you have to figure jet area. the cruise area for the 1812 is .00637. the cruise area for the 1912 is .00518. I worked on an 1813 a few years back and ended up with .107 primary jets and 70x47 rods with .104 secondary jets. cruise area was .00515 and WOT was good. so, the newer jetting for the same size carb confirms the tune up I did. one thing I did to help tip in was get rid of the big squirter. I used a .024 and this set-up drives great with very responsive WOT. I always believed to 750's and 800's were way too fat and the over rich condition contributed to the hesitations.