Is it over heating??

[travellukie]

Hi, I need help, I cant get it from local mechanics...!!

 I recently bought a 250Bandit (1994 I think) 2 weeks ago. I am living in Japan on a 12 month exchange programme and bought the bike for a daily runner and also so I could go away on short trips and tour Japan. My Japanese is poor, and i find it impossible to talk with mechanics here..

I have found two or three problems in the last week, I went away on a 10 day tour, and I had these problems, maybe they all relate to one problem and I was hoping someone out there can help me and give me a few solutions..

It seems to run perfectly early in the mornings and at night when its cold, so I thought it might be a over heating problem, but even sometimes in the morning and thirty minutes of riding it starts to run bad, as i wait at at the traffic lights, it idles fine but when i go to take off, nothing happens and when I pull back on the throttle there is no power, and slowly it buiulds up rpm:s and then I can take off... This happens regulary, it also has a strange muffled noise coming form the exhaust in the 1st 2nd and 3rd gears. It always workks fine in high rpm;s . If I rev the shit out of it in 1st gear when I take off it works too, but this is not what I want..

I am getting terrible milage due to revving it so much.

The other problem was I had to ride over the mountains here, which can be quite high and I think it was getting quite hot (the motor), then the motor just stopped, it would idle in neutrel but as soon as you put into gear it would cut out...  as soon as I turned the bike around and went down hill for a few hundred metres it worked fine and then I would turn around and keep going up until the same thing happened..

Can anyone help me out there, any help would be very appreciated..

Two mechanics that I spoke to gave no help at all, One had no idea what it was and the other told me because I had a tank bag on, it was stopping the air going down into the petrol tank and causing a lack of air/petrol mix into the carbie.. I just cant see this happening..!! I have had tank bags on all my bikes and never had this problem..

cheers travellukie

[echomadman]

could be loads of things, my bike did something similar when i got it, a carb clean and a change of spark plugs fixed it.

you have to rev the shit out of the b250 to get it to do anything, thats the nature of the bike.

I'd start by having a look at your plugs and your air filter.