I ride the VStrom to work every day. For over a year now its been backfiring when letting off the throttle. I know most of the places during my commute where the loudest bangs will happen. For example , there is a long straight coming down Rt128 past the Mass pike exit that ends in a traffic jam as the Pike traffic merges with Rt128. As I go under the overpass, that nice covered area is usually where I let off the throttle and "BAM!!" the exhaust backfires making cars around me brake, turn their heads, thinking most likely its another terrorist attack
. The backfires seemed to become more frequent as the temps have got warmer but it got the point where I was no longer enjoying the ride anymore. It was backfiring all the time.
I looked into the cause and too much unburnt fuel in the exhaust, too much air (exhaust leak? RAID air system to blame etc etc) were all highlighted as culprits here on this Forum.Blocking off the RAID system and having your Power Commander fiddled with were supposed to cure the issue. I did this (at Harrys Machine Shop) when the bike was dynoed last year and nothing...still backfired like a crazy wild stallion
I rode on and on but wasnt enjoying the experience. Sure sometimes it was fun to scare the clean-cut professional driving his BMW but it got old quick.
Which brings me on to this week...I noticed my idle was low. It was 1000 rpm and the bike sounded like an asthmatic smoker. This had slowly become normal to me. I know VStroms should be set at 1200-1300 rpm. After work one day I upped the idle to 1400-1500 and instantly the thrummy VStrom engine sparked into a new more hurried sounding life. I rode to work that morning. Something was different I thought as I sped up the VFW Parkway. The bike felt peppier and younger than its 45K miles and I remembered the idle adjustment from the previous night. Could it really be that simple?!
I carried on with the commute speeding up and slowing down where I could to see if I could reproduce the backfire that usually announced my arrival through the backstreets of West Newton. Silence. I got out on the highway and came around the large sweeping corner to the long straight that ended with the overpass. I accelerated. Wow that feels good. The 16/43 sprockets, the PC-V map suddenly meant something now. It reminded me of the day I left Rick Stetsons place over a year ago. Traffic ahead, roll of the throttle, slowing down, wait for it....wait for it...here it comes, its building up, almost there, body tenses, teeth clench....and nothing. Really?! Thats it!?
So can someone explain how adjusting the idle can cure the backfire on a DL1000?
Andy in Boston