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.

Harley davidson exhaust popping. In fact one should expect a well-tuned high performance engine to pop and crackle when the throttle is closed at high rpm. Ad Fast Free Shipping on Orders Over 40. Ever since Cobra introduced the 909 slip ons they have been getting requests for a version that aligns perfectly with the bags.

Exhaust leaks can cause decel pop make sure the exhaust is sealed completely at the motor and at any other connections. Generally speaking it may be caused by a an exhaust manifold leak. It is also necessary that the exhaust system have rather open mufflers.

Ad Fast Free Shipping on Orders Over 40. 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. If your spitting popping and having trouble keeping the engine turning at idle you most likely have a slip of the gasket on your t-pipe that connects the carb to the engine.

Ways to reduce and possibly eliminate this popping are listed below and can vary between Harley-Davidson motorcycles and others. Loosen and retighten the nuts holding it together at the cylinder head exhaust port. 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.

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. During backfires unburnt fuel goes out through the exhaust valve on deceleration. Check the slip-on connections and also where the header joins the cylinder.

Depending on the cam you run also has a effect on popping when decelerating. Popping on a Harley is not uncommon and many riders rather enjoy the light popping. Just pull it off check the gasketif its worn at all replace but most often its fine.