Harley Davidson Exhaust Popping

For older Magnetti Marelli fuel injected bikes adjusting the fuel table to remove fuel can help reduce popping.

Harley davidson exhaust popping. 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. During backfires unburnt fuel goes out through the exhaust valve on deceleration. Popping on a Harley is not uncommon and many riders rather enjoy the light popping.

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. Check the slip-on connections and also where the header joins the cylinder. For older Magnetti Marelli fuel injected bikes adjusting the fuel table to remove fuel can help reduce popping.

The popping is caused by unspent gas building up in the cylinder or within the exhaust header on decel and then finally the heat or spark will set it off. Loosen and retighten the nuts holding it together at the cylinder head exhaust port. Just pull it off check the gasketif its worn at all replace but most often its fine.

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. Exhaust leaks can cause decel pop make sure the exhaust is sealed completely at the motor and at any other connections. Cobra 909 Uppercut Slip On Harley Davidson Exhaust.

The popping is a result of the airfuel mixture becoming very lean when the throttle is closed and the engine is rotating well above idle speed. Vance Hines Titan 450 Slip On Harley Davidson Exhaust. Unknown June 4 2017 at 703 AM.

In fact one should expect a well-tuned high performance engine to pop and crackle when the throttle is closed at high rpm. All exhaust popping or backfiring on a Harley-Davidson motorcycle is caused by fuel combustion in the exhaust manifold or the header pipes. When the Harley is backfiring with the stock exhaust system still intact it might signal the exhaust pipe weakening or the muffler is malfunctioning.