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Dirt Bike Mods & Maintenance
Spark Plug indexing
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[QUOTE="Rich Rohrich, post: 614035, member: 16241"] Modern four-stroke race engines with narrow valve included angles have combustion chambers that promote high degrees of mixture motion and leave the sparkplug eseentially unshrouded. Old style high compression wedge cylinder heads had shrouding and clearance issues to contend with which made indexing a necessity in many cases to keep the ground strap from being hammered. I've never seen any [b]properly controlled[/b] test results published that would lead me to believe indexing plugs provides any advantage in a modern engine and I've never personally been able to measure a difference on a modern fourstroke. The same held true for me in air cooled RD350s at the drag strip. [/QUOTE]
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MX, SX & Off-Road Discussions
Dirt Bike Mods & Maintenance
Spark Plug indexing
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