hi Bax,

i now have 4 OS fourstroke engines. while they are running fine and new, i would like to ask about their long term maintenance as well
as what are the likely expendible items, like gaskets, or bearings, that needs to be changed, and roughly at what periods?

i hope to make my investments in OS worthwhile. i recently have problems with a saito engine 72 fourstroke, bought 3 years ago.

please direct me to this advice if it has earlier been mentioned.

thanks.

There is no list of "expendable" parts, nor life expectancies. No parts should wear out in any particular time. Well-kept engines can easily see 100 hours or more of use. Corrosion, bad fuel, and lean running are the most common causes of shortened engine life. If you run your engines conservatively, make sure they don't get any corrosion, and they are kept clean, you'll find that they give years of reliable service.

hi Bax,

Thanks for the tips.

100 hours is like just 4 years, assuming 4hours flight per month. i hope it can last say 6-10 years.

reason i am asking is because i find my other brand engines deteriorating just after 3 years.

Bax
What About OS 2 Stroke Engines? I have 13 of them and Run Coll Power 15% that I add 4 oz of Klotz Caster Oil to a Gallon of fuel. I'm learning 3D now and have mostly 3D Capable Birds. Engines from 46FX to 120AX and all but new 75AX. I try keep My Engines on Slightly Rich Side or 200 RPM to 300 RPM less Peak RPM when setting Main Needle Valve. Any advice for Retired Disabled Veteran? richgrow

The comment I made about the 4-stroke engines can be applied to the 2-stroke engines.

With all engines, though, most never last beyond 30-50 hours because they're badly-maintained, crashed, just run poorly, and so forth. The vast majority of engine problems, regardless of engine brand, are user-caused, and not due to the engine's design or manufacture. Take care of the engine, keep it clean and corrosion-free, don't run it overlean and it should last a very long time.