So, as I mentioned in another thread I just purchased a 09 YZF450, with what I was told had less than 5 hours on it (and it looks awesome, perfectly clean, stock plastics look perfect, inside the airbox looks like new, exhaust looks great-no dirt baked on, just about perfectly clean all the way around).
Anyway, I get it home last week. Change the oil, clean the air filter, check the spokes, check the coolant, check all the bolts...rode it up and down the street a couple times anxious for the weekend to take it out (it always started right up, ran perfect, idled perfect), if just felt like a brand new bike. Yes, I was excited.
So saturday comes, I get all my "honey-do's" done in the morning load up the trailer and my two brothers and I hit the road. We drove about 45 minutes to the riding area...unload the trailer, get our gear on. I hop on my new bike, start it up (1st kick) and I'm sitting on it while its idling just letting it warm up. After about a minute or so, it dies. I thought that was weird, so I pull the kick starter out, and go to kick it over and its frozen solid....the kick starter won't budge! The piston is absolutely frozen solid.
Needless to say I'm pretty ticked off!
Hmmm, lost oil flow/pressure for some reason it seems?
Powerband in every gear !
shitty, man. gotta love 'em
now you'll spend more to re-build it that you probably paid for it
Titan.........are you sure you had enough and the right kind of oil in there? If so.....maybe the pump quit working? Sounds like the oil broke down , or a wrist pin clip or bearing may of come loose? Really sorry to hear that.....BUT......at least it did it on the stand....not while you were riding it! Also.....since it was just idling you may not really have any damage or much anyways. Good luck.........it sounds like nothing to major to be honest. Tear that head off and look at what you got.
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thats a sign that says, that bike needs a cr500 motor in it
The only positive thing I can say is at least you don't have the expense of rebuilding the 'top end'. Either way I'm sorry to hear it, no fun for you....
E.A.S.S.C. - as fun as it gets.............
Bummer. The 450 Yamaha has been known to be pretty damn reliable.
That sucks. I would blame it on bad luck rather than 4 strokes or Yamahas. That is a pretty rare occurrence. I haven't wrenched on a 09 YZ450F, but on some bikes you can put the oil filter in backwards if you aren't thinking about it. This blocks oil flow, might be worth checking out.
You mentioned you left it on the stand idling to warm up. It wasn't puking coolant when it died was it? My YZ250F would overheat quick if it wasn't in motion.
Have you opened it up yet? I had the cam chain skip a couple teeth on the exhaust cam on my 06 kx while idling before practice @ Redbud. It felt locked up just like you describe, because the auto-decompression pin was no longer opening exhaust valves slightly on compression stroke. Maybe you'll get lucky and that's all it'll be? I ditched the auto cam chain tensioner, made a manual one, and haven't had a problem since.
Pull the spark plug and see if it will turn over. If it does, you probably just need to re-time the cams.
If it's anything like the ATV engine, the filter will not go in backwards and mine has never boiled over. I've only used it in the dunes and in the summer it's hot as hell out in the sand.
Oil filter facing the wrong direction? Oil stops flowing emediatly...
If my memory serves (and I'm at work and can't check), but it seems like its down right impossible to put the filter in backwards....one side was completely flat if I remember right (I've only done it one time on the bike, so I'm not 100% certain). So I don't think its that (If it is...then, I'm a moron).
I did pull the spark plug when I got home, and it still wouldn't budge.
It wasn't puking coolant when it stalled, it had only idled for maybe 60 seconds.
I hope its just something simple...like the cam chain, or kick starter gears or something. But I'm not thinking that's the case.
Thanks for the condolences and suggestions. I appreciate it.
It happened to me on a 06 crf250.
The thing shit itself after 1 lap and destroyed the engine. £1000 repair bill, ruined my weekend and my wallet.
Hope it's not too bad for you.
I regret my username, I chose it before I realized that the pro 2 stroke crowd on vital mx are completely and utterly insane.
Don't worry about what other people think, they don't do it very often.
If that were an issue with the kick starter gear, you should be able to put it in gear and make the wheel turn, especially if you have the spark plug off.
man who runs in front of bus gets tired. man who runs behind bus gets exhausted
It might be worth it to pull the side covers off before pulling the top end. My friend had an 06 or 07 YZ450F where the bolts came loose on the stator, it cocked sideways, snagged on the flywheel and bound up badly. You couldn't roll it forwards or backwards and the kick starter was stuck. Seemed like it was seized. He did some research and apparently he isn't alone in that happening to YZ450F owners. I also had a KX250F that had the flywheel nut back off and stick against the side cover giving similar symptoms. Both of these problems occurred and pretty much idle rpms. Either way pulling the ignition cover off might be worth the trouble.
Could be a valve that broke. Any smoke come out? Did you hear a rattling cam chain off idle when you rode it down the street? How many hours since rebuild, cam chain replacement/valve replacement? No hour meter on it?
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