Quote:
Originally Posted by rgx107
I have had the same experience on two occassions. First when I hadn't cleaned the air filter in maybe 30 000 km (yes, my bike doesn't get enough attention). You might want to double check the workshops work, and I also think that on roads like ours the filter can fill up quickly with dirt. Especially in winter, with lots of grease and sludge.
The second experience is right now, I have a problem with the charging so voltage is low. I thought it was the battery so replaced it, it wasn't the battery but the bike ran stronger for a while. So check your charging voltage, it's a simple test. The ECU should compensate for lower voltage but it seems it doesn't fully, or quickly enough when the voltage varies due to bad charging.
There are people reporting improved performance after valve adjustment, I don't understand how. When adjusting the valves you normally make them looser, meaning less valve lift and less duration. But we are talking very small differences, maybe 0.1 mm lower lift. In any case, the bike would be very slightly slower after adjustment at least at high revs.
A third possibility is that the spark plugs are worn out, you don't mention them. The original plugs shouldn't last more than 40000 km. The manual says to replace them every 12000 km.
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I had the bike serviced at CJ Motorteknik in Østersund, Sweden, last week. (I live less than 1 hours drive from the border).
The 250 ran much better after that, as if the power had increased by 10-20 %
since the day before. I could especially feel this at low rpms.
There was no valve adjustment performed, but the spark plugs were changed.
I was also told that the air filter had been cleaned, as it was in a bad state.
I saw one of the old spark plugs myself, and it was very dark, as if it had had
too little air (?).
Therefore I'm not convinced that these parts were properly taken care of at
earlier services, since i have had the bike serviced every 6000 km (about 3500 miles).
Anyway, this was probably what made the huge difference. Engine oil was also replaced. I had to go back to the workshop the next day, due to an overfilling
of engine oil of maybe 1 litre (!).
When the bike had only a few thousand miles on the odometer, I reached
about 155 km/h (96 mph) indicated. Now I hardly got 150 km/h going slightly downhill.. So, after all it seems like the engine has lost some of it's
maximum power after 43000 km, but I guess that's normal.