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A friend of mine just picked up a 98 670 MXZ 670 with 2200 miles. The sled is in nice shape. He asked me to help him get the thing running right. Here is the problem. It will only rev to about 5500 rpm and starts to bog. If you crank on it WFO it actually looses rpm. Acts like it's pushing way too much gas through the motor. I pulled the carbs and they were pretty green inside. Soaked and cleaned the carbs, put new needle and seats in. I started thinking bad fuel pump so I pulled the impulse line on fuel pump. No fuel in the impulse line. It has 145 to 150 lbs of compression. cleaned exhaust valves. Nothing I have done has changed the way it runs. I'm open to any suggestions on what could be causing this issue. thanks
 
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