loud backfire / explosion on startup
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5th Gear
Joined: Dec 2018
Posts: 9
Likes: 1
From: Seattle, WA
loud backfire / explosion on startup
I have a 2003 Road King EFI that has a high flow air filter, V&H true duals with oval slipons, a S&S 510G cam, and a V&H Fuelpak. Since putting on the true duals about a year ago, I occasionally get a really loud "bang" backfire or small explosion when starting the bike. Not always, but frequently enough to be a concern. Usually happens when the bike is cold and has been on the side stand for a while, but it's also occasionally happened with a warm engine. Other than that, the bike runs great. Any thoughts as to what's causing this? Thanks in advance.
Thread Starter
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5th Gear
Joined: Dec 2018
Posts: 9
Likes: 1
From: Seattle, WA
I did retune per the V&H web site and also contact them and they had me adjust a couple of numbers. I have the old school LED Fuelpak, so no autotune. Just bought a Power Commander V. Hoping that fixes things. Just concerned that fuel is leaking by something.
Elite HDF Member
Joined: May 2007
Posts: 4,452
Likes: 798
From: Bear Flag, lower end
My 04 RK does that occasionally, I have a PC3 with stage one and 510G cams. Maybe happened 15 times in 75,000 miles.
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