EFI Speedmaster Jerky under 25mph
I've been fighting with commuter drive-ability on my new to me 2012 speedmaster since purchase a month ago.
The problem rears it's ugly head when driving under 25 freedom units per hour, in 1st or 2nd gear which puts me around 3-4k rpm, 3rd gear is too low for the speed.
On a dead cold start the problem will not be present, but 5-10 minutes into a drive it becomes apparent.
Symptoms are a vigorous jerky give and take at a steady 1/8th throttle input.
I can roll on/off throttle without fuss, but maintaining a smooth consistent pace is not possible.
This bike has always had this along with terrible throttle snatch.
The throttle snatch was cured by tightening the chain, re-enforcing the cush drive, a TTP stage 1 tune/filter, but not the symptoms as stated.
Currently the bike has AIS and O2 lines/sensors removed and plugged. no CEL's.
So far I have synced the throttle bodies various times, ran adaptations, set TPS, raised and lowered TPS voltage.
Outside of the stated problem, the bike runs terrific. 40 mpg across the board, no backfires, no problems starting...
It's the slow speed traffic that is killing the experience.
I am out of ideas, willing to try anything to clean out the demons.