3.
To modify the FR21 or FR27 (pull start models) for non-pull start operation, the following parts are available:
•
FAN10410 Rear Plate for Non-Pull Start
•
FAN10414 Gasket Set
•
FAN10419 Rear Plate Bolts for Non-Pull Start
ENGINE OPERATIONAL GUIDELINES
This section covers important information useful in understanding the what, how and why of your new engine.
To get a full understanding of the remainder of this manual, it is important that we cover some basic principles first. Please make
sure you fully understand this section of the manual before proceeding.
Your new Fantom engine is built using the latest ABC technology (aluminum, brass, chrome). Expansion of the piston is
controlled by the percentage of silicon in the aluminum alloy; by matching the piston expansion to the expansion of the chrome-
plated brass cylinder-sleeve… both at normal operating temperatures (220º-290º F), the best running-fit can be obtained. (This
subject will be covered in more detail, later in the manual, in the “Break-In” section.) The cooling fin area of the cylinder head
regulates the temperature.
When a carburetor mixture is set properly, the temperature of the engine should be of little concern. The flash point of certain
modern lubricants found in high quality fuels is generally a minimum of 700º F; meaning as long as you are using high quality
fuel, your engine is protected even in extreme temperature conditions… IF THE AIR-FUEL MIXTURE IS NOT SET LEAN.
Unfortunately, over the years it has become customary to set the main needle valve by engine cylinder head temperature (usually
called temperature tuning); however, this is a bad practice. Temperature tuning can lead to overly rich or overly lean needle
settings – both can damage an ABC-type engine. Depending on the operating conditions (e.g., weather conditions, altitude,
surface you are running on, fuel type, etc.), we have found that the FR21 and FR27 cylinder head temperatures (taken with a
temperature gun; aiming down inside at the glow plug area of the cylinder head) will generally range between 220º and 290º F;
however, do not “temperature tune” to these temperatures.
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