Yes they do. If you remove the fuel line at the gas tank fitting it will be inside the fitting or the hose. It's red and kind of looks like a small straw with screened openings on the sides. If you remove the gas cap and look inside with a light you will see part of it where the hose fitting is...
I run shell premium v-power with stabil in my GCV 160 and GCV 200. I’ve never really had any no start problems. I just perform general maintenance at the beginning of the season.
I would use 0W20 if that’s what is recommended. If you are worried about fuel dilution or severe driving conditions then change it sooner. But I would do that with any oil.
On all my OPE I use the oil that comes with the unit for about 2 tanks of fuel and then change it with Amsoil 10W30 small engine oil. I change it again every 25 hours.
Honda HRX217 mower with GCV200 engine
Changing air filter, fuel filter, spark plug, and engine oil.
I had to remove and reseal the valve cover because of leakage. I adjusted the valves also.
Refueling with Shell V-power premium fuel
When I replaced my water heater I used all copper sweat connections with dielectric unions. I also replaced the cheap plastic drain valve with a brass ball valve with a garden hose fitting on the end. It’s very convenient if you need to drain it to replace the anode rod or gas valve or if you...