I've got a 250ES big red and when i just start it up or even after it has been ridden for a while when i hammer the throttle while in neutral it just kills itself down. I was wondering if it could be my head gasket (cuz it is cracked) or something on my carb. Help would be much appreciated. Thank you.

 

try adjusting your air screw on your carb. It has a big roll in throttle response.

 

Are you positive its not my head gasket? And how much should the carb screw be adjusted? Please respond.

 

Is there air blowing out of the head gasket?? If there is there will be a big loss in compression witch will lead to loss in throttle response and overall power. If it looks like theres no air coming out or being sucked in then your carb probably needs to be adjusted...

If air is blowing out or sucking in just replace the gasket.

P.S- Usually air screws should be about 1 1/2 tunrs OUT

 

on your carb problen i had one do the same thing it waqs the choke it looked like it was released all the way but it wasent un screw from carb and clean it i think that will fix your prob if not e-mail me we will fig something out.


proud owner
5 250sx
1 250es
1 250r
1 185
1 200s
1/2 250sx still building

 

Some things to consider. Pilot jet may be partialy plugged. Air screw in need of adjustment. Old gas, and or, water in the gas. Ive seen many bikes come and go with either one or more of these problems that had a bog right off throttle valve pickup