- Tue Jan 07, 2020 5:34 pm
#87120
My 2015 Classic EFI has a problem with damp winter mornings. Starts OK, I warm it up for 5 minutes or so, then set out. First few minutes, everything is ticking along normally, then about 5 minutes into the ride, it starts to cough, sputter, lose power and backfire. Sometimes stalls out completely. If I can keep it running, this all ends a couple of minutes later and it runs like a top for the rest of the day. Been doing this for two winters now. Never a problem in warm weather. Any ideas? Just had a service, new plug, HT lead fine, using Esso 97 Octane. Very puzzling.