18 horse briggs v-twin full throttle surge

its my friends mower, but when im drivin it around it has a small surge, its not enough to drtasticly cut speed but its noticeable, and the muffler box broke off of it so it pops when it re-accelerates, could the broken exaust cause this? im not sure what to do

Exhaust may be part of the problem, not enough back pressure. Can burn a valve also. Usually a surge means it is running lean, not getting enough gas.

im goin richen it this weekend to try to fix the surge but i like the broken exaust cause it makes it sound like a harley

Replacing the muffler may help the lean condition.

Removing/changing a muffler increases airflow which affects mixture, as do modifications to the intake and carb.

ill do anything to get it to run right exept replacing the muffler, it just sounds so cool like it is

crafsmankiller wrote:

ill do anything to get it to run right exept replacing the muffler, it just sounds so cool like it is

Be prepared to do the exhaust valve fairly soon.

ok, its not mine and the owner said he doesnt care about it, so ill run it till it dies