BradT Posted April 24, 2008 Share #1 Posted April 24, 2008 Can someone tell me what the difference is (besides the number). Spark plugs DPR8EA-9 and DPR7EA-9 The plugs I removed from the bike were with the "7", they look almost identical. Also why would you use one vs the other. ? Brad Link to comment Share on other sites More sharing options...
Cutty Posted April 24, 2008 Share #2 Posted April 24, 2008 Can someone tell me what the difference is (besides the number). Spark plugs DPR8EA-9 and DPR7EA-9 The plugs I removed from the bike were with the "7", they look almost identical. Also why would you use one vs the other. ? Brad The 7 plug is a hotter range plug. Jetting is one reason to change, sometimes if running to rich a hotter plug might correct your performance and to lean a colder plug could be the answer. Always check air filter first as this might be the main problem. Link to comment Share on other sites More sharing options...
BradT Posted April 24, 2008 Author Share #3 Posted April 24, 2008 Thanks. Seemed to run smoother with the 7 (hotter) plugs than the 8. Air filters were just cleaned as well. Do not think the gas mileage is affected. Brad Link to comment Share on other sites More sharing options...
gibvel Posted April 24, 2008 Share #4 Posted April 24, 2008 Brad, Everything you ever wanted to know about NGK spark plug numbering: http://www.spark-plugs.co.uk/pages/technical/ngkjpg.htm Link to comment Share on other sites More sharing options...
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