I have a 1 year old 250 DT (two stroke). It started running rough just
before the 20 HR check up. The dealer adjusted the Throttle Position
Sensor (or throttle position valve)at that time and the engine ran
great for the next 50 hours.

The engine began to die at low (750 - 1000) RPM and would not start
untill the gas "bulb" was pumped up again.

At the 100 check the dealer found "debris" in the high pressure fuel
pump. However, they did not replace the fuel filter ? They also
adjusted the Throttle Position Sensor again. It runs smoothly at my
house. I have not had chance for all day fishig trip to test it.

My question, is anyone out there familiar to TPS (or throttle valve
sensor). The dealer claims it can be "adjusted" but only by the dealer.
In addition, they say that this is covered by warranty for only 30 days
after purchase ?

Any advise will be appreciated.

SpeckTater