![]() ![]() According to Arens, robotic Mig welding offers a stronger weld than Tig, with better control over heat and penetration. The Arens product is a robotic Mig-welded, tubular, chromoly frame with a removable subframe. They were just as sought after as a Roll Lobo or Leagers Pro Trax frame. At that time, Arens frames were considered the strongest out there. ![]() CT also supplied the CFM Performance ATV airbox ($109.95) and Twin Air foam air filter ($65) for this project.īack when we first built this 1989 250R racer, we sourced an Arens chassis. CT offers many upgrades to the package, such as painting or polishing the motor, and has many add-on trinkets for bling, like billet water-pump covers, ignition covers, case savers and Hinson quick-change clutch covers. (They have shipping instructions with photos showing you how to package and ship on The complete motor package includes the motor work, a CT Racing pipe and silencer, Delta V-Force 3 reed cage, intake manifold, Keihin carburetor and a throttle cable. To get the motor built, all we had to do was remove it from the frame and ship it off for our complete motor. They will sell any of the parts separately, even top ends unported for the do-it-yourself builder.įor our build, being a West Coast quad with lots of sand areas to ride, we went with the 350 motor (non-Power Valve) package. The Power Valve version adds a valve that blocks off the top of the port at low rpm, and then pops open as throttle and rpm are added this simply widens the power curve.ĬT offers packages that include splitting the cases, rebuilding or replacing the cranks, main bearings and seals, along with a full bottom-end inspection. It’s basically the 350 with a 4mm stroker crank added. The good thing about older two-stroke engines like this is, if all you needed to do is freshen up the motor, you could do it for under $500 for piston rings and a cylinder bore. The 350cc package we used is a little more aggressive while still having an MX-style power curve, which is also great for sand use. The 330 is the do-everything motor, for MX, XC, trail and sand. The 250 and 310 are the only packages that don’t need the cases modified to accept the larger cylinder sleeve. The 310 is the bolt-on package if your bottom end is solid and you just want to kick the horsepower-that’s a great way to go. In 1995 the interchangeable dome head was developed to go along with the ProX cylinder, and in 2012, a complete billet head was added.ĬT Racing offers seven versions of the ProX cylinder: 250cc, 310cc, 330cc, 350cc, 370cc, 350cc Power Valve and 370cc Power Valve. Not only is the ProX cylinder CT Racing developed a good replacement for hard-to-find stock cylinders, it was built with some of the same performance aspects Honda was putting into their top-of-the-line dirt bike engines, such as boost ports, O-ring heads, triple exhaust passages and increased water capacity. To date, there have been over 6000 ProX cylinders produced. The race wins and championship totals of racers using a ProX Cylinder around the world are endless. The ProX cylinder has proven itself as a reliable addition to the 250R. This product, along with the rest of the aftermarket, kept the 250R as a competitive race machine. In the early 1990s, CT Racing designed and developed the ProX cylinder. ![]() This former race quad has been stored for over five years and now returns as an awesome trail and dune quad. That leads us to our current project machine, a complete restoration of an old 250R that some of the Dirt Wheels crew used to take to the races. ![]()
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