[77newell]

Steve's diagram of the wiring is exactly as my 77 coach was wired. Be aware that if you have a two stage Jake setup, the positions of the micro-switch and the dash switch will be reversed, with the dash switch being a three position (off, half the cylinders, all the cylinders).

Also be aware that the "buffer switch" assembly performs two functions on the Detroit mechanically governed two stroke engines: 1) it turns the Jakes on and off, 2) minimizes or eliminates "rolling" (a small amount of hunting) of the engine speed at idle. Whether or not #2 is true with other mechanically governed engines is unknown to me.

Steve's description is really helpful. I would reiterate one caution. When you have finished messing with the adjustments and are testing how it is working, rev the engine up only enough so that when you drop it back to idle the Jakes kick in. If the adjustment is such that the Jakes come on before zero fuel is reached the sound generated, at least on my engine, was loud and I'm sure it was an indication of extraordinary stress on the exhaust parts. I would not want an extended period of that happening. When operating correctly, the sound of a two stroke in Jake mode is one of the coolest on the planet to my ears;GRRRRRRrrrrrr!