What is "piston slap", and what can silence it?
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Road Master
Joined: Oct 2008
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From: California
OF COURSE I was joking! I ride my bike every day to/from work. Could you really picture a guy outside every morning, holding a torch to his bike before starting it?
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Road Master
Joined: Oct 2008
Posts: 880
Likes: 81
From: California
I don't know... guess it's like the GM motors (i.e. 4.3L). Those things slap as they're being driven out of the factory. "Normal" according to GM (and HD).
Club Member
Joined: Jul 2008
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From: On a hill among the hills, PA
I figured as much but one never knows for sure with some of the questions I read about! Have a good one and a safe one... get that big bore kit ordered!!!
Cruiser
Joined: Nov 2006
Posts: 126
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From: CA
You should not have piston slap with a stock low mileage engine. Piston slap is common in worn out engines and forged piston engines. Forged pistons grow more when hot so they have to start with more clearance. I'd call HD customer service and start bitching, if you have slap with cast pistons then that engine is out of tolerance on the pistons/cylinders.
Elite HDF Member
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From: People's Republic of Boulder Colorado
The MOCO's half-assed QC in action. Whaddaya expect fer only $18,000? A high quality machine that's worth what ya paid for it? Yer dreamin'.
Road Warrior
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Road Warrior
Joined: Jun 2006
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There's a rule of thumb in piston to bore clearances, I'm not sure but I think it's like half a thousandth per inch of bore, maybe a little less. when it's correctly done , there is no pisto slap. Surely shouldn't be any on a new engine
Cruiser
Joined: Sep 2009
Posts: 125
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From: Rhode Island
Piston slap is not normal unless high mileage is involved. If truly piston slap I's try another dealer, I would believe it is the dealer who makes the call. If nothing else works write Harley a letter and ask them for assistance.
Keep us posted please!
Keep us posted please!