yes you can !!!!!!!!!!!! in fact you can put in a 125cc....the pic in my profile is a honda z50r they came with a 49 cc engine....it was shot when I got the bike so i put in a lifan 110cc with a manual clutch....everything bolted correct....i had to buy engine as a package though....carb coil and cdi all came with engine...i got it a bit cheaper than normal.....I won it on ebay for 202.00 dollars....so the real answer is YES YOU CAN...