That's interesting Vm, 25 ml of oil to 1 Lt is 40 to 1.

I've had a few old Victa motors and the motor has compression and runs but the conrod clangs as the motor runs and
either the big end is loose or the Gudgeon bush is loose and that is a sign of too little oil in the fuel mix.

Some of the older engines need more oil in the mix so the low quality bearings get adequately lubricated or they
can prematurely wear out.

I have heard of some people running old Villiers 2 strokes at 32 to 1

There is a discussion here with old 2 strokes and fuel mix ratios .
http://www.saving-old-seagulls.co.uk/phpbb3/viewtopic.php?f=2&t=3561

For me I wouldn't go thinner in oil than 25 to 1 with old motors and would put the needle down slightly in the carby and that is with
Valvoline Outboard 2 stroke oil ,the main use of this outboard oil is for water cooled motors but this one is
also recommended for other air cooled 2 stroke equipment.

It just depends on the owner what mix they run as I've seen some people use old sump oil as 2 stroke oil, on the
other hand I don't think it's worth buying super expensive racing 2 stroke oil as some people do for a lawn mower.

Cheers
Max.

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