Listen, you can have a perfectly tuned engine. This does not come from an ego thing but simply reading the fine print in the manuals which most ignore. All my engines run perfectly and some are even inverted and not one deadstcik due to tuning in years. it's a very simple process.

First, tune your engine as best as you think you can. But after you do this, how do you know what you did had any effect? By running a test on it, primarily these checks are to get the low end right. The high ends is generally a no brainer.

So you have the engine at an idle. Carefully remove the fuel line from the carb nipple or if you really can't, then pinch the line closed and wait for the engine to quit running. You need to carefully listen to the rpms. This is very important. If the rpms increase as the engine quits, your low end is to rich. If the rpms, just go down and quit, low end to lean. I usually try and get mine at a very slight increase.

With this. I rarely need to reset my low end in any given season and I have a perfectly tuned engine and they fly that way.


As for the high end, I really don't use the pinch/release method on th fuel line, mainly since most of my engines are cowled. But I help out others whos engines are exposed. If your high end is to lean and you do a pinch test, the engine wil probably quit when you pinch the line. I usually try and get it with a "no change" in rpms and it seems to be fine for them.