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Old 01-15-2002 | 01:23 PM
  #6  
Steve Campbell2
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From: Baton Rouge, LA
Default Throttle Setup Question

<<it all depends on what your personal preferences are...>>

There it is. Like anythng else on these infernal machines, the throttle set-up can be done many ways.

The reason for the "concentration" on ATVs is due to computer radios. Back in the days of pot radios, the thing to do was "box up" the throttle linkage- IOW, imagine a parrallelogram (sp?), the four corners of which are the ball on the throttle arm (Point A), the ball on the servo arm (Point B), the center of the servo output shaft (Point C), and the center of the engine throttle arm (Point D). The distance between A & D are the same as between B & C; the distance between A & B is the same as between C & D. At 50% servo throw (half stick), the throttle barrel is half open, and everything is ninety degrees to each other (a perfect rectangle). This can be a real PITA to acheive; but it was worth it. I still do it this way.

The idea behind all of this was to eliminate differential throw at either end of the travel, so you ended up with a smooth engine response. Computer radios and adjustable ATVs have made this easier to do, but too many folks are just punching buttons until they get, as stated above, a closed throttle at one end and an open one at the other. It's not that simple. You might get lucky doing it this way, but if you have 70% ATV at one end and 125% on the other, your engine response will be FUBAR and your throttle curve will look like a snake.

Nothing is graven in stone. People like to use whatever Curtis is doing as an example. Curtis, for many years, preached the "box-up" method described above. Now, I hear he is running a longer servo arm (thus losing the "perfect rectangle").

Governors as a solution? Sure; until it pukes on you. Then what? If you don't have a good set-up as a back-up, you've now got a serious problem. Technology is nice; but nothing can take the place of a good mechanical set-up.

Steve

P.S.: I just read Ron's piece on his site. His drawing is better than my words...<G> But that's what you want to achieve. I also think that if you miss the 100% ATV goal, no big deal- AS LONG AS BOTH ATVs ARE THE SAME.