Battery!!!

[TN94z]

I just went to the Yamaha dealer to pick up a replacement battery for my 04 YFZ450. They didn't have a stock replacement, but instead gave me a CTX9-BS and said that would be a direct replacement. I think it looks bigger than the stock one and don't think it will fit...but the Yamaha dealer assured me that it would. Have any of you guys used this battery or know if it will for sure work?

[Syrus]

Why dont u pop it in ur quad and find out yourself ? i dont think it could hurt anything, just check the amps, dont wanna fry ur electricals. If everything matches up with your stock battery then ur good to go.

[allamonyfz450]

whats up i just installed a battery out of a honda cbr600. i had to modify my battery box. i just cut out the blue flap behind the battery and slid the battery in. the bracket you can still use i straightend out the bracket on cut down to size and drilled holes to fit. it sounds tough but it is easy it maybe took a half hour. if you need help email me at bradallamon@hotmail.com good luck

[Bill Fuller]

Got any pics of how or what you did?

[TN94z]

I also went ahead and got the YTZ10s CBR 600 battery...It starts very easily now. Like previously stated, I had to modify my battery comparment but it was very easy to do.

[Jersey450R]

to all you YFZ owners out there...you have to ride with your lights on to charge your battery while you ride...you all know that i hope...right?

[gyt-r450]

yep>><< we all do i hope

[TN94z]

I ride with mine on...thought about getting the TT stator and rectifier...but I guess I will wait on that.

[mstngmatt]

I have my lights removed, can I turn the switch on to charge the battery also or does that not work???

[Duncan313]

Having the headlights removed and the switch on will not create the additional amperage draw that the rectifier is looking for. I saw a resistor posted somewhere that replaced the headlights and created the necessary amperage draw. However I have yet to find that site again. Anybody else find that product?

[Pappy]

trail tech offers a new rectifier that does away with the need for the headlights to be on to keep the charging system operating at lower rpm's.


the only true fix to the yfz problems is to have the stator reworked and make the rectifier switch. i believe the 05 yfz's are corrected from the factory but yamaha is remaining tight lipped on it.

[TN94z]

I saw a resistor posted somewhere that replaced the headlights and created the necessary amperage draw.


You can also get the resistor at your yamaha dealership. I will probably end up getting the TT package and be done with it...but not right now.

[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.
____part#________5TG-REGST-KT-00 part # for kit

thanks bc_____