Q Why is my bike turning into such a greedy gas guzzler?
I ride a 2006 Yamaha FZ6 Fazer and usually get between 150-175 miles out of the tank before I hit reserve. However, in the last few weeks I’ve noticed a steady drop in my mpg and today my reserve indicator started flashing at a mere 104 miles. I had my fuel injectors balanced a while back because of an excessive ticking noise. The ticking has since returned but it’s not as loud as it used to be. Do you think my injector balance was not performed correctly and now the bike’s running too rich or could it be something mechanical? George Crawford, Glasgow
Answered by Charles Marvell, Flitwick Motorcycles It’s the throttle bodies that were adjusted to get the bike running sweetly and the ticking noise is either the clutch or primary drive gear protesting when they go out of balance again and make the engine run roughly. But they will not affect the fuel consumption.
It may be the tank sensor, as they are not the most accurate of things. The only way to know for sure is to brim the tank, note the mileage, do the miles, brim it again and do the maths.
If the air filter has become clogged up that will make it run rich, either from crud, or because water has got in there, maybe from a pressure washer. If that’s clear, then it’s possible the fuel pump regulator has become faulty and is over-pressuring the fuel rail. That’s a 15-minute job for a dealer to check with a gauge on the fuel line. Or it could be that the CO settings have been maladjusted, as you can do this using the select and reset buttons on the dash.