SOME OF THESE SPECS ARE NOT THE SAME AS IN THE MANUAL - BUT THIS DATA WAS SENT TO ME DIRECTLY FROM THE OWNER OF 2FAST IN DEC OF 2021
RING GAP
47.60mm Bore .18mm (+- .03mm)
50.00mm Bore .20mm (+- .03mm)
52.00mm Bore .28mm (+- .03mm)
IGNITION TIMING STAGE6/POLINI
70cc 3.55 to 3.65mm
86cc 3.80 to 4.10mm
90cc 3.90 to 4.30mm
94cc 3.80 to 4.10mm
100cc 4.30 to 4.70mm
IGNITION TIMING - MALOSSI MHR II
70cc 1.55mm MAP 2/3/4/5
86cc 1.6mm MAP 2/3/4/5
90cc 1.6mm MAP 2/3/4/5
94cc 1.6mm MAP 2/3/4/5
100cc 1.65 to 1.75mm MAP 2/3/4/5
IGNITION TIMING - MALOSSI MHR I
70cc 2.15 to 2.25mm
86cc 2.20 to 2.40mm
90cc 2.30 to 2.50mm
94cc 2.20 to 2.40mm
100cc 2.30 to 2.50mm
SQUISH
70cc 0.45/0.55mm or
86cc 0.60mm or 23.62"
90cc 0.65mm or 25.59"
94cc 0.70mm or
100cc 0.70/0.80mm or
50cc cases for a 50cc cylinder with crank 2fast 39.3-85 d.75 bore size 76.5
50cc cases for a 70cc cylinder with crank 2fast 39.3-85 d.75 bore size 76.5
50cc cases for a 90cc cylinder with crank 2fast 45.8-90 d.77,8 bore size 79/79.5
50cc cases for a 86-94cc cylinder with crank 2fast 44-90 d.76 bore size 77.5/78
50cc cases for a 100cc cylinder with crank 2fast 47-95 d.79 bore size 80.5/81