I've received conflicting advice on what type of oil to use in my 1947 Scott cycle, water cooled two stroke, recently re-ringed. The Morris folks recommend mineral oil or Castor Oil, but not synthetic. The Klotz folk recommend their KL-302 techniplate synthetic. The bike will not be raced or run hard, and will be stored most of the year. Should I run mineral oil to break in the new rings, and then go to synthetic? I'd like to avoid the coke and gum formation of the Castor if possible.

I would research this a bit more if I were you.
Try to find some bike forums specializing in two strokers.

It gets complicated when considering what oil to use at what ratio. Modern day two stroke oils do not need a 16/1 one mix but when you alter the fuel/oil ratio you also alter the fuel/air ratio which means jetting changes.

It is best to get expert advice on this one.

This message has been edited. Last edited by: rokky,

There are many quality 2-cycle oils out there but there is only one that I use in my older 2-stroke engines (1946-1966), and it is:

8104 MONOLEC Two-Cycle Engine Oil SAE 40 Pre-Mix made by Lubrication Engineers. Anything from 1946 to 1960 I mix at 16:1 and the rest at 32:1

I have had great success with this product over the past 5-years without any deposits and heavy smoke.

Good luck with your 1947 Scott.

Wow...16:1 ratio. I realize that older oils might not have been all that, but that seems awfully rich with the quality of today's lubes. Was there another reason for running such a rich mixture back then?

Oil was part of it, but the main reason for the 16:1 ratios had to do with the bearings used. Most 2-stokes started to use roller/needle bearings sometime in the 60's and the ratios started to go to 32:1. With more technology and EPA things are where there at now.