A spark plug is a device that delivers electric current from the ignition to the combustion chamber of an engine to ignite the compressed mixture of air and fuel. All motorcycles, including those from ...

If you hear a popping or cracking sound coming from your Harley motorcycle, more than likely it's backfiring. Here are five reasons this is happening.

With the spark plugs positioned 180 degrees from each other, each of the two pistons fire on every-other revolution to produce an exhaust noise that is even, smooth and balanced.

Harley-Davidson's factory warranty does not cover consumable parts and items like batteries, tires, drive belts or chains, filters, spark plugs, paint chips, and fluids.

Harley-Davidson Spark is the name of a modified 2009 Night Rod Special handled by a Lithuanian shop called Tommy and Sons ...

Until now. Enter the Harley LiveWire – a prototype electric motorcycle, but unquestionably one that is headed to market (widely rumoured by 2020).

Once at the Toledo Harley-Davidson dealer, we explained our situation. It was near closing, no other customers were there and we got diagnosed quickly — a fouled out spark plug, which was the ...

Riders have been warned to be on the lookout for fake NGK CR9EIX spark plugs which could cause engine damage due to melted centre electrodes.

This week, Harley-Davidson Inc (NYSE: HOG) announced it plans to have a fully electric motorcycle on the market within 18 months, but investors weren’t particularly impressed by the news.

Sampey is a Harley-Davidson Screamin’ Eagle/Vance & Hines team rider, and last weekend took to the 1/4 mile at the Denso Spark Plugs NHRA U.S. Nationals at the Lucas Oil Raceway in Indianapolis ...