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Cars & Motorcycles
Dirt Rider

Dirt Rider October 2017

Get Dirt Rider digital magazine subscription today for dirt bike and off road bike reviews, riding tips and tricks, and the latest racing coverage.

United States
Bonnier Corporation
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In this issue

3 min.

We got a call from Feld Entertainment, the group that runs the Supercross series. This wouldn’t normally seem odd, but it was mid-July. I know the A1 hype starts early, but July? It turned out they were calling about another event they run, their Marvel Universe LIVE! stage show. The sequel to the superhero stunt show was kicking off , and they were planning a media day just over the freeway from Anaheim Stadium, in the Honda Center (where the Anaheim Ducks play). So we over-asked. We didn’t want to preview the show’s scene that they’d be showing that day—we wanted to test it. Fortunately, our newest associate editor, Andrew Oldar, competed in trials in the pro class, and since the heroes of the show ride trials bikes for their stunts…

8 min.
tough like toth

Josh Toth put his Connecticut rock-riding skills to good use en route to an impressive victory at the third annual Tough Like RORR extreme race in Tamaqua, Pennsylvania. Toth beat out KR4 Husqvarna’s Grant Baylor by four minutes and 18 seconds to claim the win, while Beta USA’s Jordan Ashburn finished another eight seconds back for third. Toth collected a nice $4,000 for his efforts. The two-day event, which is quickly becoming America’s answer to the Erzberg Rodeo, consists of two races on Saturday and one race on Sunday morning that serve as a prelude to the $12,000 Tough Like RORR finale held Sunday aft ernoon. Only the 50 fastest riders from the first three races qualify to participate in the final race, which is run on a treacherous 12-mile course…

1 min.
letter of the month

In my racing days, long before motocross came upon the scene, we had three engine displacement classes in which we could race. They were 250cc, 500cc, and Open class. Today, we have 250cc and 450cc classes. Can anyone tell me how the 450cc class came about? It just seems logical to me that it should be 500cc instead of 450cc. Ken Phipps Moxee, WA The rule book limit used to be 550cc, but when Doug Henry won the 1997 Las Vegas supercross on the all-new YZM400, it kicked off the era of serious four-stroke racebikes. Yamaha and KTM fielded four-strokes, with displacements up to 540cc from KTM, while Yamaha upped its bike to 426cc. As those teams proved how good modern four-strokes could be, and with other brands developing their own bikes…

1 min.
clutch shootout

TRAIL TECH 120-WATT HIGH-OUTPUT STATOR FOR 2016– ’17 KTM/HUSQVARNA MODELS: $144.95 Increase power over the OEM stator on your KTM or Husqvarna with this plugand- play replacement. trailtech.net (360) 687-4530 EVS SPORTS SPORT GLOVE (HI-VIZ): $21 Make your hands noticed with these easily perceivable slip-on gloves. REKLUSE RADIUSCX: $999 Save your left index finger with Rekluse’s new premier autoclutch system. It may come in clutch on your next ride. rekluse.com (208) 426-0659 ETHIKA X NITRO CIRCUS I BELIEVE-NITRO CIRCUS SERIES: $25 Release your inner daredevil with this undergarment from Ethika and Nitro Circus. ethika.com MOOSE RACING RADIATOR FIN STRAIGHTENER: $13.95 Keep your bike’s radiator fins cooling properly with this unique tool. mooseracing.com (800) 369-1000 SEAN BROWN, president of Rekluse, tells us how the final hours of testing prior to releasing the RadiusCX clutch to market involved some time behind the windshield. “We’re in Boise, Idaho, and we had record…

9 min.
smoother, slimmer, better 2018 yamaha yz450f

The YZ450F was our 2017 Motocross Shootout winner (February/ March issue), so when Yamaha came out with an all-new bike for 2018 we were excited to see if it raised the bar for the class even higher. A powerhouse since 2010 when the Yamaha engineers reversed the engine and created a straighter, downdraft intake, the new YZ450F gets a slightly straighter (more vertical) intake tract and higher-lift cams. The intake valves now open earlier, open farther, and stay open longer, with the aim of increasing midrange and giving a torquier character. Overlap, when both valves are open, has been increased in an effort to improve top-end and over-rev. The throttle body is now a Mikuni unit (a switch from Keihin), with a push-on cold-start knob that releases with a twist of…

7 min.
one year, one button, and three springs 2018 honda crf450r

The Honda CRF450R was all new last year and finished in the runner-up spot in our 2017 450 Motocross Shootout (February/March). While the 2017 bike was remarkably better than the previous-generation CRF450R, our test riders pinpointed a few areas they thought the bike could be improved upon. A couple of the reasons it didn’t win our shootout were that the 49mm Showa coil spring fork and shock were a bit soft, especially on big impacts. Also, the bike was occasionally difficult to start when it got hot. For 2018, Honda made revisions to these areas—and then some. ENGINE The two major changes made to the 2018 engine are revised ECU settings and electric start. With the addition of lithiumion battery-powered electric start, Honda removed the kickstarter as well. The Showa 49mm coil…