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2017 yz250 with 16 hours. Was told the bolt that holds the water pump gear and power valve gear backs out and causes this. Anyone else have this happen ? If so, did yamaha cover it ? 
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2017 yz250 hole in case
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Bummer! Hope Yamy covers it for ya.
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still trying to follow Dad's golden rule..."USE YOUR HEAD FOR SOMETHING MORE THAN A HAT RACK!"
current rides:
'13 250SX
'17 701 Husky
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Had this happen on a brand new 125. I had the bottom end apart before ever starting it though so it was on me.
I’ve never seen something like this happen to a new, stock bike.
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I ripped a start from Egypt and I was happy about that.
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Location: La Verne, CA USA
Yes I had that happen to our 15. But never on our 09 Yamaha cover it? Depends on who you know if they warranty it.
But watch out. When They retap the bolt in the crank. The process push the crank over a bit that it cause friction on the bearing and we killed the crank. Really weird.
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Joined: 9/21/2014
Location: Chandler, AZ USA
My 16 did the same thing, As well as my buddies 16. I only had about 20 hours on it. Yamaha said that with the amount of hours I had, I should have replaced the crank twice. So they didn't warranty anything.
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I have seen this quite a bit, the case can be welded up with no issues, but the bad part is that the bolt usually damages the thread in the crank. Can all be repaired, just take your time with the thread. I last yz we got, l took the case of and loctite and tightened the bolt before even starting the bike and no problems. Seems to be a bit on the loose side from factory, maybe not every unit, but still common enough.
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Lucky13FIST wrote:
My 16 did the same thing, As well as my buddies 16. I only had about 20 hours on it. Yamaha said that with the amount of hours I had, I should have replaced the crank twice. So they didn't warranty anything.
10 hour cranks bro
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2009 Kawasaki KX450F
2009 Kawasaki KX250F
2002 Suzuki GSXR 600
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Lucky13FIST wrote:
My 16 did the same thing, As well as my buddies 16. I only had about 20 hours on it. Yamaha said that with the amount of hours I had, I should have replaced the crank twice. So they didn't warranty anything.
Thats shit. After reading the thread where KTM covered the engine that grenaded at 43 hours and then this reply I will be thinking long and hard about which bike I replace my YZ with.
Just checked the owners manual, says the crank should be inspected every 12.5 hours. That's crazy
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Location: Mount Morris, MI USA
Lucky13FIST wrote:
My 16 did the same thing, As well as my buddies 16. I only had about 20 hours on it. Yamaha said that with the amount of hours I had, I should have replaced the crank twice. So they didn't warranty anything.
Acidreamer wrote:
10 hour cranks bro
Seriously?
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My 16 is my 5th yz 250. Just broke 3rd gear at 25 hours. Bummed the rest have been good to me.
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Lucky13FIST wrote:
My 16 did the same thing, As well as my buddies 16. I only had about 20 hours on it. Yamaha said that with the amount of hours I had, I should have replaced the crank twice. So they didn't warranty anything.
Acidreamer wrote:
10 hour cranks bro
dafuq!
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Cheers, Crush
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dedi684 wrote:
My 16 is my 5th yz 250. Just broke 3rd gear at 25 hours. Bummed the rest have been good to me.
Loved all y YZ 250"s. 99,2000,2001, 2005 &2008. For some reason every newer one I had, the transmissions ate gears faster & faster. I got tired of replacing transmissions.....could not make it through a full season on one tranny. I have never seen the crank drive gear bolt/nut back off.....to the O/p, call Yamaha customer service & be reasonable & respectfull to whoever you speak with, it may take a few conversations, but usually you can work out something to help. I have had to contact Yamaha & Ktm customer service a few times, if the rep does not know how to handle the situation , give them a solution, ex: how about a parts credit at my dealer? How about parts & no labor ect. Something better than nothing....always worked for me....good luck...tell us how you make out....
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Not a single person, unless you are a Pro. Maybe not even then, aside from a top end.
Should be able to go at least 40 or 50 hours without opening the motor for the average joe.
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If you're not mixing gas, you're not haulin ass.
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What? Yamaha really told you that? There is no way that i would accept that as an answer. That is a disgrace.
Did your dealer tell you that or Yamaha USA?
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Location: KS, USA
that is BAD..I will never buy a yamaha after seeing that holly shit 12 hours for a crank inspection...Crazy!
..
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Location: Mansfield, OH USA
Lucky13FIST wrote:
My 16 did the same thing, As well as my buddies 16. I only had about 20 hours on it. Yamaha said that with the amount of hours I had, I should have replaced the crank twice. So they didn't warranty anything.
Acidreamer wrote:
10 hour cranks bro
I think its horse shit that that nut came loose. That nut should have been loctited and torqued from the factory.
Id look at their service manual and see if that nut is a part of the crank inspection.
Also my service manual for an 05 yz250 says inspect every 5 races not replace every 10 hours. Im 90% sure pulling right side cover is not apart of it.
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2009 Kawasaki KX450F
2009 Kawasaki KX250F
2002 Suzuki GSXR 600
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Same thing happened to a friend of mine in ohio. 5 hours. Crank bolt backed out. Yamaha covered it. Stay on them.
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Location: OH, USA
you would think Yamaha would cover that. this news spreads faster than good. killing potential buyers.
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If I'm healthy enough to complain. I shouldn't be complaining.
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Location: PA, USA
We have two 16 KTM 250 SX s with over 200 hours on the original cranks, he's a pro level off-road racer. At one time we thought about switching to Yamahas I dodged a bullet there.
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Location: GA, USA
Never seen that before. However, third gear dogs wearing out is a known issue. Yamaha, fix your dang bikes!
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Posts: 497
Joined: 2/6/2009
Location: Orlando, FL USA
I just did the crank and bearings in my 2013. Should I have loctited that bolt? I watched the Rocky Mountain video and used the washer to lock the gear and tighten the bolt.
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I use blue locktite on just about everything on the clutch side including the tranny bearing retainers on the inside
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Posts: 7
Joined: 2/10/2016
Location: OR, USA
I had this happen on a 99 yz250. When I took it apart I found that the output shaft on the crank was too short and the outside gear ( can't remember if it was for the water pump or power valve) was barely splined onto the shaft. If the gear was say 1/4" thick, then it probably had about 1/16" actually splined onto the shaft. I was baffled to say the least, maybe it was designed that way to save weight or something. I was not the first owner so perhaps it was the wrong crank installed on the bike somehow.
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Location: Ravena, NY USA
dedi684 wrote:
My 16 is my 5th yz 250. Just broke 3rd gear at 25 hours. Bummed the rest have been good to me.
sandman768 wrote:
Loved all y YZ 250"s. 99,2000,2001, 2005 &2008. For some reason every newer one I had, the transmissions ate gears faster & faster. I got tired of replacing transmissions.....could not make it through a full season on one tranny. I have never seen the crank drive gear bolt/nut back off.....to the O/p, call Yamaha customer service & be reasonable & respectfull to whoever you speak with, it may take a few conversations, but usually you can work out something to help. I have had to contact Yamaha & Ktm customer service a few times, if the rep does not know how to handle the situation , give them a solution, ex: how about a parts credit at my dealer? How about parts & no labor ect. Something better than nothing....always worked for me....good luck...tell us how you make out....
So I should get a 350 and a 250sx ( I didn't like my 15) and never look back? That's what I'm thinking 
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