That depends on lots of factors. How it was broken in. How lean it
was run and what level of care did the previous owner gave it.

I have three TT46s. All of them run great. The one on my
Kaos has about 25 gallons through it and it runs as good
now as the day I bought it.

With new TT46s being as cheap as they are I really dont
think it would be cost effective to rebuild one.

Mike Hammer