2-stroke engine, hard to start up, I changed the spark plug. And still... This is what happens when I try to start it: So I get some speed then release the clutch to engage the engine. However, right after I release the clutch the bike slows down as if I pulled the brakes. So the engine does not start up. (P.S. IT WAS NOT LIKE THIS WHEN I FIRST BOUGHT IT) and thanks for any help!