I need HELP!
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Cruiser
Joined: Oct 2007
Posts: 110
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I need HELP!
I have a 08 Fatbob with 6000 miles on it. About a month ago it started making a "tinging" noise that sounds like pea gravel hitting the tank. It only occurs when I crack the throttle wide open, it doesn't matter what gear I'm in or what RPM I'm at. The bike doesn't stumble or hesitate when the sound occurs. When it started doing it my bike was stock except for having Rush slip-ons and Nightriders Xieds, both of which were installed a year ago. I took the Xieds off and there was no difference. Since I was already scheduled to have my dealer install a SE air cleaner and SEST and do a dyno tune, I left the Xieds off and had the install and tune done. My dealer thought the SEST may fix the problem. Again, no difference. They retarded the timing twice, and re-tuned the bike, still no change. They can't hear the sound when the bike is on the dyno (too noisy), only when it's on the road. They went thru all of the exhaust connections. They also opened up the primary and checked it out. It's been in the shop for the last 9 days and they still have no idea where it's coming from.
Any help would be greatly appreciated!
Any help would be greatly appreciated!
Tourer
Joined: Jun 2007
Posts: 344
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i get it too on very hot days riding two up. Got real bad on ride when the only gas was 89 octane. bike did not like that!!! I have started researching this lately, seems alot of guys on forum have similar stories. I am going to hook my sert up and go give it hell on the road to see where it might be doing it. I put 93 octane in and the weatherhas cooled off and doesn't do it. Maybe your tuner is bad???
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Cruiser
Joined: Oct 2007
Posts: 110
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My dealer assured me that if it was pinging, retarding the timing would have helped. Since it didn't help he concluded it wasn't pinging. I've also heard that regular use of an octane booster will have negative effects?
Outstanding HDF Member
Joined: Sep 2007
Posts: 3,074
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From:
It is pre ignition from hot cylinder causing a ping they prob can not retard the timing enough to make it go away nor would you want them to. I did not say to regularly use octane boost just try it once and see if noise goes away if it does its pre ignition if it does not you then may have another problem.
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Cruiser
Joined: Oct 2007
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Cruiser
Joined: Apr 2009
Posts: 141
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From: Central Maine
Well this is interesting. I have heard the same thing on my 09 Fat Bob, just the way you describe it. I never thought much about it because it does not do it very often and only for a couple seconds when it does and then I may go a few weeks with out hearing it again. Your description is perfect it does sound like small bits of gravel hitting the gas tank. The first time it did it I thought "what the heck is that? There is no dirt on the road here." Then I never heard it again for a while. I'll be watching this thread to see if anyone knows for sure what this is.
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Road Warrior
Joined: Sep 2006
Posts: 1,570
Likes: 45
yup... ive been trying to fix this for a year now. ive tried colder plugs, switching pipes and ac back to stock etc. it still did it. i finaly tuned it out with the tts mastertune. i upped the
clb table, the power enrich(pumpshot)table and retarded timing 3 deg in the 80-100 kpa
range. Now it has finaly stoped PINGING!!!!!!
clb table, the power enrich(pumpshot)table and retarded timing 3 deg in the 80-100 kpa
range. Now it has finaly stoped PINGING!!!!!!
Supporter
Joined: Jan 2007
Posts: 15,788
Likes: 5,640
From: along the shore of Mishigami
There could be a little piece of carbon in the combustion chamber glowing red hot and predetonating the fuel charge, try running some seafoam or Techron fuel additive, that might chase out the carbon.