Harley Davidson Exhaust Popping

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Harley davidson exhaust popping. For older Magnetti Marelli fuel injected bikes adjusting the fuel table to remove fuel can help reduce popping. Ever since Cobra introduced the 909 slip ons they have been getting requests for a version that aligns perfectly with the bags. Popping is basically caused by a leak in the exhaust system possibly at the head pipe or at a joint in the system that draws in air.

The HD ECM does not shut off fuel on decel so there is some uncombusted fuel that hits the hot baffles in the muffler and burns off causing the popping. Expert Gear Advice From Riders. Exhaust leaks can cause decel pop make sure the exhaust is sealed completely at the motor and at any other connections.

Check the slip-on connections and also where the header joins the cylinder. It is also necessary that the exhaust system have rather open mufflers. Loosen and retighten the nuts holding it together at the cylinder head exhaust port.

Timing even slightly retarded will also greatly contribute to this popping. In fact one should expect a well-tuned high performance engine to pop and crackle when the throttle is closed at high rpm. Just pull it off check the gasketif its worn at all replace but most often its fine.

Agreed you should check the muffler to header joint as well as the exhaust flange nut but even if tight you will still get the decel pop. All exhaust popping or backfiring on a Harley-Davidson motorcycle is caused by fuel combustion in the exhaust manifold or the header pipes. When your exhaust valve opens after cylinder fires there is a flame present at exhaust valve.

The engine backfire on deceleration is also caused by the too lean airfuel ratio - A lot of people think that the backfirepopping in the exhaust is caused by too rich mixture but its actually the other way round. When any unburnt fuel exits the cylinder like on decel the air that can leak into the system will cause the mixture in the system to ignite causing a pop. I kind of like the sound on my bike even though it is muffled a bit.