Yfz450 backfiring and dying after 2 hours of riding - Yamaha YFZ450 Forum : YFZ450, YFZ450R, YFZ450X Forums
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post #1 of 16 (permalink) Old 01-08-2017, 05:57 AM Thread Starter
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Yfz450 backfiring and dying after 2 hours of riding

Hello my name is Jordan and i recently bought a yfz450 05 plate had a problem with when the engine has been running for a bit it would start backfiring and then dying worked out the stator was bad and it wasnt recharging so fitted a high output stator and rectier the problem seem to go away as battery was charging again rode it for 2 hours no problem and then ot started doing the same thing again but the battery is charging itself any ideas would be appreciated. Thankyou.
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post #2 of 16 (permalink) Old 01-08-2017, 10:31 AM
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Load test your battery. If it was being drained like that multiple times, there's a good chance you might need a new battery.


(I was in the same boat years ago. It was also the reason why I decided to become a Yamaha Tech.[ThumbsUp])

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post #3 of 16 (permalink) Old 01-08-2017, 10:51 AM Thread Starter
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Ok i will try that thank you i will let you know.
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post #4 of 16 (permalink) Old 01-08-2017, 11:43 AM
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Btw, you said its an 05 YFZ? Check and see if you have a lighting resistor kit on it. On 04 and 05's they had a problem with the lights and battery. If you always ran the quad with the lights on, it was fine, but if you ran the quad with the lights off and didn't have a resistor kit, it would drain the battery.

When I bought my 2007, it had either a bad stator or a bad regulator/rectifier, I forget which. But I replaced both with a TrailTech high output stator and regulator/rectifier. And that fixed it for a while after I put a new battery in. Then it started doing it again. Then I moved to Arizona, and it stayed back. When I came back, I looked into it and actually found that the lighting resistor kit was fried and would sometimes work, and sometimes blow fuses, and all the time wear my battery down.

$15 later, off ebay, I put a new resistor kit on, and yet another new battery, and she starts right up and runs fine without blowing fuses.[ThumbsUp]
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post #5 of 16 (permalink) Old 01-08-2017, 02:43 PM Thread Starter
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Ok if i run it with lights always on even with high output stator and rectifier it should be ok or would you reccomend the resistor kit?
Thank you for the reply.
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post #6 of 16 (permalink) Old 01-08-2017, 09:59 PM
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If you don't already have a resistor kit, I'd recommend one. I'm not 100% sure if the 05 wiring harness already has the connector wired in for it, or not. IMO, if you run the lights 24/7, eventually a light will go out, and it'll then start running the battery down. To me it's just safer to run a resistor kit.
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post #7 of 16 (permalink) Old 01-14-2017, 12:48 PM Thread Starter
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Hi again, so Iv load tested the battery and that is coming up as good battery, iv tried riding with lights on and still no fix it's runs fine for about 2 hours each time and then all of a sudden just starts back firing and then as I come to a stop it cuts out, it idles fine and is charging at 13.5 volts any more ideas guys? Regards
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post #8 of 16 (permalink) Old 01-14-2017, 02:20 PM
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What if your ignition coil stops working once it gets hot? If you're riding for 2 hours, then it starts back firing, and dies, maybe you loose spark once the ignition coil is hot enough. Do you ride for two hours, it dies, then you let it sit and cool off, then it'll start again?

Do you have a service manual for it? If you don't, you can find them online pretty easy. Or if you want to PM me your email, I'll send you one. How to check the ignition coil, and what the specs are for it is on page 8-12.[ThumbsUp]

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post #9 of 16 (permalink) Old 01-14-2017, 04:01 PM Thread Starter
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Maybe it could be my ignition coil what I did notice is when Iv taken the ignition coil out with the spark plug attached and I spark it I get a shock through the rubber further down?
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post #10 of 16 (permalink) Old 01-14-2017, 06:08 PM
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I emailed the manual to you. It's about 15.5MB.

You'll need a multimeter to check the ignition coil, but that'll give us a better idea of what's going on. Is there any small cracks or rips in the boot rubber?

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post #11 of 16 (permalink) Old 01-14-2017, 06:52 PM Thread Starter
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Not that I'm aware of il have a check tomorrow and thank you for the manual much appreciated
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post #12 of 16 (permalink) Old 01-14-2017, 06:57 PM Thread Starter
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And yes I have a multimeter what steps shall I take to check it?
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post #13 of 16 (permalink) Old 01-14-2017, 07:42 PM
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On page 8-12 in that manual, it'll tell you where to test, what setting, and what it should be.[ThumbsUp]

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2002 Yamaha Raptor 660R SE
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2006 Suzuki RMZ250
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post #14 of 16 (permalink) Old 01-15-2017, 05:20 AM Thread Starter
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OK thank you for help
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post #15 of 16 (permalink) Old 02-04-2017, 07:03 AM Thread Starter
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Hi sorry been so long to check back in regarding this problem just had a baby so the quad has been put on the back burner.
So I bought a new ignition coil and new NGK spark plug fitted it went out on it for about an hour and half, didn't have time to go much longer but so far problem fixed. So fingers crossed next time I go out on it things will be all fine. I would like to thank you all for your replies and help much appreciated and thank you Bob for the manual and resolving my problem.
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post #16 of 16 (permalink) Old 02-04-2017, 02:07 PM
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Quote:
Originally Posted by Jordan18000 View Post
Hi sorry been so long to check back in regarding this problem just had a baby so the quad has been put on the back burner.
So I bought a new ignition coil and new NGK spark plug fitted it went out on it for about an hour and half, didn't have time to go much longer but so far problem fixed. So fingers crossed next time I go out on it things will be all fine. I would like to thank you all for your replies and help much appreciated and thank you Bob for the manual and resolving my problem.
No problem bud! Good luck with the quad, and the kid. Haha
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