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Two strokes behave a little different !-----When idle mixture is adjusted on a hose you can get a really sweet / smooth idle.-----Often it then is too lean to accelerate in gear at the lake.---Fact---There are no accelerator pumps in the carburetors.-----Therefor the low speed mixture must be...

These older motor can be an economical way to go boating.-----But they require that you learn / want to learn how to repair them.----Most shops do not work on them.------So these motors are worthless to most folks today.----And folks who know how to repair them often get them for free.

At the house on muffs ( in gear ) is still neutral.----Prop does no WORK in air.

Sounds like the shift shaft splines jammed due to rust forming in the coupling.----The splines normally slide out and there is NOTHING to disconnect.-----These 4 cylinder 650's are a nice runner.----The first thing I would do is a compression test.----Post the actual values.---Or remove bypass...

Yes , that is an outboard with a special bracket.------There are 2 different blocks in V-4 models.----Need model #.

Throttle plates should be CLOSED at idle.-----Correct that FIRST and test run.------Replace that damaged roller.

Trim was an " expensive " option in those days.-----Today you rarely see a big motor without trim.-----And you see 9.9 HP models with trim / tilt options.

Float valve is stuck.----Clean the carburetors.

Was given a 2004 Ya@%A 90 HP 4 stroke.----Not worth fixing.----Picked up a 150 HP Ya%$#@a 4 stroke for $1000 Ca funds.----Well to do folks said---" get us a new one " no need to waste a short season at the summer home.

So many people are poorly informed.----Indeed a power trim / tilt 0172858 was an option for the 55 in 1979.----Post pictures of the ones found on E-bay.-----And they are easy to install.

It is the same block as the early 25 / 35 HP.---Same electricals.--The intake ports are tiny.---I have a NOS block on the shelf here.-----That restricts the breathing thus limits output.----I sail too , but too far away to help.----There must be a fellow sailor there who can help you.----Post a...

The 4 strokes really run so nice.----But that comes at a cost.-----I can't believe the number of used 4 strokes for sale these days.-----Perhaps the folks who can afford them buy a new one.----Repair / service work is big $$$$ on them.

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Yes ,there are " spray on " gasket softeners.

Razor blade type scraper.-----Exacto knife.----Carbide scraper.-----Homemade gasket scraper ( power hack saw blade ) is what I use.----Can't imagine it would take more than 10 minutes for me.

Compression test is first thing to report.-----Engine may require major work.

There are 2 models.-----The deluxe model is more $$

S.L.O.W. mode perhaps.

Many trips to EMERGENCY / hospital entrance started out as ----FUN.

Yes----Most everything is the same.----What parts are you looking to get?-----Spend no $$$$ ( beer tokens ) till you do a compression test.-----Post the actual values here.