1. Order (2) new 110-3181 graphoil gaskets from
http://onanparts.com/index.php?main_pag ... ucts_id=17
2. Sit down on a milkcrate.
3. Remove the side tins.
4. Remove the cyl heads.
5. Use plastic or wooden "scraper" to remove carbon after rotating the piston to the "top"
(a) Do not try to make it bare metal, just remove the "crustacations"
(b) Perhaps run Seafoam before and after the decarb. Prior will loosen the crud and after will get any thing left behind
(c) DO NOT introduce anything with GRIT
(d) Use your shop vac to remove particles as you clean.
6. Install new gaskets.
7. Torque head bolts per manual. (16-18 ft/lbs)
8. Replace tin. This is the only part requiring any finesse, it helps to pay attention during removal ( tab A, slot B etc)