Many Harley-Davidsons have two gas caps—one on each fuel tank—because early models used two smaller tanks instead of one large one for styling and balance, a tradition that continues today as a heritage feature.
Why do motorcycles have locking gas caps?
Locking gas caps on motorcycles primarily deter casual fuel theft and give owners a sense of added security.
They don’t stop a determined thief, but they do make siphoning harder. The lock uses a keyed cylinder, so you’ll need that extra step to remove it. Some riders swear by them for bikes parked in public or shared garages. For most touring bikes—especially Harleys—they’re more about feeling secure than bulletproof protection.
Do I need a vented gas cap motorcycle?
Yes—without a vented cap, rising fuel temperatures can build dangerous pressure, causing leaks or tank damage.
Vented caps let air flow in and out as fuel levels and temps shift. On bikes with two tanks, one cap is usually vented while the other isn’t (often the left-hand side). That setup prevents vacuum lock when you’re burning through fuel. Skip the venting, and you might face poor engine performance—or worse, fuel starvation when it’s hot out.
How do I know if my Harley gas cap is vented?
Look at the underside of the cap—the vented model will have a visible valve or small opening near the sealing surface.
Some Harley models have a tiny nipple or tube on the cap’s bottom. Check the owner’s manual too—vented caps often have part numbers like Harley-Davidson 64202-06A, while non-vented ones are 64202-06. If your tank vents through the filler neck, you’ll need a vented cap to keep pressure balanced.
Why does Harley Davidson have 2 names?
Harley-Davidson’s name order reflects the original founders: William Harley, Arthur Davidson, Walter Davidson, and William Davidson.
The "Harley" comes first because William Harley designed the first prototype engine in 1901. Arthur Davidson handled operations as the first general manager, while Walter Davidson took the president role. This naming order highlights Harley’s engineering roots and remains a trademark today.
What happens when you don’t properly vent a storage tank?
Improper venting can cause storage tanks to collapse inward under vacuum or rupture from excess pressure.
Without a working vent, fuel evaporation and temperature swings create pressure imbalances. Small tanks might struggle with fuel starvation or leaks. In extreme cases, large plastic tanks can even implode if pressure isn’t relieved. Always double-check that vents are clear—especially if you store your bike outside or in dusty conditions.
Does my Harley need a vented gas cap?
Yes—modern Harley-Davidson models require a vented gas cap to maintain proper fuel tank pressure and prevent vacuum lock.
Most Harley tanks vent through the filler neck, so the cap seals that path. Use a non-vented cap, and you risk starving the engine—especially at high RPMs or under load. Always match the cap to your tank’s design; vented models often use Harley part numbers like 64202-06A or 70042-08A.
How do you clean gas cap vents?
Use a soft-bristle brush—like a dedicated paintbrush or toothbrush—to clear debris from the vent passages without damaging the seal.
Skip the compressed air—it can push grime deeper into the mechanism. For stubborn gunk, a little isopropyl alcohol on the brush helps. Never use sharp tools or metal picks; they can widen the vent or scratch the sealing surface. Aim to clean vents every oil change or after dusty rides.
What is a pre vent gas cap?
A pre-vent gas cap releases tank pressure before the main seal lifts, preventing fuel spillage or sudden vacuum release during refueling.
These caps have a secondary valve that opens at a lower pressure, equalizing things before the main seal disengages. That reduces spills and protects the filler neck from pressure shock. You’ll find them on late-model bikes—including some Harley Touring models—to meet emissions standards.
Does Kawasaki own Harley-Davidson?
No—Kawasaki Motor Company is not the owner of Harley-Davidson as of 2026.
Harley-Davidson stays independent under its own corporate umbrella. Kawasaki, meanwhile, builds its own bikes under Kawasaki Heavy Industries. The two brands compete in cruisers and touring bikes but operate separately. Always verify ownership through official filings or press releases—don’t take rumors at face value.
What does Harley FLHR stand for?
FLHR stands for “Fat Low Road King,” a Harley-Davidson model designation.
The “FL” means it’s a touring frame with large saddlebags, while “HR” stands for “Highway Road.” The Road King’s known for its classic look, windshield, and smooth ride. Harley’s used this naming scheme since the model launched in 1998, and it’s still going strong today.
