One other thing with those is the o ring for the inlet manifold.
Grab the carb and give it a wobble. If it moves a fair bit, especially if you can get the manifold to move, it might need the manifold o rings changed.
There a fat o ring around the manifold to seal to the carb. Then if you undo the two screws theres a little skinny one under the manfold. This usually deform a fair bit when fitted and if the manifold works loose it can leak. You can buy both o rings from a bearing shop they are common sizes.
On those motors some had points.
Best thing is to stick your fingers in under the metal cowling just above the hose that goes into the carb and feel for the electronic ignition module. Its about 3/4 the size of a matchbox riveted to the underside of the top part of the crancase that comes out to screw the cowling onto.
IMHO that there is the best utility they ever made. Even without the electronic igniton.
Only bad point about it is that the motor is pretty high which means you cant mow in under bumper bars and that sort of stuff like you can with a powertorque.
