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Around 150°

Why would it go from running great to needing carbs adjusted? disconnect idle/advance module and retest and check sync and link

You gotta run a t-stat or restrictor washer,,,cannot run with t-stats totally removed

May have a heavy float

That motor has a 16amp charging system and only the 1991 had a water cooled 40 amp rectifier

I'd say your jumping the gun and to try a different gauge one more time

Not likely with a floppy vane impeller

Either splines stripped in crank or shaft broke above impeller which be noisy as crap. Could have the stubby shaft unit if 25" or longer and coupler stripped connecting engine to lowrer

It has no base..2 gaskets and wear plate the bolt directly to lower unit housing..

Number 3...

That motor doesn't have a water pump base.... make sure filler block is in place in lower unit. and has the correct t-stats and matching covers. Also check you air pump as it has a temp sensor on it...

This is what I have been using for years on my customers and personal motors ...Mystik JT-4 sold at O'Reillys. Its is colored blue.

IMO...pull lower unit and sell and rest to scrap yard.

Might be cheaper to get a running motor...

Only alarm system is oil level in tank...so either the float is stuck down or magnet has come off.

Take the blk/yel wire off switchbox and check for spark...

Read battery voltage at idle and should 1-2 volts over standing battery voltage, test at 3000 rpm and should see 12.9-13.4 volts

Find a Tohatsu dealer and see if they can fix it

Make sure the IAC is not stuck shut ..just had one with similar symptoms in a Summerset HB

Build up is distributer cap..common problem for boats that stay in water as vent screen stops up