First highway ride

[kingxs400]

It depends which model you have. If it's a 5 spd Maxim dohc with 16T/35T, the only real option is a 17T on the front since the rear is already 35. Don't think there is a 34T for the Maxim rear.

If it's a sohc, it could have a 16T front and as many as 37 on the rear - so I think you could increase the front and decrease the rear. But doing both might be overkill given that the sohc has less power. There are a number of good threads on here about sprockets with input regarding both versions.

it is 1980 yamaha xs400 special it have 6 gear on it rear tire is 120/90/16

 

[MNovotna]

Took my new 1983 Maxim on a 5,000k ride to the Maritimes. Ran great on gravel, side roads, free ways at 70mph. I didn't brave going much faster but I was only at 6000rpm... felt great.
Floated a bit in strong wind, though, near the coast, but never seemed to get too unsteady. I'm 150lbs.
I'd do it again.