help.
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