Im 5ft 10 about 245 now the question is will the 600cc bike be to small and slow for me and l should go for the 1000cc bike or shouldl get the 600cc bike. l been riding for 2yr and sold my old bike a yr ago. im not looking to race just to hang out with friends maybe put a girl on the back. if anyone knows about bikes help me out.

wrong section ...you need Cars & transportation > Motorcycles. This is Racing. where we would have got into corner speeds and acceleration verses braking. could have been a good question in the right section.

as an after note .if you think your weight is enough to slow a 600 down.
get a car.

get the 1000 l bought a 750 when l was 19 within 2 mos. l wanted something bigger

throw a leg over a current Yamaha R6, they sit pretty high for a 600 compared to say Suzuki GSXR600, and take it for a test ride! you dont have to decide on the internet. l reckon the R6 would be a good start, then say ZX636 or whatever it is Kawasaki is running.

Then try an R1, if you're not a retard and can control your wrist you will be fine on either, might go for the 1L if doubling the gf is going to become frequent.

1000 duh bigger means faster