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A 2 hp motor or 300 HP motor.

You can buy quality steel and there is lots of junk steel on the market as well.-----All made to customer specification with PRICE / COST in mind.

If carburetors are full the motor should start.--------The fuel pump is driven by a PRESSURE pulse from crankcase.---Is there a good pulse ?

Know of a dealer that only sold small 4 strokes with electric start.-----Said that they were too busy to deal with the typical -----" My motor won't start phone calls "

Some will argue-----Usually the impeller is all you need.

Gaskets can be made.

Sorry---too far away to help out.

your location ?

Small 4 strokes sometimes need electric start.----Reason is that flywheel needs to turn once to get spark to 1 cylinder.----A 9.9 fires both cylinder for every turn of the crankshaft.

How did the motor run for you last season ?----The rev limiter does not kick in at 2000 RPM...----Do the trouble shooting.----Check spark.-----Post actual compression values.----May be running on 3/4 of 6 cylinders.

Also depends on how far you travel with it.----Trouble 1 mile from home is easier / cheaper to deal with than trouble 200 miles from home.

Helped a neighbor build a trailer about 30 years ago.----Did all the welding on it.----Saw it with the same 24' boat on it about 4 years ago.-----Still as strong as when it was made.

Some do not have drain holes in them.-----And some are made with cheapest steel tubing.----Get a new trailer as that is junk !

Maybe run both engines on a marine dyno.----Need to establish power output and see if both engines are in good condition.

I consider the VRO as being an overpriced simple device.----Putting new rings on used pistons is a mistake in my opinion.

The engine is the common OMC crossflow.---With certain features as it comes under Coast Guard rules for ---" inboard mounted " -- engines " -All suffer from broken piston rings over time.----Top ring groove is usually damaged.----Rebuilt many of those engines.----The rod bolts use a 5/16"-12...

Design / size of the boat comes into the picture.-----In rough weather some boats can survive hrs waiting for rescue.------Others may need the high school wrastling champion and a large bucket.

Learn how the electric primer valve works.----Test the electric primer valve.-----Or test with electric primer valve in manual mode , squeeze bulb 2 times.----Put valve in run mode and try and start the motor.-----Have battery fully charged and load tested as well.

No such thing as a 4 stroke in 78.-----No such thing as EFI in 78.-----You can clearly see the 3 carburetors at the front of the motor.-----Do a complete evaluation before spending hard earned money on this motor.

How did this motor run for you last season ?----Is the electric primer valve working ?----Are you pushing the key in and holding it in while cranking for cold starting ?