You could probably get a pretty good idea if you took out a spark plug and carefully used a pencil or a chopstick as a probe to be exactly sure when the piston is at top dead center, then fill the cylinder to overflowing with oil, then lower the piston to bottom dead center, and used a big syringe, like a kitchen turkey injector, something to measure CC and fill to overflowing with oil again. It wouldn't need to be very precise, there ought to be a pretty notable difference between a swept cylinder volume of 27 cubic inches on the 883 and 36+ cubic inches on the 1200.
Carefully suck the oil back out with a mityvac or something. Wash the cylinder lightly with a squirt of gasoline, suck out again. Hitting the starter while there was a quantity of oil was in the cylinder would be a disaster, it might squirt out of the spark plug hole fast enough not to break something, but I wouldn't bet on it.
I took the bike to the shop today and they told me the carb was 3 sizes to big. They said it should have a 38 mm and it has a 40. So i had 2 choices buy a carb or do a conversion. So i dropped a grand on them and they said i would have my bike in about 10 days.Thanks for all the help , ya,ll are great. I,ll let you know how she feels when i get er back.
Kainam, the carb was on the bike when i bought it, i'm the third owner. The guy i bought it from bought it for his wife but she did,nt like it said it was to big for her. when i bought it he said he thought it was converted to 1200 but was,nt sure. Nathang, thanks for the flowers, yes it is loud. I took the baffles out to see if that would lean it out any, it did,nt the baffles are going back in.