Correct spark plug...?

[Guest rwalker]

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

[GeorgeS]

Yes, use the Stock Number.

 

Most everybody agrees that the stock NGK is the right number to use.

[cmiles3]

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?