Bike snaps in half & sets on fire!

yota
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yota 4/27/2010 9:26am
4/27/2010 9:26am Edited Date/Time 4/17/2016 10:26pm
When using a billet "Y" it needs to be mortised into the other frame members, not just butt welded.



IceMan446
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IceMan446 4/27/2010 9:52am
4/27/2010 9:52am
I broke the frame on my YZ80 in the same place and that frame was straight from the factory. I've see a suzuki frame crack on both sides right under the foot peg mounts. So it can happen just faulty material or bad weld job.
Chris_ONeal
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Chris_ONeal 4/27/2010 10:08am
4/27/2010 10:08am
I saw a freestyle rider from Arizona named Trey Deane land off a ramp and his bike snapped right in half. It was the 1999 CR250. The radiator shrouds had actually cut through the frame from rubbing on it. When the bike folded up he crashed hard but the one piece radiator split and sprayed hot coolant all over him. Someone has is on tape it was crazy!
Tiki
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Tiki 4/27/2010 10:16am
4/27/2010 10:16am
kopfjaeger wrote:
May be wrong but, I dont think anyone cuts or welds the spars????? Lucky he is still walking
Pat327 wrote:
You're right. Nobody cuts the spars, but you do have to cut the Y section and at least part of the engine cradle on the '04-'09...
You're right. Nobody cuts the spars, but you do have to cut the Y section and at least part of the engine cradle on the '04-'09 CRF250 chassis. Some people elect to cut the entire engine cradle off and make a new one. Homebuilt conversions can be a bit on the dodgy side sometimes and I would think that the most likely place for them to fail is at the Y section. Once that happens, the bike just breaks in half as the spars flex well past their limit and snap.
I had noticed the spars snapped as well. I am gathering that was the weakest point if one could be identified. It looks like they snapped just below the upper frame gussets. They sure snapped clean

Thanks Pie8man

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ehr400
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ehr400 4/27/2010 10:23am
4/27/2010 10:23am
Hey Yota you aint kidding when the frame gets back from being aged and sprayed it looks like it was sitting in the back of my truck all winter here in Michigan! Mine looked the same way. The "Y" is the most critical when doing the conversion.

Also if the "Y" did fail he must have broke the bolt or the head stay that ties the top of the frame to the motor. Either way not good. Definitly wouldnt want to be on it.
pie8man
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pie8man 4/27/2010 10:31am
4/27/2010 10:31am
Keep in mind that this can easily happen if engine bolts are loose/ missing or have rattled out... It is a 2 stroke!!! DOH!!!
Conversion or not check your nuts!! Motor mounts that is.
AJ
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AJ 4/27/2010 10:51am
4/27/2010 10:51am

That bike is not a Service Honda 500AF.

Glad the rider is ok.






Trent179
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Trent179 4/27/2010 10:54am
4/27/2010 10:54am
Did he over jump something or what? That seems really harsh!
robkinuk
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robkinuk 4/27/2010 10:58am
4/27/2010 10:58am
Trent179 wrote:
Did he over jump something or what? That seems really harsh!
Not really, it's a big table top that he downsided, the bike then folded on the flat!
yota
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yota 4/27/2010 11:25am
4/27/2010 11:25am
absolutely are issues with the rad wings rubbing on the spars, mine has marks from this.
2T42
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2T42 4/27/2010 11:49am
4/27/2010 11:49am
Wow. I thought this was going to be a silly thread on that motocross movie where the racers were crashing and bikes catching fire at every turn! I have never seen this happen. Ever. what a fluke.

More of a reason to buy a true Service AF!... or a KTM. By the way AJ. I have always wanted to tell you this in person, but since you are on this thread... You are the MAN. Anyone who 'properly' stuffs 500 motors into modern chassis is my hero. I will have a Service 500AF in due time, and when I do, it will be the only bike i never sell.
englishman
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englishman 4/27/2010 3:13pm
4/27/2010 3:13pm Edited Date/Time 4/17/2016 10:26pm
robkinuk wrote:
IMG]http://i261.photobucket.com/albums/ii59/robkinuk/DSC_0016.jpg[/IMG] I was commentating at last weekends National Two Stroke championship round at Doncaster England. In the 500cc class this rider on a 500cc Honda jumped...

IMG]http://i261.photobucket.com/albums/ii59/robkinuk/DSC_0016.jpg[/IMG]


I was commentating at last weekends National Two Stroke championship round at Doncaster England. In the 500cc class this rider on a 500cc Honda jumped the massive table top. Upon landing the bike snapped in half, ripping out the fuel pipe and the bike burst into flames!Shocked
I've never seen that in 30 years of attending motocross races.
They tried chucking sand onto flames then one brave specatator grabbed the front half of bike and dragged it into a nearby pond.
The rider escaped without injury but the bike was worse for wear!
Photos by Bryan Atkinson.
How the hell did you get that in and out of the washing machine ?


Did a nice job though , presuming you didn't do it on the hot cycle so as not to f up the heat treating?
Torco1
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Torco1 4/27/2010 3:22pm
4/27/2010 3:22pm
Looks like an insurance scam to me. Whistling
sbarrington314 4/27/2010 3:46pm
4/27/2010 3:46pm
probably has something to do with that giant exhaust can thing hanging off the bike. what is that thing?
Torco1
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Torco1 4/27/2010 3:51pm
4/27/2010 3:51pm
sbarrington314 wrote:
probably has something to do with that giant exhaust can thing hanging off the bike. what is that thing?
Do you mean that big metal slug looking thing that is trying to eat the bike?

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MXEditor
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MXEditor 4/27/2010 3:59pm
4/27/2010 3:59pm Edited Date/Time 4/17/2016 10:26pm
Here is Jared Jenning's Cobra after a big jump at Walden Playboys in NY....back in the day...I saw this happen but there was no fire! Booo!

And no he was not hurt. Just saw him ripping it up 2 weeks ago.

MoToJeWeL
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MoToJeWeL 4/27/2010 4:53pm
4/27/2010 4:53pm
AJ wrote:

That bike is not a Service Honda 500AF.

Glad the rider is ok.






AJ!Cool
yota
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yota 4/28/2010 3:51am
4/28/2010 3:51am Edited Date/Time 4/17/2016 10:27pm
nothing wrong with Cromoly. the steel one even has the footpegs still on it.




onenastynotch
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onenastynotch 4/28/2010 4:22am
4/28/2010 4:22am
Chili wrote:
Rob do you know this is a Service bike as fact? Just hate to see their name in this thread if this is someone elses conversion.
where in the thread did he state it wa a service honda? alot of people do the conversion themselves....
sixdayguy
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sixdayguy 4/28/2010 4:42am
4/28/2010 4:42am
I believe the real reason the big 4 went to aluminum frames was that they are cheaper to manufacture, fewer welds, ect. Cheaper to make and with a higher pro-sieved value, its win-win for the manufactures. Give me a good steel bike any day!
Chili
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Chili 4/28/2010 6:28am
4/28/2010 6:28am
Chili wrote:
Rob do you know this is a Service bike as fact? Just hate to see their name in this thread if this is someone elses conversion.
onenastynotch wrote:
where in the thread did he state it wa a service honda? alot of people do the conversion themselves....
It was in his original post which he respectfully edited after I asked him the question.

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