No----I do not see rapid failure.-----I would say you need to look for other issues in your fuel system.-----To long a fuel line.----Too many filters.-----Plugged pick up tube in tank .----Low crankcase compression etc.
About 1977 to 1988.-----Newer than 1988 will NOT fit.-----40 / 48 /50 / 60 HP in 2 cylinder models.----And 3 cylinder models do not fit.-----Your location?
The 2 cylinder motor has a gearcase that is less than " robust " and the 3 cylinder should be your choice.----But do a compression test before spending the beer tokens.
The pulse limiter is nothing but a ---" flow fuse " ----To protect the VRO from a high pressure/ airflow event.---It closes in the event of high airflow to the VRO.------The housings on the VRO would explode if subjected to too much pressure.
You are aware that this motor only runs on the top 2 cylinders at idle??----Bottom 2 carburetors start adding fuel to #3 and #4 once engine is at 1800 RPM.
Correct ---they have rubber hubs !!----They left the factory with a steel drive pin.----A wise owner could use a shear pin on a 6 HP as it is cheaper than prop repair / new props.
I think the clipper circuit is outdated and can be eliminated.----Note----I think I have one of those 1972 blocks on the shelf with 4 new pistons.----Left over from my more ambitious years.
Bring it home and do the compression test yourself.-----If it is indeed 45 PSI it will need some serious work.----I believe you can remove bypass covers to look at pistons and rings.
