Browsing Tag

Four-stroke

SUZUKI VANVAN

-- Return of the fat bikes? -- Test impression by the staff of Dirt Wheels We recently did a short feature on the internet dealing with the short-lived, fat-tired Honda Fat Cat two-wheeler. The response was incredible! That response brought back memories of hitting the dunes and trails on the Honda Fat Cat and the Yamaha BW80, 200 and 350. We had those machines in mind while returning our Suzuki KingQuads. We noticed a small fat-tired motorcycle that Suzuki says is an “extraordinarily retro, funky machine”—the…

FOUR- STROKE TEAR- DOWN TIPS

-- There is nothing to fear -- By Allen Knowles  and staff of Dirt Wheels When performance quads were two-strokes without power valves, rebuilding an engine was relatively cheap, even with labor included. Modern two-strokes with power valves are definitely more expensive to work on, but those are not available for quads unless you are willing to build your own. With modern quads, it doesn’t matter whether you are working on a sport quad or a 4x4, you will be working on a four-stroke. Costs soar with the increased…

2019 YAMAHA RAPTOR 700R

-- Testing the best-selling sport ATV of all time -- By the staff of Dirt Wheels Yamaha has so much love for sport ATVs that they keep the best-selling ATV in the category on dealer floors for you to buy today! It’s no secret, the struggle of the economic downfall in 2008 hindered the market and kick-started the decline of sport quads. Compounded with the rise in UTV technology, the sport ATV category had its heyday. Now we consider certain 4x4 machines sport models. Honestly, those 4x4s are very sporty in our…

2019 YAMAHA YFZ 450R

-- High-Performance ATV Test --  By the staff of Dirt Wheels Yamaha’s YFZ450R isn’t simply a sport quad, it’s an experience. The smooth body lines fade into aggressively angular points, so the YFZ looks fast and focused just sitting still. But, you don’t really get the thrill until you firmly depress that little start button. The EFI and the ignition brings the Yamaha YFZ450R’s potent powerplant to life. To further intensify the excitement, shift into gear, boost the rpm and release the clutch. We have been seeing…

CUSTOM SUZUKI LTR535

-- MODIFIED 2006 SUZUKI LTR450 -- Keenan Damery didn't want his Suzuki 450 to look like all the others, so he set out to change it up with a unique visual idea in mind. Along with the special forces military theme he also made sure his Zook had the performance hardware to match the serious appearance. The stock 450 motor was punched out to 535cc, the head was ported and got hotter cams and valves. It has Dasa intake and exhaust with a PC3 programmer. The transmission gears have been back cut for positive lock.…

BARKER’S RAPTOR 700 FULL EXHAUST TEST

 -- By the staff of Dirt Wheels --  We have tested quite a few exhaust systems from Barker’s Performance, including a Raptor 700 dual exhaust. This time around we got our hands on the new single full system with a cylindrical muffler instead of their well-known oval style. We chose to have blue-and-yellow accent parts included on the system and ordered up an EHS Fuel Controller (for closed-course racing only), along with a spark arrestor. The complete setup goes for $844. CONSTRUCTION AND INSTALL This Barker’s…

GEAR GRINDER: DYNOJET POWER COMMANDER V & AUTOTUNE

-- Fueling our race-ready YXZ’s thirst, By the staff of Dirt Wheels -- Our YXZ1000R SS creates decent power at around 112 horsepower from the crank, but it’s not enough to holeshot the competition at a WORCS race. You may recall that we installed a full Akrapovic titanium exhaust on this machine, and when you install an exhaust for closed-course racing, you need to add the correct fuel mapping or you could damage the engine. Since all the new performance UTVs and ATVs are fuel-injected, simply changing out a jet…

5 BEST UTVS: Our top Sport UTV choices from 2016

There is no doubt that 2016 was a great year for the release of aggressively fast sport UTVs. Can-Am released a faster Maverick Turbo 1000, Polaris blew us away with their 144 horsepower RZR XP Turbo that is the fasted production model UTV from the big manufacturers, they also released a RZR 1000 S. Yamaha brought out their YXZ1oooR which made huge strides in the industry and even the Arctic Cat Wildcat Sport 700 was released originally as a 2015 model, it still is marked down on our list of favorite sport UTVs. Linked below…