What size jets should I put in my carburator for winter? Do?  I go bigger or smaller for the sizes?

What mod you have and what is your jetting now

Its an all stock 89 racer. No mods,pipes,or mufflers. Stock carb. Stock jets I'm assuming.

20:1 and might switch to 32:1 this summer

Yea that's way too much.

If you want to ride it in the cold I would switch now. Klotz is good thats what I run in my snowmobiles. Pull the plug on the bottom of the carb and back the main jet out and tell us the number. Stock for 89 is 240. As old as it is i'm sure it's been messed with, better off to check it.

I have been building two stroke motors since the late 1960s.  I have not seen any new technology in castor oil in the last 40 years and I have still not found any two-stroke lubricant that does a better job than castor oil.  Castor oil has some unique properties that petroleum and synthetics do not possess. 

Dick Lechene founder of Maxima Lubricants told me many years ago that all of the US oil companies get their castor from the same two or three barges that comes to the US each year.  How the different oil companies press it (filter it) and the additives each company uses that improve its "mix-ability" with gasoline is basic difference from one two-stroke castor oil to the next 

The fuel/oil ratio DEPENDS upon how the engine is operated.  A two-stroke engine that only runs at an idle will receive adequate lubrication at 80:1 to 100:1.  Large two-stroke engines (100cc to 500cc) running ONLY at wide-open throttle needs fuel/oil ratios in the 10:1 to 20:1 range.  Some model air planes engines run fuel/oil ratios of less than 10:1. 

It becomes obvious that one has to choose whether we want to mix enough oil in our fuel for the most severe mode of engine operation or go with less oil and limit the amount of time that we can spend at each brief blast of wide open throttle.  An engine needs ratios below 20:1 when the throttle is wide open and the RPM are high for more than about 3 to 5 seconds.

Keep in mind most castor oils aren't compatible with race fuels under a certain specific gravity. I know this inclues Sunoco Purple and maybe even c12.

Different brands of castor have different detergents (additives) to improve mixing.  It is up to the individual to test their fuel and oil for solubility at the temperature that they will be using the fuel. 

If you are experiencing mixing problems, a pint to a 1/2 gallon of pump gas in 5 gallons of fuel has always fixed the mixing problems Maxima 927 has had in any race or Av. gas I have used.  Adding 1/2 gallon of pump premium in 4.5 gallons of race gas will reduce the octane less than two octane points.