I had my Nephew bring me his kart since the mechanic working on it wanted to replace the engine because when you pulled the rope the engine would lock up and almost break your arm and I would usually break the rope, I performed a dry compression test and it was normal, So I just decided to readjust the valves and rework his starter recoil and installed the recoil facing more to the rear instead of straight up and it pulls like a dream no locking up and getting stuck but I was looking at the kart and I didn't see any identifications so I thought I would put out my first post. I attached photos


