The K&N HA-3094 is a washable, reusable high-flow replacement element for the Honda TRX300EX Sportrax, sized at a 2.875 in flange ID, 4.5 in OD, and 5 in height. The design traces back to early-1960s off-road racers who needed a filter that could catch grit, then be cleaned and reused instead of replaced. A K&N oiled-cotton element stays in service for years, which offsets its higher price compared with disposable paper filters. The manufacturer says it is built for increased horsepower and acceleration, though it publishes no specific output figures for this part.
For dusty trail and motocross-style riding, the manufacturer positions this element for extended use, and says it maintains clean carburetion even at high altitude. It also states that generally no jet changes are required with just the K&N element, so you can upgrade airflow without a carb tuning project. Backing it is the K&N Million Mile Limited Warranty, a lifetime-oriented coverage that is a meaningful factor when weighing a premium filter against cheaper replacements. Searching for a washable TRX300EX air filter, a reusable Sportrax 300 air filter, or a high-flow HA-3094 upgrade will lead to this exact part.
The manufacturer lists this filter for the Honda TRX300EX under the 93-09 designation. Confirm your machine's model year before ordering, because year coverage varies across listings. Maintenance is simple: the manufacturer's cleaning guidance calls for a service interval of about 50,000 miles on the road, with more frequent cleaning in heavy dust, and recommends only K&N cleaner and K&N oil. A screwdriver is the main tool you will need for the swap.
The manufacturer lists this element for the Honda TRX300EX under the 93-09 designation, and its year selector for the TRX300EX runs from 1993 through 2008. Details vary between sources on whether 2009 is covered, so confirm your model year with the manufacturer before ordering.
According to the manufacturer, on-road service is recommended every 50,000 miles. Service it more often if you ride in heavy dust, because fine dust operation can strip oil from the element and may require more frequent re-oiling of the clean side.
The manufacturer states that generally no jet changes are required with just the K&N filter element installed.
No. The manufacturer's cleaning instructions prohibit compressed air, high-pressure washing, steam cleaning, solvents, and heat drying, because these can damage the cotton media and rubber end caps.
Installation is a straightforward element swap that typically requires only a screwdriver. Before reinstalling, make sure the element is fully oiled, because the filter will not trap dirt properly without oil. Use only K&N cleaner and K&N oil when servicing it. Rinse from the clean side toward the dirty side with low-pressure water, let it air dry naturally, and then re-oil every pleat before installing. Seat the element fully in the airbox so unfiltered air cannot bypass it.
