i have a cold start problem with this engine . the crank gat bent hitting a tree stump . so i have put in a new crank , i have timed it all up correctly . i also fitted new carb gasket set . genuine honda ones too . but now it is a real pig to start . the engine is fitted to a allen 453 professional which is a hover mower . it has a manual choke . i thought maybe valves are sticking . but no , maybe timed up wrong , but no , all is as it should be . but when it does get going it just doesn't sound quite right somewhere . when you push the govenor arm is doesn't seem to rev properly . i have tried everything i can think off . any ideas . :wink::wink::wink: