IVE BEEN TESTING 4 DIFFERENT ENGINES WITH OIL RATIOS FROM 24-1 TO 50-1 AND ALL THE ENGINES ALL GET A HIGHER RPM WHEN THEY ARE FIRST STARTED COLD. I LOOSE 250-300RPM ON ALL 4. I BEEN THINKING THAT MAYBE THE ROUND PISTON IS THE TROUBLE. I KNOW ON SB CHEVY WE USE ELIPICAL PISTONS FOR THIS REASON. IVE USE DIFFERENT MUFFLERS FROM STOCK TO NO MUFFLER AND GET THE SAME RESULTS. ENGINES ARE TORO 2BB, TORO 1BBL, ECHO 23.6 AND A FACTORY G23. ANT THOUGHTS GUYS
FARMER TED