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Pipe Dreams: the epilogue, the epilogue

August 11, 2007

Zooming through the twisties in Interlaken Park, the PX is running at full song. The sensation of flogging is nowhere near what it would’ve been pre-Sito Plus.

Yesterday afternoon, I checked the spark plug. The electrodes and insulator have turned the light chocolaty brown that indicates an ideal fuel mixture. That evening’s Monkey Run would be the perfect test, I thought.

So here I am, mid-pack and headed toward an unspecified location on Capitol Hill. The sensation of the engine running out of breath is no longer an indicator to shift, but there is no longer a need to rev it that hard, either. The fuel gauge, which was pointing at the quarter-tank mark at the beginning of the ride, hasn’t moved appreciably in spite of all this 2nd- and 3rd-gear running up and down hills.

To review: air corrector jet-150, mixing tube-BE5, main jet-103. If you live somewhere with an elevation similar to Seattle (not much above sea level), try this and see how it works for you. I make no guarantees, and if you live at a higher elevation, you’re on your own…

UPDATE: The first full tank of gas on the new jetting yielded 71.78 mpg. I’d previously been getting 75-80 mpg, but keep in mind I’d been doing a lot more wide-open throttle stuff lately in testing the engine’s limits… not to mention the Monkey Run. In theory, any potential increase in fuel consumption could be offset by being able to use a higher gear, i.e. 4th vs. 3rd, in certain situations like climbing hills. Favicon

One Comment
  1. August 11, 2007 9:43 am

    I really like the Pipe Dreams series. It keeps me completely enthralled. Great writing, Orin!

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