Great advice above that shouldn't be ignored..
What condition are your cooler lines in? Clean and corrosion free? Where did you source the replacement O rings from?
As for the smoke.... Could be rings or valve stem seals, either way you need to dig into that top end to fix the issue. Don't cheap out on the build, if that top end is off then replace everything while your at it.
A week's work and a few hundred dollars on a Honda will see it last another 10 years or more, reliability and affordability at its finest ;-)
98 300 Fourtrax 4x4
Custom built mud bike - Now sold.
2004 Foreman 450S
Fully overhauled (nut & bolt rebuild), 2” lift kit, 28” mega mayhems, ITP delta rims, ES floorboards, 22” LED lightbar, Pyle Bluetooth sound system.