Broken Frame 2010 YZ450F

Been a member for a while but didnt post anything until now. I purchased by 2010 YZ450F about 6 months ago from a racer. I checked everything out on the bike and it seemed great. He said he just upgrades bikes every year and this was his previous year bike. I have been trail riding and riding mx and supercross at a local track. It does have suspension work by Total Control Suspension for a 220# rider and I'm 190. Long story short, we were riding at the track yesterday for a few hours and when I parked to talk to a few buddies one of them noticed that the frame was cracked close to the steering head. After further investigating we found that it was craked on both top tubes that connect to the steering head about 3/4 of the way around. The tube that comes down from those tubes and connects to the down tube is broken completely off the down tube. The down tube is cracked about 1/2 the way around. So it seems that it would have only taked a few more landings before it completely broke the steering head off. ALL of these cracks started or are completely through the center of the welds. All of the cracks/breaks look clean inside, like a fresh break. Is this a common problem on these bikes? I called Yamaha hoping for some help but you all know what they said, its not a defect. Is there anyone else that I can contact? I talked to a yamaha customer specialist, but had hoped to talk to an engineer. I can include pics if anyone would like to see them.

Pics please! Its definitely a poor weld job if it cracked along the welds they should be stronger than the material being welded if done right.

Used to happen on the previous generation frames at the same place

This frame is totally different than the older models. Whats the process of posting a pic?

This frame is totally different than the older models. Whats the process of posting a pic?

no shit sherlock, they still used to break on the downtube leading down from the steering stem

sorry, didnt know your background. Still need help on posting pics.

sorry, didnt know your background. Still need help on posting pics.

I was a bit abrupt in my response too -- sorry. Yours is the first cracked late model frame i have heard of -- the older ones usually were on higher hour machines, but not always

most people post pics from a photobucket account (they're free -- photobucket.com) --- you post pics to photobucket, then copy and paste the pic's IMG code to your thread

Ideally, you want a photobucket accout. You can upload the images to it and then use a link.

Cracked frames happen. You have a used bike and the warranty is long expired. Either find a very good welder who knows the correct method required to repair the frame, source a frame from a bike being parted or buy a new frame from a dealer.

frame2.jpgframe1.jpgframe3.jpgFrame4.jpg

I was just comparing these welds to my 2013 YZ 450. They definitely look cleaner on the 2013.

I've heard of this happening on the 2010 and 2011 models (not yet on the 2012, may have not been enough time on them or maybe Yamaha fixed this). 220lbs is quite a bit if he was really harsh on the bike.

If I were you, I'd find your local dealer and have them press yamaha for a new frame. Your other option is to have it welded by a shop in town. If done right, they can make this stronger than it came. If I were in your shoes, I'd push your local dealer first, then try a welding shop (good one).

I'm glad you caught it before something really bad happened. I'm 215/220 Lbs, have been riding 450's for 7 years (MX) and haven't had anything like this happen on either my Yamaha's or Honda's. For all I knew, frame breaks were a thing of the past, gone with the steel frames.. Suzuki's aside.

I talked to my local dealer today and they are forewarding the pics of the breaks/cracks. They said that there wasnt any chance of yamaha offering any help on a 2 year old second owner bike. Who on here would trust a welded frame? Thought about adding gussets in the cracked/broken areas where fitment isnt so tight. The majority of my riding is outdoor mx.

I've ridden with a welded frame many times, but steel - not AL. Suzukis were really bad --- had to break apart the factory welds and re-weld a few complete frames they were so bad (not me, i used a welder who is a race car fabricator ) -- also added additional gussets while it was blown apart

Thats a lot of breaks in yours -- i would scour ebay, etc. looking for another frame first, then if that turns up nothing, have it welded by someone who specializes in high performance equipment --- for instance , high speed drag cars and the like have to meet certain safety specifications to even go on the track at a sanctioned event. -- somebody who deals with 220 mph cars likely has the skills to trust for a bike

Wow, just looked up a frame on the TT store for kicks, $2150??? Wow.

Yah they aren't cheap! That's why I'm trying to help him find a way around this, without dropping mad money.

I talked to my local dealer today and they are forewarding the pics of the breaks/cracks. They said that there wasnt any chance of yamaha offering any help on a 2 year old second owner bike. Who on here would trust a welded frame? Thought about adding gussets in the cracked/broken areas where fitment isnt so tight. The majority of my riding is outdoor mx.

As the previous poster eluded, find a high quality performance welding shop. Anyone that knows this aluminum will be able to make their welds stronger. You might have to look around, but I'm sure you can find someone. Ride it gently at first, then progressively push it. Keep an eye on the welds, etc. There is definitely an art to welding this type of material. Material, temp, speed, cool down, all contribute to strong welds. It looks to me like Yamaha didn't do very well with these frames in that year or 2011.

My 2011 cracked in the same identical spot after 40 hours. I worked at the local Yamaha dealership at the time and immediately notified the Yamaha rep. He did some research and Yamaha said they have no heard of any others cracking like this. They were willing to help me out a little but not to the extent I wanted. I had it welded and it cracked again after 20 more hours. I've cracked 2 subframes and a swingarm on this bike also. Just not having any luck with this bike. I'd say find a new frame.

I have broken two chain guides off the swingarms on two different bikes, a 2010 and 2012 YZ 450F. Neither was covered, unless it happened in the 30 day period after I bought my bike. The small ding on the chainguide came form the chain after the guide broke off. I ride MX, so I didn't hit a downed tree or go through a rock garden. My older bike is in the background with the repair already done to it,

2012-05-11_18-21-02_448.jpg

Edited by Greg Pennsiltucky Lykens

Wow, glad I read this thread. Guess a new YZ 450 is off the list !!

I wouldn't worry too much over the matter, frankly. Cracked frames resulting from extreme use are common to virtually every brand, aluminum or steel. Nothing is completely indestructible, and, not to offend anyone, but there are some people who just have a kind of knack. It's inarguable that a very large majority of YZ's in service never suffer this.

Regarding the chain guide, I've never seen one just break off on its own like that (on any bike, much less a YZ) without being taken off by the failure of an improperly maintained or adjusted chain, or by striking a rock at speed. The dent on the leading edge of the guide shown does not look like it was caused by a chain, IMO.

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