Replacing Tohatsu MFS 3.5A with 5hp carburetor

[Goozer]

Hello

I have an Tohatsu 3.5 which won't work well on idle so I've been thinking to replace the carb with 5hp version.

Does anyone know how damaging that is for the engine in the long run and where I should get the 5hp carb to get a decent one?


Thanks for the answers!

 

[pvanv]

It won't fit. Clean the old carb properly and you should be OK.

 

[Goozer]

It won't fit. Clean the old carb properly and you should be OK.

Hi thanks for the answer.

I have cleaned the carb with brake cleaner and ultrasonic bath and the carb reacts to the idle screw but when I turn it 1/8 a time it won't fix the problem (too high idle speed and dies in slower) and it will eventually just flood.


So is the only way to clean carb properly 4 hour acid bath or should I try ultrasound with some washing agent?

Also I find it confusing that the motor reacts to the idle screw, so can the idle circuit still be the problem?


Its this carb:

Tohatsu 3.5 HP Carburetor part 2

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[pvanv]

I do carbs in ultrasonic using 1-gallon cans of carb dip, and then blow out with carb spray. Usually ultrasound overnight.

 

[Goozer]

I do carbs in ultrasonic using 1-gallon cans of carb dip, and then blow out with carb spray. Usually ultrasound overnight.

Hi thanks for the answer! I try that