Deceleration sounds
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Cruiser
Joined: Nov 2010
Posts: 135
Likes: 1
From: Ottertail, MN
Deceleration sounds
I'm a new Harley owner and new to hdforums. I've put on about 1400 miles of light cruising in my first 2 months. Stored for the winter now, 12F for a high in Minnesota yesterday. My ride is a 2006 RKC, purchased in Sept with 6800 miles. It was improved by the former owner who gave me all the paperwork. It has Bassani dual exhaust, Screaming Eagle slip-on slash down pipes, stage 1 upgrades with an EFI race tuner kit, and was dyno tuned by the dealer. The before and after dyno run sheets show about a 9% increase in HP and torque. It runs great and is a thrill to ride, but being new to HD, I have a question: during deceration it really cackels and pops and even backfires on occasion. Is this normal? Also, in that 1400 miles fuel economy has been steady at about 33-35mpg. Most of this has been city driving and slow cruising, about 1/2 the time 2up with the wife along. I wasn't looking for economy when getting into a HD but I guess I was expecting better than this.
Thanks in advance for your replies.
Thanks in advance for your replies.
Ultimate HDF Member
Joined: Nov 2008
Posts: 6,682
Likes: 12
Sounds like it is lean at 0% throttle. You can take it to another dyno tuner and have them baseline the bike and they can tell you if they can tweek the tune to make it run better but should be able to get rid of the popping regardless. Before doing that, however, check all your exhaust connections and make sure they are snugged up good. If its sucking air in, that can cause the popping too.
Last edited by 1931jamesw; Nov 26, 2010 at 07:59 PM.
Seasoned HDF Member
Joined: Jun 2006
Posts: 28,577
Likes: 3,957
From: Vermont
Not normal. Your tune is probably off. Have it tuned by a reputable tuner that knows what they are doing. The only other thing that can cause noises are exhaust and/or intake leaks.
Stellar HDF Member
Joined: Jul 2010
Posts: 2,275
Likes: 241
From: Highlands, NJ
Gurgling is normal, especially if you're downshifting. Backfire....not normal. An occasional pop, maybe. Also what kind of fuel are you using? Run 93 octane. Like mentioned above. Check exhaust gaskets and exhaust connections before going to a tuner. Might save you a few bucks. Just caught the "Dynoed by a dealer".....Might want to go to a reputable tuner.
Last edited by FDHOG; Nov 26, 2010 at 08:46 PM.
Thread Starter
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Cruiser
Joined: Nov 2010
Posts: 135
Likes: 1
From: Ottertail, MN
I've mostly run 92 octane non-oxy gas. Gurgling and popping as you describe it might fit. Actual backfire popping only happens occasionally after getting on it hard and letting off or downnshifting rapidly. I likely don't have a problem but am a tech college instructor in the heavy diesel industry and backfire there normally indicates a problem.
thanks
thanks
Stellar HDF Member
Joined: Jul 2010
Posts: 2,275
Likes: 241
From: Highlands, NJ
Just hit about 1K on mine and I'm getting 37mpg combined with a 103 and a canned map. Getting it tuned next week.
Ask around and find a good tuner in your area. Preferrably one trained by Doc. It'll be worth it. Just because you got an HP increase, doesn't mean it's running right.
Ask around and find a good tuner in your area. Preferrably one trained by Doc. It'll be worth it. Just because you got an HP increase, doesn't mean it's running right.
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