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Old 11-12-2012, 07:05 PM   #1 (permalink)
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Default Weather finally got into the 30's, bike sounds strange?

this morning when i road to work, it was about 34 degrees outside, and the bike seemed to run fine. but on the ride home (temp about 60) the bike sounded strange. the exhaust seemed to have a deeper tone to it, and the motor itself just seemed to have a slightly deeper rumble all around. any ideas what could cause this?
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Old 11-12-2012, 07:10 PM   #2 (permalink)
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I think you are just overthinking things. It seems very normal besides the exhaust sound
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Old 11-12-2012, 07:38 PM   #3 (permalink)
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I'll see how it acts tommorow, it could all be in my head. after all the random little problems this bike has given me due to poor maintenance by its original owner, every little thing makes me paranoid.
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Old 11-12-2012, 07:38 PM   #4 (permalink)
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cold weather is dense. probably ran a tad leaner so the motor LIKED it. may have cleaned it out a bit.

or you're just over-thinking things.
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Old 11-13-2012, 12:48 AM   #5 (permalink)
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There are many factors that will change the performance of the engine. Altitude, air temperature, and humidity are big factors that will affect how an engine will run. Air density increases as air gets colder. This means that there are more oxygen molecules in the same space when the air is cold. When the temperature drops, the engine will run leaner and more fuel will have to be added to compensate. When the air temperature gets warmer, the engine will run richer and less fuel will be needed. An engine that is jetted at warmer temps may run poorly when the temperature is colder and vice verus.

The bike will actually run better up top with a little extra oxygen. However you do want to be careful at freezing temps.The Ninja 250 is susceptible to carb icing in certain conditions. For the Ninja 250, it appears that the range of about 20 F to 50 F (-7 C to +10 C) with visible moisture (fog or rain) can cause carb ice. Pod air filters may exacerbate the problem, since they can allow more moisture into the carbs than the stock airbox.
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Old 11-13-2012, 07:36 PM   #6 (permalink)
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Well i found the problem, Exhaust manifold was loose.
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Old 11-13-2012, 07:38 PM   #7 (permalink)
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How the hell did that happen?
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Old 11-13-2012, 07:44 PM   #8 (permalink)
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thats a damn good question. i suspect the original owner never tightened them properly. (this bike has a very long history of small problems due to incredibly poor maintenance by the previous owner
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