Post by mrboo on May 10, 2016 20:20:53 GMT -5
Had a similar problem with my 2013 evo150, turned out the " emissions " or PAIR system had malfunctioned and caused a 1/2 throttle or more vacuum leak ( severe lean condition ). The easiest way to determine if this is your problem - find the fresh air intake hose sticking down beside the engine not connected on the bottom ( about 3/8" id ), with scooter running there should be no flow coming out, it will feel like light puffs. If there is some flow plug it off and take it for a spin, fixed mine instantly. Probably reed valve in PAIR system went south. Hope it helps. VERY frustrating to find if not looking for. Plugging system is not the correct fix but if it works at least you will know where to look.