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I bought a new 2006 Kawasaki Ninja 250R two months ago and have put about 300 miles on it. I need help in answering some questions:
1. Is that common for the bike's engine to get "cold" so fast? I just used it then park it for about 3 hours. Somehow, I still need use choke to start the bike for at least 5 - 10 min. The longer I leave the bike, the longer I need to put the choke on.
2. Is that because my bike still new? or something wrong with it? It happened since I bought it. Please advice. Thank you in advance.

You should only have to choke a bike for 3 minutes... even in freezing cold weather. Have it checked out.

Thanks. If I put he choke back off before the temp goes in the middle of Cold and Hot, the engine will go off like not enough throttle.

I rarely use the choke unless I haven't started the bike in a few days. Of course, I'm at a higher elevation (4200' above sea level) but even at 500' above sea level I rarely use the choke.

Sounds like a couple things are wrong... first, maybe the carbs are wrong (misadjusted or defective or something)... second, 300 miles in two months???

300 mi in two months? Is that too much or too little? When I bought it from the previous owner, he already put 150 mi on it. I very seldom ride it since the weather too hot.

I've had my '06 ninja 250 for three months and it now has over 7000 miles on it.

whatever miles you put on it are fine. some folks out there might call you a "fair weather rider" but to me, the key is that you are a rider. as you gain more skills and confidence, the miles will add up on their own.

dieziege uses his to commute and is having a blast on his, so his mileage and yours won't mesh because your situation might be totally different. for me i'd ride more but i can't commute every day due to carpooling, and then helping out a few days a week at the motorcycle school, so i don't get to put on as many miles as some other riders.

i take my 05 ninja on a long ride every weekend. the first time i start it up every weekend i put on the choke for about 30 seconds or more while i put on my gear ..and throughout the day it starts up with a push of the button. so i think there may be something wrong with your bike

I'm the first to admit my bike wouldn't have anywhere near its mileage if I wasn't a little insane...maybe strike the 'little' from that sentence but you get the idea. I still think 300 is just, well... a bit too extreme on the other side of things. Get out and ride!

Seriously, the bike isn't broken in... my bike had a number of odd behaviors (e.g. the idle speed was impossible to set, jumping 300RPM at times) that went away after 1000 miles or so.

In fact, strike what I said about the possible problem... I'm willing to bet the issue is the lousy factory carb synch and valve setting. My valves were set screwy from the factory, and my bike ran poorly and was hard to start until the carbs were synched. That doesn't happen until the 500 mile service, which hasn't happened yet. On my bike that was so long ago now that I wasn't even thinking about it, but it was a bit finicky for the first few hundred miles.

So get out and ride more... then do the 500 mile service... then see how it runs.

Thank You for all the advie. I will ride it more and get it check out tomorrow.