I have a 2004 yfz 450 and in the passed 4 rides (about 2 hours long each), one of my valves has stayed down and been broken when the piston came back up and made contact with it. After putting it back together the first time i checked numerous times to make sure timing, valve movement, and camshaft movement were all correct. and just 2 rides later (today) the same thing happened again. I have not began work on it yet so i do not know if it is the same valve. But has anyone ever had this problem before? Is this something frequent with yfz's or am i missing an important maintence issue? And can anyone tell me why this is happening? All help and tips are much appreciated!! Thanks!!
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A mild heart valve problem usually doesn't require any intervention. A severe one requires surgery (no way around it) In mild cases, you'd be monitored during your check ups to see whether it's progressed.
Cure is a cardiologist or a cardiac surgeon. A heart valve problem isn't necessarily something that can be cured without surgery. Hell I'm a holistic healer training to be a midwife- I pretty much only ever promote or use natural medicine, and even I would never recommend against what your doctor has told you for this. Mind you I grew up with two cardiac specialist for parents so I know that when it comes to heart problems, natural medicine doesn't really cut it in many cases. Often, by the time the problem creates noticeable symptoms, you get it checked out and diagnosed, it's often too late to take just natural steps to correct it. Trust your doctor. Talk to him about your concerns and have him help you combine natural means into your treatment and recovery. What you are wanting to do will go a long way to helping you recover and lead a pretty normal life.
This Site Might Help You. RE: 2004 yfz450 valve problem. Need Help!!!? I have a 2004 yfz 450 and in the passed 4 rides (about 2 hours long each), one of my valves has stayed down and been broken when the piston came back up and made contact with it. After putting it back together the first time i checked numerous times to make sure timing, valve movement, and...
Valve guides wear and get loose, so the valve stem binding up in them is highly unlikely. If the guides are shot, they should be replaceable. Sometimes valve stems warp and will cause your problem, but the odds of it happening a second time are also unlikely. Once you tear into it, I guess the deciding factor will be if it's the same valve or a different one. When this happened, were your rpm's high or otherwise? I ask because if when high, I'd check for a broken or weak valve spring/s. Most have one spring inside of another to reduce harmonic vibrations and if the inside is broken, not only will you not have adequate spring resistance for high rpm running, but at a certain rpm the remaining spring will be quivering like a dog pooping peach seeds. The other thing that may have happened is the camchain tensioner isn't locking tightly. If so, that would let the chain jump a tooth or two and then Mr. Piston and Mr. Valve get into hand to hand combat. The old 6 cylinder Kawasakis were well known for having crappy tensioners that would do just that. However, with them, it usually happened during startup. Or, you may have had a camchain guide fail and with it laying in the bottom of the oil pan,the tensioner isn't able to take up all the slack in the chain. When you get it apart, let us know what you find because I suspect you need to be looking for the cause of the bent valve somewhere else than the valve itself.
