Looking for some help with this one. My son was riding his DS 90 2 stoke in snowy cold weather. After about an hour it lost all power. Now it starts great, but as soon I give it some throttle, it bogs down and can barely move it`s own weight. Any Ideas?? Never ever a problem before.

Does any know how to remove the Carb on this unit?

 

First thing to do before removing the carb is to remove the end cap from the exhaust. There are three screws that hold it on. Under the cap is a spark arrester screen. More than likely the screen is plugged not allowing exhaust to escape causing the machine to die when the throttle is applied.

If the screen is ok and carb removal is the next step, good luck. They are a little tricky w/ the boot on them. On some of the DS 90 and 50 models, it helps to remove the airbox first, just two bolts. You will then have to fight the black boot that covers the carb when trying to remove it. Unscrew the clamp holding it to the motor, unhook the oil line and remove the screws that hold the slide and cable to the top of the carb.

 

Thanks for the help. I don`t think it is the exhaust, as there seems to be plenty of exhaust coming out, but I will check it. The machine does not die at full throttle, it just bogs down and loses all power. Could the automatic choke be stuck open some how since it seems to start and idle just fine?

I am really avoiding the carb removal, but probbaly the best way to diagnose. Is that the oil line coming into the front of the Carb? How is that line removed as it seems like it is pretty solid in there and I can't see the other end of it?

 

Thanks 1988trx250r, you were absolutely correct with your diagnosis. When I removed the spark arrestor, it was completely plugged. It ran like a charm with it off. I am glad I tried that before removing that Carb.

Once again, thanks so much.