LESS POWER??? AYFKM.... First of all you need to know how to properly jet a carb. Then you might want to do some more research on vintage two-stroke engines. Now Bel-Ray has been making MC-1 Synthetic two-stroke forever, I started using it in the mid 70's and they still make it today.
Next....
Heres a copy and paste for your MC-1 oil:
Bel-Ray MC-1 2-Cycle Synthetic Racing Lubricant is a smokeless premium high Viscosity Index, high molecular weight fully synthetic ester lubricant specifically formulated for high dilution ratios. For premix in high performance air-cooled or liquid-cooled 2-stroke engines in motorcycles and ATVs under racing conditions, Bel-Ray MC-1 has unsurpassed film strength and load carrying ability for superior anti-wear.
Applications
* For premix only. Recommended ratio of 50:1 (2% oil), but can be used in ratios between 50:1 and 80:1 depending on engine type and usage. Equally suitable for air-cooled or liquid-cooled high performance engines
Notice the recomended ratios, your what at 20-25:1? I guess you know more about their product that they do. This in it self should say enough.
Oh, and as far as jetting goes, did you notice how I mentioned plug readings? I guess you use plug readings for something else or maybe you read the piston crown, with that much oil I can just imagine what that looks like.
Now dont get all hurt and start quoting Jennings on me.:laugh: