Motor has a Tapping - Yamaha Forums

11-14-2011, 08:38 PM	#1
jvon Join Date: Oct 2010 Posts: 4 Thanks: 0 Thanked 0 Times in 0 Posts	Motor has a Tapping I have a 2008 big bear 400 I just bought. I have new rings(.5mm os) and a new timing chain. When I start the atv it sounds like my 2007 big bear. After it runs for about 20 sec. it starts to tap. I can't tell where it is coming from. It get louder as it runs. Once it gets pretty loud then it doesn't get any louder. The tone changes as you rise the rpms. It sound louder at idle. I am thinking about checking the oil pressure but I am not sure how to do this on a atv. Any help would be great, thanks.

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