You have fallen prey to those people who will find any excuse to avoid trying something new.

A 4-stroke is no harder to tune than a 2-stroke. Many people will also say that 4-strokes need regular valve adjustments - That's a load of bull. I own mostly 4-strokes and have done so for about 20 years. To date, I have adjusted valves twice and one of those times it really didn't even need it.

What IS true about 4-strokes is:

1) You should run at least 10% fuel - 15% is better.

2) You must use a 4-stroke glow plug.

3) They cost more than a comparable 2-stroke

Now, that having been said, a 91 4-stroke will burn much less fuel than a 60 2-stroke. So if you fly just a few times per week, you can save the extra cost in fuel savings in just one season.

And you can say good-bye to that slime on your plane forever!