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Motor appears to be a 77 model.-----If you get this boat , it will likely need some work under the floor.-----Looks simpler than many fancy boats.

It seems the extra long models have a different set-up than long models.----If I had the parts in front of me it might be easy to figure out.---I have some long models to look at but no extra long in the shed.-----Sorry.

If a compression test is good it should be last for many years.----Install a new water pump impeller if you become the proud owner.

I have to agree , the 3 cylinder 49 cube motors built to 1988 were simple and rugged.

Model # of the motor ?-----You are sure it is not mounted on the water pump housing ?

Put a 90 HP 2 stroke on it.----Comes in at 300 lbs.

There is a hole covered by top part of the recoil.-----Maybe just needs a new gasket there.

Hook up a timing light.----One cylinder at a time.------you want steady flashing of the light.

Motor needs to be taken apart.

Looks like pre-ignition damage on #1 piston.-----Or overheating.----Many of these in line six motor need a new impeller every 3 years or so.----Many do not have an overheat warning horn either.

You installed the correct factory impeller?----Measured to fit the different diameter shaft on these motors ?----Removed exhaust cover ?-----Perhaps there is a hole in it.

Is the water in your test bucket 6" above the impeller ?

So you did not inspect the washer at the top of the tube ?

They made a 5" coupler for the water tube.----At $50 it sounds like a farmer used a cheaper option.----Might just remove what is there and measure to see if it will reach into the water pump grommet.----You ordered a new short shaft or used ?

That is where water is supposed to leak out into the exhaust.-----I suspect and have seen it more than once that plastic washer at the top of the water tube is melted.----Remove powerhead to inspect this.----The replacement factory washer is now a better quality.-----I keep some on hand myself.

Post the actual compression values on this motor.----Was water pump maintained ?-----Mixed gas and oil at 50:1 in the tank ?-----If you can repair it yourself it is worthwhile.----If you have to pay $2.00 / minute at a shop it will be expensive.-----You might even have trouble finding a shop to...

The model # suggests your motor is or was a short shaft.----Is there a 5" spacer between lower unit and exhaust housing ?------You will need a short driveshaft.----Short shift rod would be 5" shorter than the long shift rod.

It is a simple procedure.-----Perhaps you can find a video on U-tube.-----Explaining this to you.

I usually find 3 of the 5 bleed inserts missing !----But I can not inspect your motor !

Model # of this motor ?---I assume a 2 stroke.-------Have you checked the gear oil ?------I know for a fact that these gearcases ( 2 stroke ) are not robust.------See if there are any metal bits on the drain plug magnet !!