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Rattle when Hard excellerating

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Old Aug 8, 2010 | 02:23 PM
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Default Rattle when Hard excellerating

my 2009 FLHTP (103 cu. in.) makes a rattle that sounds like it is coming from the front rocker box, but I can't be sure at all.

(for one thing, my hearing is about shot to hell) - it almost sounds like something rattling, but its brief, only making the noise when I first roll back on the throttle.

I thought maybe it was just engine ping, but I use 91 octane (highest around here) and rans 6 ozs of Seafoam through the tank with no real change.

does anyone have any thoughts? I don't know a lot about what is in the rocker box, but I'm not against finding out if thats the problem...

thanks
 

Last edited by deanp1964; Aug 9, 2010 at 07:34 AM. Reason: excelleratin' = accelerating (thanks for tech support mr arrow)
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Old Aug 8, 2010 | 03:26 PM
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Top motor mount ?
 
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Old Aug 8, 2010 | 05:03 PM
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Originally Posted by Captain Itch
Top motor mount ?
Just checked the top motor mount and its tight - thanks for the suggestion though Captain
 
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Old Aug 8, 2010 | 05:17 PM
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My first thought is the same as yours, OP. Try a bottle of octane boost instead of the seafoam.
 
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Old Aug 8, 2010 | 06:07 PM
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If it only does it on hard accel, I think it is a timing issue rather than octane. The timing is advanced too far and needs to be retarded in those power bands.

Bwana
 
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Old Aug 8, 2010 | 06:54 PM
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My guess would be the compensator. I changed mine yesterday for the SE version. Major reduction in perceived engine noise.
 

Last edited by nemick; Aug 8, 2010 at 08:30 PM.
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Old Aug 8, 2010 | 07:00 PM
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did ya check the bottom motor mount. my bike did the same thing thought it was the top and it turned out o be the bottom one.
 
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Old Aug 8, 2010 | 07:32 PM
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Run excellerating by encarta and maybe that will give you a clue....
 
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Old Aug 9, 2010 | 07:36 AM
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thanks guys, a few more things for me to check out/consider.
I'm not sure if I understand how the compensator affects this rattle tho - can you expand on that a little?

I do have Fuel Moto stage one & PCV on the bike, by the way.
 
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Old Aug 9, 2010 | 08:07 AM
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fyi...the compensator nut does not ping or rattle, it knocks.

Bwana
 
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