The timing chain on the Prarie decided to grenade on me today. I had previously rebuilt the engine with new piston+rings, seals, and new intake/exhaust valves. After the rebuild, I made sure everything was spec. but still heard almost a sound like somebody blowing in a tube, coming from the exhaust valve. x2 checked that it was in spec and had it running with the sound gone away for the most part. After 5 minutes of riding, i heard a snap and the machine died and would not start. Timing chain grenaded and did a ton of damage. Could this be cuased by valves being too tight? What is the likelyhood that my new piston slammed the valve? Am i looking at just a new timing chain or a new rebuild? Thanks for the help.