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2006 Yamaha YFZ 450 grinding noise

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I just went riding and I noticed there were a few things that were not right with my yfz 450 this trip. The first thing was that when I would be in 3rd, 4th, and 5th gear, I would hear a grinding noise coming from the engine when I had it pinned, and on straight aways, it revved way too high in 5th gear.  I couldn't give it full throttle without it sounding like I was doing a steep hill climb in 1st gear.  and the last thing I noticed was that my coolant tank was bone dry after just filling it up.  I checked for a crack or leak anywhere but could not find anything.  If you know what the problems id appreciate some help finding out what these problems are. thanks

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Did you check your clutch? Sounds like it may be slipping (high revs), a chuck broke off (grinding noise) and those extra revs caused an overheat of the engine (loss of coolant).

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