Sweet Tracker | Big Bore Hop-Up, Part Two

Here’s the rendering that The Harpoon did for me when the Sweet Tracker was just a twinkle in my eye. Now it’s getting that much closer to being done, thank god.

Here’s the rendering that The Harpoon did for me when the Sweet Tracker was just a twinkle

In the neverending quest to be the fastest mofo on the block, and the quickest off the line, there are many routes for souping up your air-cooled V-twin. The stock 883cc displacement in my Sweet Tracker project was about as fast as a golf cart so I needed to juice it up with beefier jugs, and of course a set of higher flowing cylinder heads from Revolution Performance would be a good idea, too. RevPerf advised that Harley’s Screamin’ Eagle .536 higher lift cams would be the way to go with the RevPerf setup, so because I can sometimes follow directions, I went that route. Last month, I focused on the installation of RevPerf’s 1,250cc cylinders and re-worked heads, and Screamin’ Eagle cams. In case you missed the article, log on to hotbikeweb.com for the whole shebang.

For this installment, I wanted to show you some of the options available for getting the air/fuel…in/out, all with the proper timing of course via a new ignition system. For my 2000 XL883 Hugger Sportster, Daytona Twin-Tec’s 1005S EX Ignition kit ($414.26) would serve as the perfect accompaniment for the engine performance mods I made. The 50-state legal 1005S EX includes the ignition module, single-fire ignition coil, plug wire set, and installation instructions with detailed wiring schematic, and works with ’98-03 Sportster models, except 1200S models. Daytona Twin-Tec ignition kits are available for virtually every type of Harley-Davidson motorcycle, but the kit I ordered offers adjustable advance, rpm limit settings in 100-rpm increments, and switch-selectable single- or dual-fire modes.

The following components were used because they’re awesome. SuperTrapp’s XR-750 style stainless steel high pipes, which feature the company’s disc tuning technology and mounting hardware; Daytona Twin Tec’s 1005S EX Internal Ignition kit, which includes the ignition, a new coil, and plug wire set.

The following components were used because they’re awesome. SuperTrapp’s XR-750 style stai

Without certain components working in perfect harmony, you’re never going to get the optimum output that your motorcycle is capable of producing. I did some research on carburetors and tapped performance gurus in the industry for advice, and most said that a Mikuni carb was the way to go for this project. Mikuni’s HSR42 » Easy Carb Kit ($448.99) includes everything needed for installation. The carburetor alone includes a two-piece throttle slide with stainless roller bearings, lighter throttle return spring, low-speed air screw, and enlarged needle valve and float bowl. Other components included with the kit are a new backing plate, adapters, mounting hardware, and detailed installation instructions. The HSR42 kit is available in different variations, one which includes an Evo-style air filter and air cleaner cover, and the kit that I used, which is meant to work with the stock “ham can” air cleaner cover, but you’ll need a new air filter.

Enter K&N Engineering, which manufactures top-quality air filters, air cleaner kits, oil filters, and more, for any and all powersports industries. With more than 40 years experience in the business, K&N’s technology is tried and true. Since the Mikuni kit I ordered didn’t include a new air filter, I took the bull by the horns and grabbed the H-D-1388 Filter ($73.01) for my specific application. Having used plenty of K&N products in the past, I didn’t think twice about the purchase. K&N’s cotton-gauze, washable filters include a lifetime warranty, and flow more air through the carb than stock applications. And because I’d probably need to put some new oil and a new oil filter on the bike, I ordered up one of K&N’s KN-170C Wrench-Off oil filters ($15.99) as well. It features a 17mm nut on the end of the filter so installation/removal is a snap. It also features a synthetic filter media compatible with synthetic and traditional motor oils that increases flow rates and improves filtration. I ordered the chrome version, which I intend to scotch-brite to stick with the no-chrome-whatsoever theme of the bike.