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JMR Customs CB450

By Anthony van Someren - 14 Jan 13

  • Category_Bikes
JMR Customs CB450
Josh Mott is 22 years old and owner of JMR Customs in Boise, Idaho. He's a third generation mechanic, racer, and bike builder. Josh has been racing for 10 years in many disciplines including flat track, arena-cross, enduro-cross, and desert racing, and currently races the National Hare & Hound series. So, it's fair to say, he knows how to ride! From a very early age Josh helped his father (Randy Mott) repair, service, and build custom motorcycles. Notable achievements include building a 1200 Sportster that ran an 11 second quarter mile, and restoring a 1964 Greeves Challenger. As josh puts it; " I find a great deal of influence from custom styles: café, street trackers, bobbers, and basically any one-off custom motorcycle." This 1982 CB 450 Honda Nighthawk was originally picked up to part out and sell parts on eBay. It was roached beyond belief with bent forks, a wiring harness that was stripped, and a missing fuel tank. Out of curiosity Josh decided to check the compression and spark to see if it might be salvagable. It had 175 psi in both cylinders and a spark, so he decided to clean the carbs and it fired right up. "I had an idea that I wanted to put a motocross front end, lowered down, on a café style build. I had a 2006 YZ250 Yamaha front end sitting at the shop waiting for a project at the time, it was perfect. I ended up lowering the forks 7 inches to get the right height. As I finished this portion of the build I then had the idea to mount a mono shock. I used a 2005 TT-R 250 Yamaha shock because it fit really well in the small space I had to work with." Josh cut the whole back half of the frame clean off to begin the custom portion. He had the older Champion flat track frames in mind where the frame was exposed right below the rear fender, with the seat portion sitting within the frame. The overall bike length looked shorter than he wanted so he cut the frame by the headset and raked it from the stock 28 degrees to a custom 34 degrees. From there, he center-mounted the fuel tank, which involved cutting the top of the tank out, so while he was there he mounted a sleek, flush mount gas cap. Custom exhaust pipes were made to fit some aftermarket Ducati mufflers, making the bike sound like an older triumph. The wiring harness was custom made before Josh installed the motor, with key switch flush mounted on the right side of the frame and a start button on the left. There’s a small switch dashboard-mounted under the coil and tank with high low beam and light switch. A box mounted beneath the motor holds the battery, starter solenoid, fuse box and regulator rectifier. For a speedometer, Josh used a Trail Tech Vapor and made a clean mount to hide all the wires. Finally Josh stripped the motor all the way down to replace the cam chain, rings and gaskets. While he was in there he also cleaned up the intake and exhaust ports in the head. A Magura hydraulic clutch for a KX 450 was installed to replace the stock component. "I’m very stoked on how this bike came together. It’s very unique in the sense that there’s really no name for what type of build it is. It has elements of café, motocross, and street tracker all rolled into one. Thanks for looking and please check out www.joshmottracing.com or like us on Facebook for current builds." Also check out this video on Youtube
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