Need help identifying motor , 5hp 2 stroke mercury

[Mc Tool]

As above . Two neighbourhood lads arrived at home last night with this


Carb gunked up crank bearings noisy as all hell ,looks like it fell of the back of a truck several times , gear lever broken . It does have good spark (⅜" plus ) and 120psi compression .
There is no identifying numbers to be found and Im hoping at least one of you clever blokes can give me a year or model number so I can suss some parts prices for these guys .....and try to get them to find another motor .
Thanks

 

[racerone]

Not worth fixing.----A motor marketed as a Mercury.----Marketed as many others as well.

 

[Nordin]

That is a 1985-86 year model and as racerone marketed as Mercury and also marketed as Tohatsu.
Here in Europe it also was rated as 4Hp, I have maintain a couple of these and it is a good motor but with a noisy crank it will be expensive to fix.