I would be hesitant to buy any 2-cycle engine that may have been sprayed internal with brake cleaner. Bogging did occur with older motors if throttle was applied too quickly.
Guessing that it stopped either do to a weak battery or the fuel pump needs rebuilding. The rebuild kit is cheap.
If everyone near you are racing motors that have been upgraded to an EVO, you will be at a disadvantage. Check first. Also find out how long ago the motor has been serviced.
LAD Specialties customer / tony kart / rotax / kt100