MTD 90 Series - CHAPTER 4: THE FUEL SYSTEM AND GOVERNOR; Inspecting the fuel

AIR INTAKE SYSTEMS
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5. Install the air filter by following the previous steps in
reverse order.
NOTE: When installing the air filter, the hole in the bottom
of the paper element must fit over the riser in the
air filter base.
See Figure 3.6.
Figure 3.6
Riser
Air filter base