Honda Express Spark Plug inspection begins with understanding how the spark plug functions and what a GOOD running engine's moped spark plug should look like. I will also touch upon inspection, adjustment, and where to buy moped spark plug for sale.
Two cycle engines run hotter than four-cycle engines since each upward movement of the piston is a compression stroke and each downward movement, a power stroke. At the peak of the compression stroke an electrical current is sent through the spark plug and creates an electrical spark. This spark ignites the air/oil/fuel mixture thus generating the power stroke downward.
The electrical current jumps across a "gap" on the spark plug. The gap can be adjusted to the honda nc 50 manual specifications to ensure proper firing. The correct spark plug gap for the 1978 Honda Express is 0.6 - 0.7mm [see diagram below]
[click above graphic to enlarge]
Pep Boys and Advanced Auto Parts. [see picture of tool to left]
To achieve your honda moped's top speed you need to have the right combination of air and fuel in the cylinder to be ignited. This is when you will hear the terms "lean" and "rich" concerning your mixture.
- Moped Engine Running LEAN - Too much air in fuel/air mixture being fired by the engine.
- Moped Engine Running RICH - Too much fuel in the fuel/air mixture being fired by the engine.