K321 govenor problems

[john]

HELP just got my first AC a 312H that had a grenaded 12hp in it . Picked up a great deal on a K321 for the extra power. I can't get to run at full throttle the govenor keeps pulling it down. I've syncronized the govenor the way a manual I found at the local libary. The only thing is it must need a ring job, getting a lot of blow by through breather, and seems to be really down on power. Does anyone know if the carbs between the 14 and 12 hp engines are the same. I thought that might have something to do with it. Also does anyone have a diagram of the brake system on the 312. I found one at the libary bu it's wrong. It shows two rods to rum the brake band(ones for park brake) mine looks to only have 1 rod, cant tell its all missing thanks for the help