Project Recycle- Honda Shadow ACE 750- Cobra Jet

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COBRA JET KIT

POur great experiment, trying to make do the stock jetting components in the Honda Shadow ACE 750, has ended. Inside the two Keihin carburetors you’ll find a Cobra-branded (and Dynojet-developed) jet kit. Each kit contains new adjustable-height needles, a small assortment of main jets, two drill bits and instructions. The drill bits are to remove the cover on the pilot mixture screw (already done on our bike) and to increase the diameter of the slide lift hole; this orifice helps determine how quickly the vacuum-operated slide moves in response to changes in throttle position and engine load.

After wrestling the carbs out of the chassis—not the easiest task with the ACE—we began the installation process. The main jets are simple. Remove the old ones, screw in the new ones. Cobra provides four main jets with this kit, all different sizes—DJ098, DJ102, DJ106 and DJ110. The instructions don’t specifically say what to do when retaining a stock exhaust, so we went with a hunch and installed the smallest two mains. The instructions also say to stagger the jets, with the smaller jet (lower numerically) in the front cylinder.

According to the directions, you’re also supposed to install the needle with the clip in the #2 position, one down from the uppermost slot. The higher the clip the lower the needle rides, which makes the part-throttle leaner. More on this in a moment.

Wrapping up the installation, we set the idle-mixture screws as recommended, 2 turns out on the front cylinder and 2.5 turns out on the rear.

Road testing revealed that our choice for the main jet was a good one. The bike pulls well at wide-open throttle. However, in the as-recommended setup, part-throttle response was poor. Because the engine would occasionally pop and miss, we diagnosed the condition as too lean. Chalk up another hour to get the carbs off, two minutes to reset the needles to the #3 groove (the third groove from the top), and another 45 minutes to reinstall the carbs. Another road test and, magically, the bike is better. A further bit of fine tuning, winding out the mixture screws by another half turn each, found the Shadow running better than ever.

One last setup note. We tuned the bike for moderate temperatures at sea level. In high temperatures or up at altitude, the Shadow might prefer the recommended needle position.

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