Question about 1999 Yamaha YZF-R1
Take out the plugs and "read"them,this will instantly tell you wether it's a lean or rich misfire,beyond that look at the gaps,use a snap on or similar timing light that reads out igniton voltage,then look at moving parts that wear such as TPS sensor,it may have codes that can be read by a scan tool
Posted on Apr 03, 2015
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Posted on Jan 02, 2017
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