Spark Plug; Battery; Battery Charger - Husqvarna TC449 Workshop Manual

AT-REST VOLTAGE * (V)
> 12.7
~ 12.5
~ 12.2
~ 12.0
~ 11.8
1 edition (08-2010)_Rev. 11-2010
st
ELECTRICAL SYSTEM
1
H06302
INDICATIVE CHARGE TIMES DEPENDING ON BATTERY CHARGE STATUS
% OF CHARGE
100
75
50
25
0

Spark plug

Check the gap "A" (0.7 mm) between the electrodes. A wider gap may cause
difficulties in starting the engine and overload the coil. A gap that is too narrow
may cause difficulties when accelerating, when idling or poor performance at
low speed. Clean off any dirt around spark plug base before removing the spark
plug. It is good practice to closely inspect the spark plug after removal, as any
deposits on it and the colour of the insulator provide useful indications on spark
plug heat rating, carburetion, ignition and the general condition of the engine.
Before refitting the spark plug, accurately clean the insulator with a wire brush.
Smear some graphite grease on spark plug thread, do it fully home finger tight
then tighten it to 10÷12 Nm torque. Loosen the spark plug then tighten it again
to 10÷12 Nm. Spark plugs which have cracked insulators or corroded electrodes
should be replaced.

BATTERY

The battery (1) is a sealed-for-life, maintenance-free battery. If the vehicle
remains unused for long periods, it is recommended to disconnect the battery
from the electrical system and store it in a dry place. After an intensive use of
the battery, it is advisable to carry out a standard slow charging cycle (12V-6Ah
battery: 0.6A for 8 hours).
Quick charging is advised only in situations of extreme necessity since the life
of lead elements is drastically reduced by such cycle (12V-6Ah battery: 6A for
0.5 hours).

Battery charger

To gain access to the battery (1):
- remove the saddle (as outlined in the relevant paragraph);
- first remove the BLACK negative cable, then the RED positive cable (when
reassembling, first connect the RED positive cable, then the BLACK negative
cable);
- remove the battery (1) from its housing.
Check, using a voltmeter, that battery voltage is not less than 12.5 V. If it is not
so, the battery needs to be charged. Using a battery charger with a constant
voltage, first connect the RED positive cable to the battery positive terminal
then the BLACK negative cable to the battery negative terminal. At a constant
voltage level of 14.4 V, apply "x" Amps according the battery's charge percent-
age as indicated in the table below. The voltage reaches a constant value only
after a few hours, therefore it is suggested NOT to measure it immediately after
having charged or discharged the battery. Always check the battery charge
before reinstalling it on the vehicle. The battery should be kept clean and the
terminals coated with grease.
CHARGE TIME (RATED CURRENT IN AMPS
TO BE APPLIED: 0.1x BATTERY RATED CAPACITY)
M.33
_
4h
7h
11h
14h