Vanguard timing key

Simptoms of sheared or partially sheared key? 16hp
Has good compression,spark on both cylinders but weak power, new carb.
Just push me to pull like I should, but with symptoms.

Thanks.

OK Jim I will Bite ?
I have ran Offset keys in the Cart engines before for more power on the top end But are you saying you have this issue or found it out ?
I found this out when I put one in Backwards by mistake ! Did A lot of digging before I looked at what I did wrong !!LOL!!

exhaust restriction?

Well Jim, are you going to tell us what was wrong with this engine?

Not yet, didn't look.