■ The MA- 4-5 carb has a slightly different fuel strainer system. You do not have to
disconnect the fuel line. Rather, on the side opposite the fuel inlet line there is a hex-head cap plug. This plug actually has the strainer attached to it and is called the Fuel
Inlet Strainer Assembly, p/n 95-506. The plug is locked in place with a soft metal gasket,
p/n 16-A48, that has bendable tabs and a horseshoe side that fits over a ridge on the
carb. The bendable tabs are bent down over the strainer assembly nut to lock it in
place. To lift them, use a sharp edge tool to get them clear of the nut face and then tap
them out of the way with a drift pin or screwdriver and hammer. Using the appropriate
wrench or socket, remove the strainer assembly. This one is a bit different than on the
MA- 3. Because the fuel comes in the other side, the far end of the finger strainer is a
sleeve that fits into the inlet port. Again, flush the strainer from the outside in and
collect the debris for examination. Also, the strainer can be straightened by rolling.
Reassemble by reversing the process.
■ At the bottom of the carb is a sump drain that is a pipe thread
plug. This should also be removed and the sump flushed with
fuel. Again, I like to catch this fuel to check for debris.
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■ You must be very careful to insert the sleeve portion exactly in the inlet port. If
you feel any resistance, pull it out and check to ensure you have not bent the screen.
Damaged screen assemblies are expensive to replace, about $70, so treat them with
care. Also, it is recommended that you use a new gasket. Since the 16-A48 is a bit more
complicated, expect to pay from $5 to $10 for one. Again, torque the nut to 10 to 12 foot-pounds. The nut is locked in place by bending over tabs against the face of the nut.
Usually starting the bending of the tab can be done with a screwdriver, and then the tab
can be tapped in place with a drift. Remember to flush the sump and do a leak check,
and you have completed inspecting the fuel-filtering system on your carb.