Quote:
Originally Posted by Triple Jim
I'm not sure you can define a "normal" cause for an engine reducing its maximum power. Some possibilities include dirty air filter, carburetors not fully opening, improper ignition timing, wrong air/fuel mixture (dirty jets), incorrect valve adjustment, and worn rings and/or cylinders.
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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.