I have a 4HP Mer. that will not run. 1972 model 40 ser # 3303202. I have tried everything that I can think of with zero success.
It will not start with normal fuel.
It will not start using starting fluid directly in to the carb throat.
It will not start spraying fuel into the spark plug opening.
Here is what I have done so far:
Cleaned the carb
Replaced the spark plug
Replaced top and bottom crankcase seals
Compression test 105 psi
Good spark under pressure and open air
Vacuum outside reed plate with vacuum/pressure gauge about +/- 10psi
Vacuum measured where fuel pump port is attached to crankcase +/- 10 psi
Blown air thru intake port ( all clear)
Exhaust port is clear
Measured where spark occurs by rotating flywheel by hand and observing when spark plug fires. Near TDC
I am looking for any suggestions about what to do next..Getting close to going to junk yard
John 952 890 3885 firstname.lastname@example.org