The Standard Silver 80cc engine is about 8.5" height 7" length 5" width. Engine fits on standard 25mm 29mm frame tube. Larger frame size requires drilling into bike frame and use of the universal T bracket.
2.75 HP (horse power)
25 to 40 mph depending on the gear ratio and weight.
MPG 100-150 miles per gallon
Independent drive sprocket and chain does not interfere with your current drive chain and peddling