battery

[mitchgncc711]

What battery is every one run in there yzfs.stock or other!!:devil:

[Splatter Matter]

here you go it the best set up out there
http://www.off-road.com/atv/tech/yfz450_fixes/battery.html

[Pappy]

the larger battery is a temporary fix...

have the stator rewound if you have a yfz with the electrical problem that has become a nightmare

i have that unit in stock if needed.

[excel416]

How much for a stator rewind? who does this?

[Glazier]

Originally posted by excel416
How much for a stator rewind? who does this?

Trail Tech rewinds the stators to DC power, the bad news is they are not accepting the 04 cores. I am not sure about exact cost as of now around $250.00 I think for new stator re wound to DC power. You will probably need a regulator/rectifier as well to convert this. Check them out but I believe they are on back order at least they were a week ago.

[maggiesboy]

there is a TB out for that. yamaha is saying to operate the machine with the lights in the high position. wow what a great fix! WHAT THE HELL? some of us race these things!

[BassGin3]

How common is this battery problem?? Does just about everyone with the yfz have this problem?

[mitchgncc711]

The other day i was riding with out my lights off and the battery went dead!!!so i charged it and rode with with my lights on and it was fine!!!

[airheadedduner]

Originally posted by maggiesboy
there is a TB out for that. yamaha is saying to operate the machine with the lights in the high position. wow what a great fix! WHAT THE HELL? some of us race these things!
The TB states that if you have removed the lights you can purchase the resister kit. I don't think it cost that much or is hard to install. I havn't done one yet. OR have seen many problems. The biggest problem I have seen is the battery on race machines is getting beat by the singarm and working loose. It then shorts to the frame through the braket and cooks. I know of one customer that runs his battery up front with zero problems. Cept when he crashed and it came out through the front of the bike.

HOw is trail tech rewinding them to DC power?? I havn't heard of this. WIth DC you would not need a rectifier, only a regulator.

[Shocka400ex]

Here's my question about a battery problem.
This past weekend at the dunes I realized there was something wrong with my electrical. When ever my bike sits it seems my battery looses charge. When I first start riding my bike sputters and pops at high RPM and after it seems like it charges it seems to run fine. Does anyone know exactly if this is my battery or my stator that is going bad. O ya and when ever I get back and put my bike on the charger it says that the battery is fully charged.
Any info is appreciated.

[airheadedduner]

You need to use a multi-meter and check for a draw. Do so by removing your battery and conecting the tester leads to the battery leads. If it gives you a negitive amp reading with the key off then you have a draw on the system. To check if your stator is charging properly start the bike and check how many volts are going to the battery. Should be around 14. You need to have your battery load tested, not just but on a charger. A bad battery can still reach full charge, it just won't hold it.

[Shocka400ex]

Hey thanks for the advice. I'll check it out today.

[Splatter Matter]

Unique Charging System Characteristics - Yfz450
The YFZ450 Charging System is designed to
supply at low to medium engine rpm a maximum
charging rate with the headlights in the
ON position. Under some conditions (e.g., low
speed with cooling fan running frequently or
continuous high rpm riding), it may be necessary
to ride with the headlights in the ON position
continuously to maintain a fully charged
battery.
If a customer complains of the battery discharging
while riding, first check the condition
of the battery.
NOTE: If improperly charged or boost charged,
these compact batteries could overheat and
become permanently damaged. To prevent
overheating, charge the battery using a low
output charger (e.g., Optimate III, ACCOPTIM-
AT-E3), and test the battery to make
sure it is in good condition. Next, Check the
output of the charging system.
To avoid mis-diagnosis, follow these procedures
and specifications in the order below:
1. Minimum key off (battery voltage must be
12.80 VDC).
• Voltage too low: recharge and load test
the battery.
2. Measure the battery voltage at idle. *It
should be 14.0 ~ 14.9 VDC before the cooling
fan starts to cycle ON and OFF.
• Voltage too low: check the stator coil
resistance. The correct specifications
are:
– Yellow to Ground = 0.22 ~ 0.60 ohms
– White to Ground = 0.29 ~ 0.84 ohms
– Out of Spec: replace stator assembly
• Voltage is too high: check wire continuity
(particularly the black wire which
should have continuity between the
Ground). The Yellow/Red wire should
have continuity between the lighting
coil and the regulator.
NOTE: If continuity checks good, replace the
regulator assembly. (Commonly, both headlights
are burned if the regulator has failed.)
• Voltage Okay:
–
–
–
NOTE: Do not check the battery voltage at
5000 rpm as explained in the Service Manual.
Charging output will decrease as rpm increases.
This is a normal characteristic of this
model.
*Since the system normally discharges anytime
the cooling fan is ON, all testing must be
done before the fan starts to cycle on and off.
Otherwise, the maximum measurable battery
voltage will be lower than 14.0 VDC.
SUBJECTS: 1. Unique Charging System Characteristics - YFZ450
2. Introducing YFZ450 Charging System Resistor Kit -
Resistor Kit for Competition Usage
3. YFZ450 Resistor Kit Installation Instructions

Check the radiator for blockage and
correct as required.
Advise the customer to use the key
switch to turn the engine off. Only
use the engine switch (on the handle
bar) in an emergency.
Advise the customer to switch the
headlights ON to increase the charging
output.
Introducing YFZ450 Charging System Resistor Kit -
Resistor Kit for Competition Usage
Symptom:
As explained in the previous subject (page 1),
the YFZ450 Charging System is designed to
supply at low to medium engine rpm a maximum
charging rate with the headlights
switched to the ON position. If the headlights
are removed for competition use, the unit may
experience battery discharging.
Remedy:
Install the YFZ450 Resistor Kit. The kit contains
a ceramic resistor which takes the place
of the headlights to maximize the charging
rate, plus it provides a higher temperature fan
thermoswitch to minimize current draw. The switch is
located sitting on the bike the upper right switch
NOTE: This higher temperature is still low
enough to not cause engine overheating.
The kit is optional for competition use and warranty
does not apply. The kit was developed to
allow maximum charging and reduce battery
load.