2005 Mountain Motor Sports Custom Chopper - Supercharged Sin

When a company decides to build a bike to enter in shows and grab people's attention, they try their best to showcase their abilities with a no-holds-barred attitude. Usually, the company is then restricted by budgets and time, and they end up with a more mild and conservative bike that is more likely to sell after the show. This was not the case when Kevin Brooks, owner of Thunder Mountain Motor Sports in Mount Shasta, California, decided to build a truly radical show bike. He really went all out and spared no effort or expense in the process.

Kevin started out by designing a frame for the new (at the time) Avon 300mm tire. He also wanted it really long, so he designed a frame with 57 degrees of rake in the neck, 7 inches of stretch in the backbone, and 6 inches added to the downtubes. Diamond Chassis was able to build the frame to Kevin's exact specifications. Once the frame was back in the TMMS shop, they built an air dam into the chin of the frame that features oil lines run inside of the frame tubes, plus the frame houses one of TMMS' new oil venting systems (patent pending).

The frame needed to become a roller before he decided on what motor to use, so Kevin shopped around for a wheel company that had a rim large enough for the 300mm tire he planned to use. Xtreme Machine happened to have their 15th production wheel wide enough for use with a 300 series tire for sale with a matching narrow 21-inch for the front. Suspension duties were handled by a set of Legend Air Ride shocks bolted to the swingarm in the rear, but the front was another job altogether. In order to get his rake and trail within reasonable limits, he was going to have to rake the triple-trees, not to mention a super long front end as well, way over stock dimensions. Mean Street was able to accommodate Kevin's needs and fashioned him a one-off front end 27 inches over with 7 degrees added to the custom triple-trees for a total rake of 64 degrees.

With truly radical in mind and a need for a motor in hand, Kevin went straight to one of the top motor builders in the nation, Nigel Patrick of Patrick Racing. Kevin picked up a fully polished, billet cylinder and heads, a 125ci unit with Patrick Racing's Twin Mikuni carburetor intake and fit it into the frame. A Patrick Racing motor has a lot of power and looks incredible by itself, but it was not enough for Kevin--he had to have more radical. He only had a few choices when it came to something more radical than a Patrick motor, either a turbo or a supercharger, so he went with a polished Magnacharger supercharger. Providing spark for the motor is a Nology coil and a Crane Hi-4 ignition system. (For the record, when he runs 118 octane race gas and 12% nitro methane, the motor puts out over 200hp!) To get this monster motor's power to the ground, he routed it through a Hitech 4-inch open beltdrive and an Accessories Unlimited right side drive six-speed transmission.

With the major components already pieced together on the roller, Kevin and the TMMS crew got to work on the sheetmetal aspect of the build. They created a custom oil bag for the electronics and battery, a crazy stretched gas tank, a unique internally-strut rear fender, and the previously mentioned air dam/oil bag. Custom handlebars and hand controls were created in-house along with custom pipes and intake for the dual carbs.After all the custom sheetmetal was finished, Kevin went to his painter, Bill "Long Hair" Brown. He laid multiple coats of Coral Red, and a variety of Candies to get the deep and rich color on these pages. Even the seat is radical with exotic animal skin from the land and sea; real alligator skin and stingray.

In the end, all of Kevin's hard work and careful planning paid off for the bike, now affectionately named "Sinful" for all the sheetmetal's curves. He entered the bike show contest in Laughlin, Nevada, in 2005. The bike took first place and put TMMS on the map!