sudden loping idle/stall fixed with screwdriver

[yota]

A few weeks ago out of the blue my hyper started to idle very rough, esp at warm up and would stall easily during warm up. Once warmed up no more stall but would ilde rough. after a couple of days of this I turned both throttle body fuel mix screws 1/2 turn richer and it went completely away and has been peachy since. I bring this up only because another hyper owner in my area called and is currently experiencing the same exact symptoms. My bike has 3700 miles on it. I've had the LV system and airbox mod with the race cam ecu installed (without the cams) for about the last 3000 miles, his bike is bone stock with 650 miles on it. When I put the exhaust/ecu in 3K miles ago I had the dealer reset the tps and adjust the CO2 mix. Curious why the change suddenly happened. It was at about the time the weather here changed from super hot/humid to about 80's and dryer but I thought fuel injection was designed to compensate for that stuff. any ideas why my bike leaned out?

[SquireSCA]

Originally Posted by yota

A few weeks ago out of the blue my hyper started to idle very rough, esp at warm up and would stall easily during warm up. Once warmed up no more stall but would ilde rough. after a couple of days of this I turned both throttle body fuel mix screws 1/2 turn richer and it went completely away and has been peachy since. I bring this up only because another hyper owner in my area called and is currently experiencing the same exact symptoms. My bike has 3700 miles on it. I've had the LV system and airbox mod with the race cam ecu installed (without the cams) for about the last 3000 miles, his bike is bone stock with 650 miles on it. When I put the exhaust/ecu in 3K miles ago I had the dealer reset the tps and adjust the CO2 mix. Curious why the change suddenly happened. It was at about the time the weather here changed from super hot/humid to about 80's and dryer but I thought fuel injection was designed to compensate for that stuff. any ideas why my bike leaned out?

If you changed to the cam ECU, then the bike is no longer using the O2 sensor and compensating for those changes.

Get a Power Commander, map it in the hot weather, and then take your map and add a few % to the entire map for the colder weather when the air is denser and the bike wants to lean out.

[GMP]

The air temp sensor in the beak should compensate for temp, but not humidity. If there is suddenly less humidity I can see it getting a bit leaner. How much influence the temp sensor has on the map is anyones guess without actually seeing the map and bias tables. Mine runs really good now, better than ever, now that its cooling off here (50s).

[CDONA]

Oct 1st is when the winter gas blend hits. This has given me fits with my ol '93 carbed fatboy. It seemed to me the oxygenate additive could be blended a bit stronger to mix in gas stations storage tanks. This additive blend is added at the semi/tanker as it is filled from the refinery.