Or do u guys think a 500$ down payment would be good enough . The bike is 7400
$7400 for your first bike? Seriously? I've had over a dozen, all paid cash, some new, and I've never spent that much.
Save your money, find a good used bike similar to what you want, and pay cash. The minute you buy a new bike the resale value will be thousands less, and when (if) you do pay it off you have overpaid thousands -
and it's worth even less. Do you have all the gear? Do you have money left for insurance and maintenance?
In your financial situation (from what you have told us) you are way over your head and about to make a mistake you will regret. If you need to establish credit, look into other options like a 90-day note. Get the note for an amount you have in cash and pay it off early. Get a Credit Card.
Sorry for not supporting your decision, but you need a reality check. At this point you need to compromise and not get everything you want.
Jay