Guest rwalker Posted July 26, 2008 Share #1 Posted July 26, 2008 I have a '92 VR. I removed a plug just to check wear and condition and discovered the plug does not match the number listed in the shop manual for the bike: The spark plug was an NGK DPR7EA-9. According to the manual, it should be an NGK DPR8EA-9. I'm assuming this means the plugs in the bike are a lower heat range...? Would this make a difference in performance, especially start/cold performance. The bike runs like it is firing on two cylinders until it gets warm, sometimes. Should I change to the DPR8EA-9 part number plugs? Thanks, Randy Link to comment Share on other sites More sharing options...
GeorgeS Posted July 26, 2008 Share #2 Posted July 26, 2008 Yes, use the Stock Number. Most everybody agrees that the stock NGK is the right number to use. Link to comment Share on other sites More sharing options...
cmiles3 Posted July 27, 2008 Share #3 Posted July 27, 2008 Just changed mine with stock NGK's today. It's been at least 4 years & 40,000 miles; don't know when the PO changed them last. They looked ready to run another 4 years; gap was correct, light tan color. Only issue I spotted was one of the boots looked funky; wires & boots next? Link to comment Share on other sites More sharing options...
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