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Hi I bought a 2012 YFZ and is running great and all that no problem but I got a sound that I dont think is normal I don't know if is valve or something else
 

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YFZ’s have a lot of unusual sounds, I came from a raptor and I swore my yfz engine was messed up because it was so loud. I’ve gotten use to it now, titanium valves are loud.

My rule of thumb is: If it runs and rides, it ain’t broke
 

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Coming from a Z400 to a yfz450r THE YFZ450R idling sounds like its gonna blow and the piston and conrod gonna shoot up through gas tank. BUT IT RIDES NICE WHEN YOU GET ON THE THROTTLE PULLS AND PULLS..
 
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