Mc Culloch Ride On Lawn Mower

mc culloch pro mac 1850 sbh 18hp twin briggs and stratton engine i purchased this a year ago and used it for all of last season but realised it had a problem with engine it still runs but only runs on 1 cylinder dont think it would take alot to put right everything else works perfectly its very neat and tidy and i have put brand new deck belts on it new filters fitted its a hydrostatic backwards and forwards 6 different hieght cuts 48 inch cut will be a very good mower when sorted