Just bought a 79 Sportster that doesn’t run from a friend. It’s my first bike and so far I’m just trying to figure out what I have. The VIN on the engine checks out to a 79 XLS. However, the Carb has a part number 27490-96 and after some research found that it is a 40mm CV carb for a 1200 cc ‘96 to ‘00 model. Is this carb compatible with my engine? The main jet is a 170. So far I tried to start the bike when I first got it. I was able to get it to run as long as I was keeping it throttled.