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I have an '03 Fatboy, 60,000 miles, stock carbureted, 103", Andrews 303 cams, Freds Heads, ignition module, true dual exhaust, K&N filter, hi volume oil pump, .185 main jet, .48 pilot jet. Recently moved to Az. and find that when the temps. rise above 100 my bike pings like crazy in 5th gear, ~2800 RPM's, 70 MPH. It will ping in lower gears and slower speeds, but is not quite so pronounced. I run 91 octane (highest available here), turned down advance on ignition module, upped the pilot jet 1 size to .50, tried octane booster (seems to help slightly), tried adding Marvel Mystery Oil to fuel, 2 oz./5 gal fuel as recommended by the local HD riders (doesn't seem to help). Problem seems to be when air temp rises, fuel mixture gets lean. Any suggestions on tuning/jetting changes that might help?

Thanks in advance for your help!!!
 
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