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engine oil and 2 stroke are fine and its air cooled so no water and the head gasket is a nice and new same is my carb

im thinking about upgrading to a K&N filter anyway get some more air in and upjet the carb

i looked at all them but i think its my airbox restricting the airflow and its trying to run on pure petrol and 2stroke also its making a horrible noise like its really struggling and the second i let the throttle off it dies, tempermental 2 strokes eh

Hi i recently rebuilt a 1977 DT100 and it was all working fine then 2 weeks before its MOT it decides to develop problems. The bike will run but only if throttle is applied and the engine doesnt like it its also spewing out white smoke and it smells rather strong of something but im not sure what it is and if i go more than half throttle it dies and it is impossible to pull away. any ideas would be highly appriciated as i really want it to pass as this is my first build