Join Date: May 2005
Location: Wilmington, DE, USA
DL1000K3, Power Commander III, Secondaries out, backfires...
I recently installed a Power Commander III USB in my DL1000K3. I am using the M311-001 map - 02-03 Model for Completely Stock Bike. This map checks out with the computer, both cylinders are mapped the same.
I wasn't completely satisfied, it seemed to lack the old punchy acceleration, so I yanked the secondary butterfly valves.
Wow! What a difference! Bike now pulls from 1500 to 9500. It is smooth the whole way up. It is just a smidge rough at 3000-4000, a really small smidge. At 4000-7000 it's like an electric engine, then gets a bet fiesty. Acceleration is far better than brisk. I'm happy.
Gas mileage went from 41mpg to 43mpg for same riding conditions. Not bad, better performance, better mileage, such a deal!
However, there is a "fly in the ointment". I occassionally get a small backfire, especially when the bike is hot (3 bars). This occurs at low rpms, when I start a slow acceleration. There seems to be a lull in the engine just before the backfire.
I'm running the idle about 1400 to keep it from stalling. I may be able to lower it. I set it before PCIII and removing the secondaries.
Any ideas on how to fix this backfiring?