Join Date: May 2011
Location: Syracuse, NY USA
Thanked 447 Times in 307 Posts
A stock CBR250R is never cold blooded. The fuel injection is always perfect. I have ridden my bike at 20F and it starts first crank and runs perfect right from the first second. Your aftermarket exhaust is messsing up the mixture. You might also find that they modified some of the other emission control components. You might better go through the bike with an oil change and to check the air filter, valve clearance, and spark plug. Who knows what care it has had or what they did to it.
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