1. Small Engine Parts
System by System

2. Engine Systems Mechanical Ignition Fuel & Air Delivery Lubrication
Exhaust
Electrical…Charging, Starting, Lighting & Accessory
Cooling
Emission Control

3. Mufflers..Quiet & Help with Scavenging

4. Exhaust
A system to quiet the engine operation and properly scavenge out spent air & fuel without allowing fresh air & fuel to leave the engine

5. Anti-after-fire solenoid
Stops the “pop”
after shutting off the engine
Closes the main jet
Reduces HC emissions

6. Compression ratio is designed to keep burning well below
2400 Fº in an effort to reduce NOx emissions

7. These adjustments are either non-existent or are capped-off
on low emissions engines in an effort to prevent indiscriminate
adjustment by unskilled individuals which would lead to increased
HC & CO & NOx air pollution.
High Speed & Low Speed Mixture Screws