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AIR MANAGEMENT
The vast majority of owners out there have taken the simple step of removing the lid from the airbox to allow the machine to breathe more easily. Most people who leave the lid on the airbox say they ride in a lot of water which causes them to worry about water entering the airbox. The opening on the airbox according to many people is well protected and they have decided to run their machine without the lid so long as they don’t do a whole lot more than splashing around in the water. Another option people have chosen is to add 1" filtered vents to their stock airbox to allow more air flow without removing the air box. Use a 1" hole saw, drill the hole, stick in the vent and that is it! You’ll probably have more trouble finding a 1" hole saw than installing these! If you traverse a lot of water, be sure to remember since these will let in air, they’ll certainly let in water. Air Feed Tube Currently no companies have stepped up to the plate to design a new air feed tube between the air box and carburetor. This tube when the engine is under power has said to partially collapse! causing the engine to get less air than it needs resulting in loss of performance. Currently the only real fix for this is to install an air filter that fits directly onto the carburetor. Some people have tried tricks like placing cable ties just snug around the outside of tube. Air Filters There are many air filter options for the DS650. Some people have taken the first step and installed an aftermarket filter in the stock airbox (some with, and some without the lid.) Others have removed the airbox, and installed an aftermarket filter directly on the carburetor (this is said to yield about 3 HP.) There are a wide variety of air filters available for the DS650 and listed below is a partial list of part numbers for those with descriptions: K&N UNI Dura-Blue
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