TOHATSU 40 Service Manual page 53

Mix Ratios
In addition to oil in the oil tank, a 50:1 gasoline/oil
mixture is required during engine break-in. Refer
to Break-In Procedure in Section 2.
Automixing
The gasoline/oil mixing ratio varies automatically between 50:1 (2%
oil) and 120:1 (0.8% oil) according to throttle opening and engine
speed.
Premixing
Engines not equipped with automixing system, or engines to be
operated with automixing system disabled require a 50:1 gasoline/
oil mixture (2% oil). New engines, reconditioned powerheads, and
engines coming out of storage require a 25:1 gasoline/oil mixture
(4% oil) during the first 10 hours of operation.
3-/ 4-Cylinder
CAUTION
FUEL SYSTEM
3-5