Believe it or not it happens. When I was a service advisor at a HD dealer I was told that especially with Sportster we did not service anything older than 10 years old except for tires and oil change. Reason being was that they were to difficult to repair and sometimes all chopped up from those who could not repair them before.so it came to an authorized HD dealership,not running,they threw up their hands and said it's impossible,we can't fix it?
new fuel pump,injectors,map an crank sensors ,wire harness been to dealer 9 hours ,another shop an now to a third shop no one can figure out problem help
starts but bogs down had codes po107-po132-po174 was told it was a flood bike engine lite on at one point after new wire harness it ran great till i put gas in it stalling in beginning it was sputtering some back fire out of ext an threw air cleaner also ,a few times plugs were white they r thinking poss ups sensor an some kind of part that works with crank sensor that is inside engine an if that is bad 2 or 3 grand to fix also told new manifold an carb but that may still not fix when at dealer they put new ecm on but was not problem so old one was goodnew fuel pump,injectors,map an crank sensors ,wire harness been to dealer 9 hours ,another shop an now to a third shop no one can figure out problem help