Yamaha ATV Electrical Problems | YFZ450R Not Charging | Partzilla.com

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After a weekend at the track, we have seen some charging problems on our Yamaha YFZ450R. Today, we’re going to go through the electrical system on our Yamaha ATV and see if we can identify the problem. We’ll check the battery to make sure it’s good first, then we’ll dive in and check out the charging system on the YFZ. We’ll test the stator first, and then we’ll move to the regulator rectifier to see if we can identify the problem. Once we determine that the problem is with the regulator rectifier, John will show you how to easily change out the unit.
Read how to do this job step-by-step: www.partzilla....
VIDEO HIGHLIGHTS:
Removing the seat - 1:10
Testing for a charge - 1:23
Stator resistance test - 2:30
AC volts test - 4:18
Regulator rectifier test - 4:45
Replacing regulator rectifier - 5:40
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In the video we’re working with a 2009 Yamaha YFZ450R, but you may have similar steps for your Yamaha ATV. If you’re not sure whether these steps apply to your machine, leave a comment and we’ll get back to you.
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[@jjwalker2011]

It was always my regulator/rectifier on my 1990 FZR! I lost count how many times I changed it. Nice vid👍🏻

[@stimothy9396]

Thank you guys for the yfz450r repairs series! Its helped me learn alot. Could you guys do a video for a "engine code 39"- injector (open circuit)

[@jsmcguireIII]

My Kodiak not charging and the stator dynamic output is in the 30-33 V AC range. Bike idles for ten minutes and battery drops from 14 to 12 V DC, and then down and down. I'll swap out the rectifier and pray it's not a short somewhere in the harness. I know the rectifier gets VERY hot so I can see how it might be prone to failure. Thanks for the helpful video John.

[@kayleeaki1675]

My bradda thank u for all these videos. I get one problem that really need help with if possible. I changed the stator changed the complete harness and starter relay now I have no Neural light and no power to harness idk what I could to please help

[@foxticity]

Please can you post a video about the TPS Sensor... Both how to replace them and also how to bypass them please. I keep getting error 37 so I believe these steps will help anyone else with the same issue.

[@Buuuuuuuuuuuuurp]

Thank you so much for this video, it helped me diagnose the problem on my XT660X with the regulator/rectifier. Funny thing that I noticed; the faulty part tested OK with the diode test when the bike was 'cold', however after running the engine for a minute or two and re-testing the part right after, it actually tested faulty until it cooled off again.

[@401build]

Hi i replaced stator and rectifier and battery and still no charge whats my next step?

[@pedromendia152]

Could you make a video on a coolant change

[@PartzillaParts]

Got a lot of requests for coolant changes on lots of models. We're getting them on the list!

[@brandon25184]

Will this work for a 2019 yfz450r?

[@johnathancontreras4354]

I have a similar problem with my YFZ as well. My battery has 10 volts when I used the voltmeter which is already bad, but when my YFZ is running at idle the volts go up to 28 and as I add gas to the throttle it'll only keep going up. I’m thinking it’s the stator but I really don’t have any idea of what it is since I don’t know much about them.

[@jose1520andino]

Have you ever come across the same motorcycle but from 2020 that makes the exaus red hot? What problem could that be? Some people tell me what the CDI is???😊

[@adventuresiwork3563]

Durham town? I went there a few weeks ago.

[@braxtoneckman687]

What does it mean when the fuse on the starter silonoed keeps blowing?

[@mjochoa2007]

New regulator recrifier..

[@eljefepallares3663]

This help me so much thank you

[@bird157]

What if I don't get 12 volts from top red and black wires on top of regulator plug?

[@Rakit_time]

Same problem on YZR 15 ..

[@xc2bhx]

Thanks john🤙🏽

[@omarstanley4922]

Just bought a 2017 yfz 450 and it won’t idle do u know what the problem can b

[@javierguadarrama1093]

So what if I got around a 10.3 on the regulator rectifier test, but had a 12.08 battery when tested?

[@tomyarosz7407]

Hello I have an 09 yfz450r thing was running great and all of a sudden the battery went bad switched the battery out its charging fine starts right up, But now the bike backfires and spudders and even sometimes shuts off when you accelerate any idea where to look ?

[@mikem6928]

Did you find out the problem?

[@joseluischavez8165]

What would happen if my ATV has an insufficient gasoline injection and does not start? Also the only time it starts is when I straight up spray gasoline from a bottle to the throttle

[@thedoeboy718]

I have 804YFZ 450 trying to figure out why it is not getting spark and where is the power coming from battery full

[@viscarra40]

Did you ever figure it out bro have same issues with mine.

[@bmanscire]

awesome video!! thank you 😊

[@georgevillarrealjr2687]

Is this located in the same place on my 2006 Yamaha raptor R , it's water cooled

[@codyreid4773]

I had a 2015 Yzf450r hello it idles high when I turn on the high beam when the light is turned off there is no throttle response when it sitting and idling it ran fine before I let it set any ideas will be greatly appreciate it thank you

[@demarcusbracey5767]

What does it mean when my 07 fyz 450 only cranks when boost off & I have to touch the solenoid to start it when I turn it off it has no spark ! from the switch it just slicks and my red light flashes!

[@viscarra40]

Hey guys any idea why 2005 yfz 450 is not sending any power to the bike i have a new battery replaced the key switch and starter solenoid cleaned the neutral switch and still nothing i hit the key and doesn't do anything

[@nicky_9791]

Can someone please help I have an 09 yfz450 r that will usually not turn on when I turn the key but if I jiggle it really hard it will get some lights on then when I try to start it just drags and will start sometimes

[@dssurfs]

I have a 05 yfz 450 that won’t start I have replaced the battery the starter the sylinoid and the plug for the spark plug but it still won’t start, it turns over but won’t start. Could my issue be the stator ? Or another issue please let me know your opinion thank you

[@PartzillaParts]

Are you getting spark at the plug? If yes, check your fuel.

[@voctv1719]

I’m having the same issue

[@lukepatterson4395]

Currently working on an 04 Kodiak the starter turns over but the starter turns a long time before the motor picks up and turnsover to crank

[@PartzillaParts]

If the starter spins before it catches the motor, check the bendix gear and the starter gear for damage

[@matthewcoltrane1992]

Hi john - thank you for the videos. I have an 09 yfz 450r. Having some battery troubles. Put new battery in. Voltage across leads at idle is 14.35. I also have a parasitic draw of .17 between my positive post and positive lead with the key off. I’m guessing the regulator is allowing to much juice back. I’m hoping that maybe that regulator is causing the draw also? Thank you for any help?

[@PartzillaParts]

Check wires and cables. You can disconnect the regulator to see if there is bleed off, causing the drain.

[@xtremeoffroadllc]

John, Is this your son's bike? I seen you got him one for Christmas years ago! EDIT: Nevermind, i watched the whole video and you verified it was Lol!

[@TalleyHoV]

Yep, Christmas 2012. kzbin.info/www/bejne/hofNmaZpqM1lpas

[@daviddobro1873]

Why does my fuel pump keep breaking or stop working? I rebuilt it once and it ran fine now it doesnt even turn or suck gas. Anyone know?

[@davidvasquezmichel3634]

Hello, I have a 09 YFZ450R. That idles for 15 seconds and some times 2 minutes then it dies. The battery is reading 12.36V and when is running is at 13.45V. The resistance on the startor is 0.4ohms on all 3 coils. But the voltage is around 33-34 AC volts. But some times the multimeter reads as low as 32.2 volts. It has continuity from voltage rectifier to the battery and from the voltage rectifier to the stator too. Do you guys think that my startor is failing? Thanks in advance!

[@ddddually356]

Can you provide some help on a yfz450, not having a spark. Was running fine until I changed the battery. I pulled the spark plug coil and hit the start button and no spark that I can see.

[@PartzillaParts]

Did you check your fuses?

[@notsobadguy312]

I got 05 yfz 450 .it wont turn over unless jumping solenoid or wire yellow on neeutral switch then the start button works but now new Ricks stator and rectifier still no spark or button wont work without jumping yellow neutral safety relay wire I installed a new neutral relay by battery no green lights nothing even put a neutral safty switch by shifter .im stumped maybe tors or tps is all that's left I added 3 ground wires for the teck of it nothing could those 2 diodes cause this up front. I know they are bad v ffron av test well one is I don't know which is which. It has lots of compression maybe .i'll get coil also I want to delete all safeties but don't know were to start any into would be great. Also new cdi installed.

[@risc19]

Regulator rectifier, it's always the regulator rectifier. They have left me stranded before.

[@OozoO09]

I have a 2014 Yamaha yfz 450r I’ve been getting code 46 has anyone fixed this issue what more or less what could I’m thinking is my stator since my head lights flicker when they are on

[@PartzillaParts]

Could be anything with your electrical system, test the stator and regulator to start.

[@OozoO09]

Partzilla if those two are in good condition what could it be ?

[@Comfooaa]

When reading the plug to the stator I get off 0.65 ohms from A-B but then from B-C C-A I get 4.5 ohms. Could that mean something is wrong with the stator?

[@PartzillaParts]

Should still be within limits.

[@TiberiusStorm]

If the DMM showed the reg/rec was fine, why wasn't it working properly?

[@PartzillaParts]

A DMM can only peek inside and look at the diodes on the rectifier portion of a regulator/rectifier.

[@daundrep]

06 yfz450 is killing my battery. Cell is completely dead. Replaced stator, RR, and some other electrical parts. Please help

[@PartzillaParts]

Has it killed multiple batteries?

[@daundrep]

@@PartzillaParts so far two...

[@superrask814]

i wanna know how i can buy parts to other atv's

[@PartzillaParts]

www.partzilla.com is a good place to start!

[@sonushakil2029]

Yamaha 450R how to chek missing

[@saidal-tamtami294]

fill pump tank for yfz450r

[@danieljohnson76]

Could a bad stator or rectifier cause a yfz 450 to only backfire and not stay started?

[@anthonyalaniz3225]

I just had this happen to my 2004 yamaha 450 yfz. Change the stater and it drove nice for awhile died again. Will have to change rectafire and stater again

[@MegaIslandboy671]

Hey Daniel,did you ever figure out if you're issue was the rectifier?

[@MegaIslandboy671]

My yfz cranks but never starts I think it ain't getting fuel

[@MegaIslandboy671]

Mine backfires too...but doesn't stay started

[@timriedout9961]

My 04 yfz 450 acts like it's hitting rev limiter at half throttle can't tell if it fuel or electric problem

[@ucatchme25]

Hello Tim, did you ever figure it out?

[@BBperformance.]

@@ucatchme25 Mine did the same but would run fine with the lights on. It was the rectifier

[@shawnboyett8726]

Hey guys i have a 2013 yfz450. Went for a day of riding and an hour into it, it started sputtering at mid throttle and has started running a little rough. Is this a carb and fuel issue or is there something I'm overlooking

[@Gunstv94]

Have you fix your problem I’m dealing with same issue now

[@shawnboyett8726]

@@Gunstv94 unfortunately not I ended up taking it to a shop and letting them deal with it. A tune up and a new airbox and intake fixed it

[@notsobadguy312]

And new cdi