Join Date: Aug 2003
Location: Cincinnati, OH, USA
Surge in RPM's when idle.....
Awhile back I posted about a problem I was having with my 03 GT.
On a recent trip back from Florida, I began to experience what I can only describe as surging of the bike - which I (apparently) incorrectly thought was due to low fuel in the tank.
Anyway, over the period of a week, I experienced a problem in which the bike would surge in RPMs from around 1000-3000 rpms very erratically. I've pretty much not been able to nail down any coherent set of events that correlate between the incidents. Speed, temperature, gas level all appear to not matter.
I've had the surging happen at slow speeds or at a stop. On an empty tank or a full tank. Warm or cold. I can't seem to recall if it's happened when the bike is cold, but it's happened frequently when on 30-40 min+ rides.
On the way home from Florida, I put in some Techron to clean the injectors, ran different grades of fuel (from 89 to 93), etc. It seemed to clear things up..... And then.....
Last week, the dealer checked out the bike, and changed the fuel filter. They couldn't replicate the problem (and to be honest - I hadn't had that problem either).
Today, I was riding home from work. Conditions - 35 degrees, ~50 miles on the tank, ~50 mile ride. I pulled off the exit ramp, had the clutch lever pulled in, bike was in 1st gear. It started to surge from idle to 2000 rpms. Bike didn't stall, but the light changed before I could check. I got home (about ~2 miles away), and it idled fine.
Any ideas as to what might possibly be at issue here? The bike runs fine at speed and I'm slightly annoyed at this erratic problem.
2003 BMW K1200GT (Orient Blue) (Fast)
1982 Honda MB5 (Not So Fast)
"This motorcycle is simply too goddamn fast to ride at speed in any kind of normal road traffic unless you're ready to go straight down the centerline with your nuts on fire and a silent scream in your throat."
- Hunter S. Thompson