Tohatsu 15hp 4 stroke upgrade to 20 hp

[bmb779]

Anyone done this conversion? According to parts list the only difference between these engines is the carb jetting,everything else is the same between 15 and 20hp.

[bmb779]

Confirmation from Will Evans at Tohatsu UK, the Mfs 20hp C four stroke engine is used for 15hp and 9.8hp as well as 20hp. To convert a 15hp to a 20hp you only have to change jets in carb,4 parts Main Jet,Slow Jet, Main jet plug and Main nozzle dead easy to change and 30% more power.

[micro87]

Hi bmb779,


Sorry to drag up an one year old thread but did you manage to upgrade successfully? Was it as easy as switching just those parts you mention? No settings that needed changing?


//Elias