Quote:
Originally Posted by Norway
In this case, the air filter was relatively recently replaced. It also has fuel injection. It has been standing for about 4 months now, with gasoline being the same age. (I still believe there was no ethanol in this fuel - 98 octane
Shell V-power). The fuel is old, anyway, so it might improve a little bit when getting rid of the old gasoline.
I hope a valve adjustment could help, when (/if) that day comes. Engine runs fine, without any odd noises and no disturbing vibrations. Just feels slightly weaker. Maybe it's normal for a 5 years old 24 000 miles / almost 40 000 km bike.
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There you go. Drain and refill the tank.
Use the lowest octane ethanol-free gas that's recommended in the manual for the most power and economy - which is usually "Regular". "Premium" gas will not make more power or provide noticeable benefits -but at times it's the only way to get ethanol-free gas.
You may also want to run a strong fuel system cleaner like Shell Techron Concentrate (1oz per gal) if it's available. It will clean deposits from the injectors, intake valves, and combustion chambers after a full tank or 2.