Join Date: Apr 2010
Location: Quartzsite Az,/ Picton, On
Yes, the 539 is a bigger cam than the 540 so will mostly be run as the exhaust in that combo. Less duration will give you more power at low rpm and less at high. More duration bleeds off pressure making it easier on the starter in a high compression situation. My 536/536 combo gives instant response on the trail from any rpm, but was tough to start in my 462 till I lowered the compression.
2007 LTZ 400.. 94mm J&E piston, +4mm hotrods crank, 536webb cams,wiseco valves, 39mm fcr, tokyo mods throttle spring, honda thumb throttle,spring removed. yoshimura full exhaust, honda 400ex intake tube, no air box