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Christopher Moore Christopher Moore
8/4/2020 12:02 PM

Just a feeler if anyone had any problems with their 2020 yz450f. I race pro motocross and have just been doing a bunch of local racing here in NY/NJ/PA and the bike blew up with 31.2 hours. Oil is changed every other ride and filter every other oil change. Race days I change the filter after 1st motos. Bike gets regular professional level maintenance obviously. I’m pulling the motor apart now and will update when I find out what went wrong.

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Johnny Ringo Johnny Ringo
8/4/2020 12:03 PM

Is this a Justin Barcia burner account?

Alright Lunger, Let's Do It

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Moto520 Moto520
8/4/2020 12:11 PM

I haven't heard of anything like this. I have around 30 hours with no problems.

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PJRAUS PJRAUS
8/4/2020 1:32 PM

A friend of mine blew his motor on the 20 at 6 hrs I think he said...Yamaha covered it...motor was totalled.
I only have 1.3 hrs on mine, hoping everything goes ok

2020 YZ450F
2006 YZ125
2013 YZ 250F special edition
2017 YZ 250
2015 YZ 250f soecial edition
2019 KTM 85 big wheel

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vandy509 vandy509
8/4/2020 2:13 PM
Christopher Moore wrote:

Just a feeler if anyone ...more

Following this topic as I just picked one up and have about 2 hours on it. What happened that you're pulling the motor apart?

Only dead fish go with the flow

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Christopher Moore Christopher Moore
8/4/2020 2:34 PM
Christopher Moore wrote:

Just a feeler if anyone ...more

vandy509 wrote:

Following this topic as I ...more

Currently being taken apart at my mechanics house right now

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Timo_2824 Timo_2824
8/4/2020 2:52 PM

"I change my oil every 30 minutes, sometimes I have to stop riding just to change oil! If you don't change oil often your airfilter will fail..."

Sorry I couldn't resist, everyone who blows up a low hour engine starts out with I change the oil every ____ hours. Probably a freak part failure, valve or rod related.

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mxryan25 mxryan25
8/5/2020 4:57 AM

The stock filter setup on these bikes are notorious for allowing dirt to get in the intake, someone who would know says this is the sole reason of of yzf’s blowing up early

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spacecat spacecat
8/5/2020 5:05 AM

2 transmission failures on my yz450. Scared me so much I sold the bike.

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mx317 mx317
8/5/2020 5:14 AM

I just bought one Saturday. I've not seen anything local happen to any of them other than a rock got the case on one and drained the oil without them knowing.

Take it to the limit, one more time!

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Jack_Wagon Jack_Wagon
8/5/2020 7:03 AM
spacecat wrote:

2 transmission failures on ...more

What year was your YZ450?

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SweetDaddy SweetDaddy
8/5/2020 8:49 AM

I watched a guy remove his dirty air filter from his yz450 and saw dirt fall down into the intake. Talked to my mechanic about this and he said that the design is good for business.

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MotofactioN MotofactioN
8/5/2020 9:24 AM
SweetDaddy wrote:

I watched a guy remove his ...more

No matter what you do, small amounts will find there way in weather you like it, or know it or not.

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Racer16 Racer16
8/5/2020 10:32 AM

I have almost 30 hours on mine and no issues.

thereal1six

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Zycki11 Zycki11
8/5/2020 11:41 AM

It’s easy to guarantee no dirt gets in. Take a small handheld vacuum and when you change the filter just vacuum out the intake. Takes 3 seconds

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Dirty Points Dirty Points
8/5/2020 11:43 AM
Zycki11 wrote:

It’s easy to guarantee no ...more

That's not exactly easy, at least comparative to every other dirt bike air filter in history.

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inthebadboycorner inthebadboycorner
8/5/2020 11:48 AM
Zycki11 wrote:

It’s easy to guarantee no ...more

Dirty Points wrote:

That's not exactly easy, ...more

No it's not, but you all now know the issues, so a small vacuum is a great idea, cheap insurance I would say.

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racerx217 racerx217
8/5/2020 4:23 PM
Christopher Moore wrote:

Just a feeler if anyone ...more

Pro national rider
motor has over 31 hours
I am assuming first time it has been opened up...?
That cant be right.

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kpersonius264 kpersonius264
8/5/2020 4:29 PM

last week one of our local pro riders 2020 blew up at 25 hours. looks like the rod broke and put a big old hole in the cases.

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Mxracer607 Mxracer607
8/5/2020 4:36 PM
kpersonius264 wrote:

last week one of our local ...more

who was it kevin?

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BroFoSho BroFoSho
8/5/2020 5:03 PM

Probably something to do with the 31 hours by "Pro rider" thing.

That's like 250 hours by your standard vet rider

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Zycki11 Zycki11
8/5/2020 5:08 PM
Zycki11 wrote:

It’s easy to guarantee no ...more

Dirty Points wrote:

That's not exactly easy, ...more

How is this not easy? You walk over to the bike with it, undo the same bolt, pull out the filter and cage you were going to anyway, then vacuum it. Replace said filter and cage and done. It truly doesn’t take long

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Dirty Points Dirty Points
8/5/2020 7:03 PM
Zycki11 wrote:

It’s easy to guarantee no ...more

Dirty Points wrote:

That's not exactly easy, ...more

Zycki11 wrote:

How is this not easy? You ...more

Because you don't need to do any of that at all with any other air filter in history, which is why I said not comparatively easy.

My new design of toilet paper only takes one extra tool and just another half minute to get off the roll: easy!

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Zycki11 Zycki11
8/5/2020 7:19 PM
Dirty Points wrote:

Because you don't need to ...more

I’d rather deal with the air box/intake then air forks any day. That engine is amazing and it’s really not a large deal to take one extra step.

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Dirty Points Dirty Points
8/5/2020 7:22 PM
Zycki11 wrote:

How is this not easy? You ...more

Dirty Points wrote:

Because you don't need to ...more

Zycki11 wrote:

I’d rather deal with the ...more

I would think they could have spring forks, a good engine, and an air filter design that isn't potentially fatally flawed

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Christopher Moore Christopher Moore
8/5/2020 7:32 PM
Photo
Photo
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SwapperMX SwapperMX
8/5/2020 7:35 PM

Damn that sux. Diagnose the reason and buy a GYTR head to replace that one.

November 13th, Forever in our memories !!

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Timo_2824 Timo_2824
8/5/2020 8:09 PM

Interesting, obviously was oil, but the bearings look oil starved.
Couple of questions:
When you change your oil, how much do you put back in?
Do you ride wheelies for extended lengths?

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MotoX85 MotoX85
8/5/2020 11:17 PM
Christopher Moore wrote:

Just a feeler if anyone ...more

40 hrs on mine, no problems (vet A Class)

60 hrs on my sons 2019 YZ450. (local A class) No problems and piston looks almost brand new, (doing a tope end as we speak)

Not trying to say anything negative, but you are replacing timing chains and tensioners at EVERY top end correct?

At the A Class/Pro level, the chain and tensioner is more important to change then the piston.

Again, not trying to insult your mechanic ability, just making sure that, at the Pro level, you can burn through a cam chain in under 20 hours, right?

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MotoX85 MotoX85
8/5/2020 11:21 PM
spacecat wrote:

2 transmission failures on ...more

Jack_Wagon wrote:

What year was your YZ450?

Yea, Im interested in this also. Ive owned dozens of these bikes all the way back to the original 400. Transmission problem on a YZ 4 stoke...… This I have to hear about as it would be the first one Ive even heard of that is NOT operator error

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