I have a 97 Vmax 500 that runs very well until today. My son was on it and he said it just stopped. When he looked under the hood the exhaust gasket was broke. I put the gasket from my 98 Vmax 600 and tried to start. It will not stay running. What am I missing. Could a failed exhaust gasket foul plugs instantly? Did it take out something else?

With the choke on full, we can get it to run although roughly.

Help.