KartFab
Active member
Take the breather tube cover off. There is a small drain hole in the bottom of it. It may be blocked.
I had that same problem with that same engine on that same kart. It was reading 90 psi on compression test, thought it was the crankcase over pressurizing because of possible bad rings/blowby... But it wasn't. Tecumseh 10-11 hp engine right? (My solution was to buy a gx390, the kart just didn't have power at all it felt like it was a 2 hp engine).
Also, your driven unit needs to be flipped around. It's on backwards for the red spring. If it had a yellow spring you could run it that way.
I had that same problem with that same engine on that same kart. It was reading 90 psi on compression test, thought it was the crankcase over pressurizing because of possible bad rings/blowby... But it wasn't. Tecumseh 10-11 hp engine right? (My solution was to buy a gx390, the kart just didn't have power at all it felt like it was a 2 hp engine).
Also, your driven unit needs to be flipped around. It's on backwards for the red spring. If it had a yellow spring you could run it that way.
I didnt have any yellow.