Quote:
Originally Posted by Jayman77
put in the 80 cc kit
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Pilot and main jet sizes?
If using the stock head which has around a 5cc combustion chamber . . .
39mm bore (50cc) = around 10:1 static compression ratio
44mm bore (63cc) = around 12.6 static compression ratio . .
resource
47mm bore (72cc) = around 14.4:1 static compression ratio . .
resource
50mm bore (81cc) = around 16.2:1 static compression ratio
52mm bore (88cc) = around 17.6:1 static compression ratio
For comparison . . .
Sym 50 11.8:1
Honda Ruckus 50 11.9:1
Yamaha Vino 50 12:1
Static Vs. Dynamic Compression Ratio
1 teaspoon (4.9 cc's) in a stock 139QMB cylinder head . . .
