yfz light problem

[QuadRacer041]

i a freind of mine just bought an 05 yfz used.he's been riding around and he said the bike runs like a bandit with tthe lights turned on but if he turns the lights off it runs like crap.what the heck could cause that?
i vaugly remember hearing something about this were is there is something wrong with the charging system, and you have the lights turned off it over charges and doesnt run right and when you turn them on it runs ok.

anyone have any idea's?

[EvilJester400EX]

He needs one of those kits from Yamaha. I forget what they're called, but when they are installed on the bike you can run with the lights off just fine. I've never had a problem with mine running bad without the lights though.

[SRH]

its called the resistor kit i just ordered one from yamaha last night cost me 51 bucks, fixes the problem from what i hear

[Punk'd]

Thats stupid that you need a kit for that..

[jshtex]

The kit is to take the place of the lights for people who (like me) run without them. If you just got an 05 and you want to run the headlights (ever) I would take it back to the dealer and get them to fix it. If you don't plan to run the headlights buy the kit.

I pulled our lights off before we ever road ours and we race XC so I don't need them, but we haven't had that problem so I haven't bought the resistor kit.


Thats stupid that you need a kit for that..
Yeah I know what you mean its almost as bad as having to kick start your quad all the time.... ;)

[SRH]

Originally posted by Punk'd
Thats stupid that you need a kit for that..

yeah its pretty bad you need a 300 dollar kit from honda to keep up with us...then its even worse you dont even have estar :eek2: :p

[Jersey450R]

When the lights are on on the yfz's, it makes the circut complete. Thats why when they first came out, everyone had dead batteries. You should just run with the lights on if you dont want to buy the kit. I know its weird...but it is a Yahama! JK fellas, i like the quads.:)

[QuadRacer041]

thanks for the input guys but i really didnt ask anyone to bash the honda.

[CTmxyfz]

you don't need to resistor kit. I have had my bike sine 7-23-04 and have any encountered 2 dead batteries due to leaving my key on sometimes to let the fan run. Dumb idea... don't ask..

check the fuses, wiring and maybe the stator. I though my stator was fried but i guess its not. Check around for things.


Hey Lou, ill bash the crf your building... hehe. It is a walsh bike though, can't bash too much on the chassis.

[QuadRacer041]

yea pappy said that it might be the stator.i dont think its a fuse cause it runs.the bike is only a few months old, that would be warrentied right?

[jshtex]

Originally posted by CTmxyfz
you don't need to resistor kit. I have had my bike sine 7-23-04 and have any encountered 2 dead batteries due to leaving my key on sometimes to let the fan run. Dumb idea... don't ask..

Actually from his description he has the exact problem the kit is made to correct, but like I said, if it was me and I wanted to be able to keep the lights I would go back and get the dealer to fix it. If it is still under warranty, you have an easy enough problem to demonstrate to them. Just run it for them with the lights on and off and show them the difference.

As for the Honda bashing, I was just poking BACK at him for his comment (in the yfz thread) thats why I put the ;) in there. I love Honda's, heck my son won 9 out of 10 XC races last year on his 416ex. The dealer who sponsors us sells both Honda and Yamaha and even put together one of each for my son to try. He liked both and could have won on either, but ultimatly it came down to the electric start as our series is dead engine start. We race with Rs all the time and in most cases they crank on the first kick but sometimes... And fighting your way thru a pack in a race that is so dusty or muddy you can't see isn't fun.

[SRH]

dont be lazy, this "honda bashing" would never have a occured one such expirienced member as yourself had used the search button,thats right folks that button plastered all over every page,when not used properly it can result in worthless threads and flaming


http://www.exriders.com/vbb/showthread.php?s=&threadid=130448&highlight=lighting

[SRH]

this is what your freind needs or he oculd do what all the other guys do buy bigger batterys, stators, etc and still have problems or do what yamaha calls for

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 kithttp://www.imagestation.com/picture/sraid139/p0bc1e8ccf76ef5d0a1d6df25b871b517/f710824d.jpg

[jshtex]

Originally posted by SRH
this is what your freind needs or he oculd do what all the other guys do buy bigger batterys, stators, etc and still have problems or do what yamaha calls for

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 kithttp://www.imagestation.com/picture/sraid139/p0bc1e8ccf76ef5d0a1d6df25b871b517/f710824d.jpg


Way to cut and paste. Couldn't you have just posted a link and said how you found it instead of slamming him???

[SRH]

Originally posted by jshtex
Way to cut and paste. Couldn't you have just posted a link and said how you found it instead of slamming him???

i could of but he didnt find it originally, so i wasnt too confident he would find it.

by the way i did post the link, you people just need to read posts more carefully instead of skimming, and yes thats cut and pasted originally from a yamaha service bulletein(sp), you actually think i was trying to credit that information to myself?
please im not slamming him... he said there was no need for honda bashing, im just pointing out there was no need for this post.

[QuadRacer041]

Originally posted by SRH
i could of but he didnt find it originally, so i wasnt too confident he would find it.

by the way i did post the link, you people just need to read posts more carefully instead of skimming, and yes thats cut and pasted originally from a yamaha service bulletein(sp), you actually think i was trying to credit that information to myself?
please im not slamming him... he said there was no need for honda bashing, im just pointing out there was no need for this post.



id did do a search jerk off.
the thread you highlighted has nothing to do with my quesion.new part for yemaha what does that mean????
what a d1ck.
i saw some things that had to do with what imasking about but nothing specific.
i didnt call anyone names or make it out like anyone was too stupid to find something.there was no need for that type of comment.
i was just trying to get some information itsnt that what this place is for?

[SRH]

Originally posted by QuadRacer041
id did do a search jerk off.
the thread you highlighted has nothing to do with my quesion.new part for yemaha what does that mean????
what a d1ck.
i saw some things that had to do with what imasking about but nothing specific.
i didnt call anyone names or make it out like anyone was too stupid to find something.there was no need for that type of comment.
i was just trying to get some information itsnt that what this place is for?

obviously you dont know how to do a search i put in lighting and it came up with those threads, read them....whats more specific than what i found?