carburetor (overflow /breather) whilst the engine is not operating if the fuel level (in
the tank) is higher than the fuel inlet on the carburetor (overflow /breather) when the
model is parked or stored. This could be a fire hazard and or cause damage to the
model, the more so if the engine is mounted with the carburetor behind the firewall
(see below).
Single cylinder JC Engines feature rear induction in the interest of performance and a
smaller frontal profile. you may mounted directly onto the firewall (with a suitably
sized hole in the firewall) placing the carburetor behind the firewall. Alternatively,
the engine can be mounted onto the firewall by means of the engine mount stand-offs
provided. Either way, ensure a clear passage for induction air to the carburetor.
These instructions do not attempt to address the integrity of the airframe structure
other than to urge careful and regular inspection of the relevant materials and bonds.
It is important that the mounting plane (surface) is the same for all four attachment
points, i.e. the firewall is perfectly flat. Cap head bolts and penny washers are
provided for firewall mounting. There is approx 20mm of thread in each engine
mount pillar and 25mm cap head bolts are provided. This allows up to 10mm for the
firewall, washers and spacers. Please ensure that these bolts do NOT bottom out in
the mounting pillars, the bolts will not be holding the engine securely and the threads
may be damaged. Ensure that at least 6 mm
of the bolt threads penetrate the mounting pillars, 8mm is better. Longer or shorter
bolts are available.
Ignition Module:
Mount the ignition module in the fuselage or under the cowl. Thick (two layers)
double sided tape or a foam pad will provide vibration isolation and plastic cable ties
should complete the task either way. Do not hard mount.
Use the same gauge wire (or larger) as used on the red and black power leads on the
ignition module, all the way to the battery pack. Keep wire lengths to a minimum.
Use a high quality switch such as a Futaba or JR switch. Low cost budget switches are
not recommended.
There are differing views regarding the use of a 5 cell ignition pack, All testing with
a regular NiCad or NiMH 4 cell pack has produced satisfactory results but there may
be circumstances where a higher voltage is advantageous. A 1,500mah pack is
adequate for a typical flying session.
Please use the spiral wrap provided, especially on the HT plug lead to prevent rubbing
against fiberglass or other sharp edges. Damage to the wire mesh shielding has been
known to cause erratic engine operation as well as radio interference.
