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Discussion Starter #1
My dad just bought a 1987 sportster and he loves it, the only problem is after approx 10 miles it starts to make a piston slap noise and has a miss. If he lets it set for about 5 minutes it quits doing it? Any ideas on what to check or where to start? thanks
 

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STAND AND FIGHT!
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Since the bike is a new purchase, but older bike,
maybe he hasn't changed the oil yet?
And the previous owner had let it go so long it's beat?

Could the oil be thinning out when it gets hot enough to let the lifters collapse?
 

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Discussion Starter #3
He is going to take a look at the pushrods and see if that is the problem. We kind of thought maybe that was the problem. Thanks for the help so far, but any more help is greatly appreciated. I will let you know what he finds out.
 
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