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Rock in my Engine

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Old Jun 25, 2008 | 12:56 PM
  #1  
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psmith007
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Default Rock in my Engine

I have a 2008 street bob.&nbsp\\; I have about 1700 miles on it so far.&nbsp\\; My question to you is this—when I put the bike in 5th or 6th gear and give it the gas, sometimes it sounds like there are rocks in the engine banging around.&nbsp\\; This only happens when I pull the throttle back fast.&nbsp\\; Does anyone have an idea what this may be and if so should I have it looked at?
 
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Old Jun 25, 2008 | 01:00 PM
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From: By the "Betty water and the Wire"
Default RE: Rock in my Engine

Could it be spark knock?
You running good gas in it?
 
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Old Jun 25, 2008 | 01:14 PM
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Default RE: Rock in my Engine

Ya 92octane
 
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Old Jun 25, 2008 | 01:52 PM
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Default RE: Rock in my Engine

Sounds like you might be shifting too soon and don't maintain necessary RPM's following the shift for hard acceleration.
 
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Old Jun 25, 2008 | 01:53 PM
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Default RE: Rock in my Engine

Could you possibly be twisting the wick when your engine was already lagging....in other words, were you running at least 2000 RPM before you opened the throttle??&nbsp\\;
&nbsp\\;
Ed
 
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Old Jun 25, 2008 | 03:37 PM
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wrenchbendr
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Default RE: Rock in my Engine

yeah my fatbob sounds like that also when you roll on the throttle in sixth and the revs are a little low.&nbsp\\; seems to have gotten better with miles though.
 
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Old Jun 25, 2008 | 03:39 PM
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Default RE: Rock in my Engine

You are lugging the engine. Not good for it. Get the revs up. I keep mine at 2300&gt\\;
 
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Old Jun 25, 2008 | 06:20 PM
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Default RE: Rock in my Engine

Don't shift to 6th below 60 MPH. You're lugging it. Piston rattle is hard on motors.
 
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Old Jun 25, 2008 | 06:32 PM
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Default RE: Rock in my Engine

your all fkn nuts....I can shift into 6th at 45.....NO NOISE NO RATTLES..I can run it as low as 1500rpm in 6th without any noise.
its a stroker motor ffs designed for high torque and low rpm.....dont believe the harley bs about lugging it...its just about them saving there own *** so they dont have to replace your sub standard crank
 
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Old Jun 25, 2008 | 06:33 PM
  #10  
Major Woodie's Avatar
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Default RE: Rock in my Engine

+1 on the shifting too soon. That's&nbsp\\; the problem.&nbsp\\; I wasn't used to the extra gears and learned that lesson too.&nbsp\\; Also as a couple other posts mentioned...never shift to 6th unless your doing at least 60 mph.&nbsp\\; Crusing at 65mph or higher works best for 6th from what I'm seeing.
 
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