Found a really nice 03' Deuce with the 95in, 1550cc engine.

Has full exhaust, stage 1 intake and a stage 1 race tune.

Just wanted to know how reliable are these bike? I plan on doing long ride, about 3-4 hours freeway/ town every weekend.

What's the most common issue with these motor?

Thanks

 

I want to correct that this is the 100th Anniversary that came with the 95 engine.

 

How many miles on it?
It'll be as reliable as the care the current and previous owner(s) gave it. If it was abused and neglected, it probably won't be very reliable.
Depending on how many miles are on it, the cam chain tensioners may need to be looked at.

 

Has 6k miles. An original owner bike. Looks brand new and sounds great.

Would the cam Chain tensioners be an issue in the future? How much is it to replace it?