We limit access by GUESTS to protect our members from spam, hacks and trolls. Please register to gain access to all our resources.
Posted by Fab
- May 13, 2026, 05:17:39 AMI need help from forum members who have more experience than I do.
Here's a brief description of my problem:
I got myself a 2001 Drifter 1500 about a year ago, ans the bike has always been running all too rich:
- very high fuel consumption. Low mileage between 25-30 mpg (11–13 km/l)
- spark plugs fouled with black soot (dry carbon deposits, not oily) that eventually cause misfires and starting problems
- a smell coming from the exhaust and black smoke when revving
Actions taken so far with no results:
- replaced the fuel pressure regulator with a standard one, since the previous owner had installed an FPR with higher pressure
- replaced the vacuum hoses with new ones
- replaced the air temperature sensor, the coolant temperature sensor, and both MAP sensors
- I tried several injector/system cleaners
- I repeatedly removed and cleaned the spark plugs, only to see them get fouled again shortly afterward
- I replaced the spark plugs with new ones - I also tried hotter spark plugs, with no improvement
- The service shop also had the injectors cleaned and tested by a specialized company, as well as they checked and cleaned the fuel pump and fuel filter
- The ECU shows no error messages when following the procedure outlined in the maintenance manual and on this forum
I've run out of options.
Does anyone have any ideas about what I could do next?
Thank you!