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??----The VRO is operated by PRESSURE pulses.-----The VRO uses an air motor.----Failure of the fuel diaphragm does not always result in fuel going into the crankcase.-----Trouble shoot the fuel system.----Find the leaks.-----

I would use some carbon fiber and West System epoxy to repair that.

Part # for 9.9 / 15 HP only shows it fitting the 9.9 / 15 HP from 93 to end of production.

#2 is the VRO fuel pump.----It mixes the oil with gasoline.

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.

Is red lever on electric primer valve in the correct position ?

Need to do a proper spark test.----Does spark jump a gap of 3/8" ( 1 cm ) or more on a test device.---Sparkplugs are not used for a proper spark test.

??----You should drain the oil tank ASAP.-----If the system is injecting water it could be an EXPENSIVE event.

1991 to end of production on the 6 and 8 HP.----I would likely repair that myself.-----Your location?

Sparkplugs should all look the same.----Too much fuel on #1 and #.----No spark on 1 and 3.----Crankcase compression issues on 1 and 3.

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I think the clipper circuit is outdated and can be eliminated.----Note----I think I have one of those 1972 blocks on the shelf with 4 new pistons.----Left over from my more ambitious years.

Yes , there was a " clipper circuit " installed.-----Prevented high voltage from damaging the amplifier I believe.

We can not see / touch these motors.----Posters need to do the inspection and report what they find.----There is no magic to this.

See post #9 and #11

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.