Yes you can use a credit card to buy a motorcycle if you have the money on the credit card to purchase the credit card.
You can also use your credit card to make payments to the motorcycle finance company if you do finance the motorcycle.
Most if not all businesses including motorcycle dealerships today accept credit and debit cards as payment for purchases of motorcycles and other things.
If you have the full amount of money on the credit card or debit card to pay for the motorcycle in full then you can use your credit card or debit card to pay for the motorcycle.
Then again like I mentioned before if you finance the motorcycle through the dealership or through another finance company for the motorcycle then those places will take credit cards or debit cards for the monthly motorcycle payments as well.
Just like you can pay a car payment with a credit or debit card too you can also pay payments for a motorcycle with your credit or debit card.