Periodically, check all wires to be sure they aren't crimped or have
loose connections.
Ignition Timing.
When checking the ignition setting at the time of
service, please have the URAL idling (800 rpm) and use a
stroboscope (timing light). This way a more precise adjustment can
be achieved than when using marks on the rotor and pickup base
as guidance. Usually, your stroboscope setting will match the
existing marks, but sometimes it will be a couple
degrees off. For future service you might want to put a small paint
dot on the pickup base indicating the most accurate ignition timing
mark (it will overrule the existing "0" mark on the pickup base, so
the rotor will have to match the new paint mark for the correct
ignition setting).
Note: The wrong ignition timing may seriously damage the engine.
It is easy to determine if ignition timing has been set incorrectly.
This may result in a denial of a warranty claim by URAL
®
America,
Inc.
Spark plugs.
In certain situations, spark plugs can quickly foul with
carbon or soot. The plugs can be cleaned but it is easier to put in a
new set of plugs when on the road. We recommend that you
purchase an extra set of these plugs from your Authorized URAL
Dealer and carry them in the motorcycle at all times.
The lower portion of the plug shell is threaded M14 X 1.25 with an
11 mm length of thread. Spark gap of 0.5-0.65 mm/0.020"-0.026" is
set between the side electrode and the bottom end of the central
electrode. Always use a crush washer when installing a spark plug,
preferably a new crush washer.
WARNING: Do not over tighten the spark plug when mounting
it on the engine, since this could damage the cylinder head.
Functioning of ignition system.
Both plugs fire simultaneously on
the left and right-hand cylinders, one spark being formed when the
compression stroke terminates in one of the cylinders and the other
during the exhaust stroke.
Carburetors
28 mm Mikuni VM-type carburetors are used on US import versions
of the URAL motorcycle for compliance with US EPA requirements.
The following sections have been extracted from the Mikuni manual
"Tuning Mikuni Carburetors VM & TM". These sections should
provide the owner and/or URAL mechanic with sufficient
understanding of the Mikuni carburetors to properly adjust the
carburetors to factory settings.
WARNING: To avoid severe engine damage, do no change
carburetor synchronization, jets, or throttle linkage. Tampering
with the carburetors or other critical emission elements is also
a Federal Offense and may subject the offender to civil
punishment and fines. This air/oil cooled engine must always
