Modeling the Air Filter and Fuel Valve

1. Positioning the Air Filter Box

• Create a box to represent the air filter.
• Align it with the motor and surrounding parts using reference images.
• Adjust its thickness to match real-world proportions.
• Ensure there’s no overlap with the motor and other parts.

2. Modeling the Air Filter Shape

• Convert to Edit Poly and drag the bottom vertices down for proper shape.
• Adjust the back panel by angling it slightly outward.
• Extract the front face as a separate object for detailing.
• Use the Shell Modifier to add thickness.
• Apply Bevel to create the raised front section.

3. Chamfering the Air Filter

• Delete unnecessary back faces for optimization.
• Reset X-Forms to ensure uniform scaling.
• Apply the Chamfer Modifier with two segments for a smooth look.

4. Cutting Out Vent Holes

• Use the Slicing Plane to cut three vent openings.
• Adjust the slice positioning to match reference images.
• Delete the selected faces to create openings.
• Bridge the surrounding edges to form proper topology.
• Use the Cap Tool to fill any gaps.

5. Refining the Back Angle

• Add an Inset to prepare for back angle adjustment.
• Use FFD (Free-Form Deformation) Modifier to push edges inward.
• Ensure alignment with scan reference for realistic proportions.

6. Creating the Choke Lever

• Use the Line Tool to create the choke’s angled shape.
• Convert to a rectangular spline and add thickness.
• Convert to Editable Poly and apply Symmetry for both sides.
• Adjust pivot placement to rotate from the correct center.

7. Modeling the Fuel Valve

• Create a box as the base structure.
• Position it slightly off-center to match reference.
• Reset X-Forms before chamfering.
• Apply two separate chamfer operations for correct beveling.

8. Adding the Fuel Valve Handle

• Use the Regularize Tool to create a circular cutout in the valve.
• Insert a box for the rotating handle.
• Align the handle’s pivot to ensure proper rotation.
• Extrude the back face into the circular cutout to create depth.

9. Smoothing and Cleanup

• Apply Auto Smooth to all new objects.
• Ensure proper smoothing groups for clean shading.
• Convert any transparent objects back to solid.