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

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  #31  
Old 15th January 2020
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Quote:
Originally Posted by ryder rick View Post
And the rear piston is completely untouched?

More pictures would cut down on the questions.
I'd like to see the top of both pistons as well.

It's looking more and more to me like it got ran too long at a slow idle.
Are there any signs of heat inside the piston? (Pipes were not blue)
Rear piston top after brushing off some of the carbon:



Both piston tops:



Front of rear piston:



Front of front piston:



Rear of rear piston:



The skirt of the front (damaged) piston is somewhat smaller than the rear. I don't have the tools to measure accurately with, but it is smaller.
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  #32  
Old 16th January 2020
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I don't see any irregular heat indications on either piston. Actually doesn't show any heat.

I'd say from all indicators at this point it was slow idled and oil starved.
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  #33  
Old 16th January 2020
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saw that in a motor that sat idling too long in a traffic jam. Portland bike hahahaha
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  #34  
Old 16th January 2020
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on only one cylinder? i'm not ruling out an intake leak at the front o-ring.
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  #35  
Old 16th January 2020
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Originally Posted by jsandidge View Post
What causes piston slap anyway?
A lot of things cause, piston slap, most of reason's been stated in post's.. you can lessen piston slap a few different ways. one of them is to fit off set piston pin. S&S had cast off set pin pistons. I used a set in an old Shovel Stroker big twin. not sure if they make them for Iron Head Sporty's. just thought I'd mention.
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  #36  
Old 16th January 2020
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Aren't you worried about all the shit on the rags falling in the cases when you pull the rags out? If it were me, it would look a bit more like a surgical field to avoid that.
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Old 17th January 2020
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Originally Posted by GA_Ironhead View Post
Aren't you worried about all the shit on the rags falling in the cases when you pull the rags out?
Shop vac to the rescue!
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  #38  
Old 17th January 2020
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Originally Posted by GA_Ironhead View Post
Aren't you worried about all the shit on the rags falling in the cases when you pull the rags out? ...
Use only clean shop rags, installed carefully - and keep pets, visitors, children, inexperienced helpful adults, etc away from it.
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  #39  
Old 18th January 2020
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Never lost a child in there but I did have one dog go missing once while I was doing a 74 engine up.

Always wondered about that because the damn thing ran like a dog.
Blamed the carby for a long time.
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