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If the bike starts OK on your jump pack, it doesn't sound like the starter motor. The click/clunk may be the battery operating the solenoid but not having enough power to turn the starter. The battery should show over 12V when sat idle, this will drop considerably while cranking the engine but should recover quickly afterwards. 13.8V when running is the output from the reg/rec, the question is: is the battery holding a charge.
What does the battery info say when it isn't cranking and doesn't have the jump pack connected?
Press the 'MODE' switch on left switchgear up twice to display BATT info
Battery voltage indicator (BATT)
The battery voltage reading is displayed as follows:
- if the reading is between 12.1 and 14.9 Volts, it is steadily illuminated on the display;
- if the reading is between 10.0 and 12.0 Volts or between 15.0 and 16.0 Volts, it flashes on the display;
- if the reading is less than or equal to 9.9 Volts, the message “LO” flashes on the display and the “EOBD
engine diagnostics” warning light (8, fig. 4) comes on;
- if the reading is greater than or equal to 16.1 Volts, the message “HI” flashes on the display and the “EOBD engine diagnostics” warning light (8, fig. 4) comes on.
Any healthy battery should start the bike OK. Do you ever use a charger or optimate? If you get a lithium battery you may need to change these to suit, adding to the expense.
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