By Jay Clark
The goal of this project was to simply pin it. Jay Clark wanted to build the best two dual sports possible for himself and his son. Since they are the most popular bikes in the category, why not start with two KTM 500 EXC-Fs? Because what is the fun in that? The 350 EXC-F is lighter and nimbler, and Cylinder Works has a Big Bore kit for it that makes it a 366cc, but that difference, combined with the other mods, gives you a race bike feel on a dual sport bike.
We had two bikes for this project: a 2019 and a 2017. Race Tech did the 2017 motor and made over 50 horsepower! Twisted Development did the work on the 2019 model and their numbers were the same. The stock units are very corked-up with only 34 horsepower stock, which is fine for just cruising. We wanted to get a little more aggressive and make a race bike feel on a street legal dual sport bike.
Aside from the motor modifications, there were a few parts to making these bikes great. Weight was added to the clutch for more tractable power and less flame out incidents. Blais Racing made those weight kits and they are worth every penny. Also, the blinkers were a custom setup and tucked in with blinker relays. SAR made these and these are must-haves. SAR makes a number of custom plug and play items for the KTM EXC-F’s, and these make a big difference for the guy modifying his EXC-F. After a few trips on the trail you learn the things you want to change and after running your battery dead a few times, from keeping the key on, you will want to call them up. The switches for the lights and blinkers allow you run the clutch perch where you would like since it is slimmer and the same goes for the front brake side with the starter/kill switch.
We tested these on the mean streets and dirt of Perris, California. We cruised from Perris MX up through the city of Perris until we hit a dirt road. From there we chased trails until we found ourselves on top of a mountain looking down on the track. The power on these 350s felt like 500s. In fact, they may even be a little better. The throttle response is like a motocross bike and the power felt like a 350 SX-F, not an EXC-F. The power was most fun once we got into the dirt, as trails and obstacles we so easily negotiated. The power is sharp and strong, allowing you to power your way through anything. I’d put these up against a 500 EXC-F any day.
SAR Easy Fit Under Fender LED Tail Light and License Plate Mounting Plate, Clear Lens LED Turn Signals with OE Style Connector (Front and Rear), Smart Flasher – LED Turn Signal Relay, Direct Plug-in Dash Indicator Rewire Kit, Key Switch Eliminator (Allows you to take off the OE key switch), Over/Under Start/Stop Switch (Kill button does not lock down), SAR Keyed Kill Switch (A key switch that doesn’t kill the battery!), Multi-function Light Control Switch (OFF – LOW – HIGH)
2mm Big Bore Cylinder Kit 366cc, Includes Forged Vertex Piston and Top-End Gasket Kit
Vortex X-10 ECU & Mapping, Head Porting to Match the Big Bore Cylinder (2019 #101)
Suspension Re-Valve and Setup on Both Bikes, Head Porting to Match the Big Bore Cylinder (2017 #133)
SS Header, Alum F 4.1 RCT Muffler
Blais Racing Services
Clutch Weight, Smog Delete for Closed Course Competition Use
Front 14T, Rear 51T Gold Stealth Sprocket, Gold Enduro O-Ring Chain
Large Tank, Coolant Catch Can
Adjustable Light Mount with Dimmer Set Up (2019 #101)
Semi-Custom Graphics Kit with Toxic Yellow, Pre-printed Number Plate Backgrounds
Factory II Stand, Front & Rears Brake Caps, Clutch Master Cylinder Cap, Rotating Bar Clamp, Steering Stem Nut
AT81 Front (90/90-21), AT81 Rear (120/90-18)
Two Stage Air Filter
Rear Chain Guide
Hinson Clutch Components
Clutch Plates and Outer Cover
Custom Cool Seat Cover
Titan Throttle Tube, Grip Glue
603 Fat Bars, Grips
Bullet Proof designs
Rear Swingarm Guard, Radiator Guards, Rear Disc and Caliper Guard
Oversized Rotor/Adaptor Bracket, Complete Wheelset, Oversized Rotor Front, Rotor Rear, Brake and Sprocket Hardware
Clutch Cylinder Guard, Hand Guards
Full Plastic Kit Orange (2019 #101), Full Plastic Kit Flo Orange (2017 #133)
Carbon Skid Plate
Double Take Mirrors
Folding 4” Rear View Mirrors
Frame Guards, Two-Stroke Air Filter Cage
2019-2019KTM350EXC-Cudby-0013 Simon Cudby 2019-2019KTM350EXC-Cudby-0012 Simon Cudby 2019-2019KTM350EXC-Cudby-0043 Simon Cudby 2019-2019KTM350EXC-Cudby-0014 Simon Cudby 2019-2019KTM350EXC-Cudby-0016 Simon Cudby 2019-2019KTM350EXC-Cudby-0033 Simon Cudby 2019-2019KTM350EXC-Cudby-0027 Simon Cudby 2019-2019KTM350EXC-Cudby-0021 Simon Cudby 2019-2019KTM350EXC-Cudby-0022 Simon Cudby 2019-2019KTM350EXC-Cudby-0041 Simon Cudby 2019-2019KTM350EXC-Cudby-0026 Simon Cudby 2019-2019KTM350EXC-Cudby-0025 Simon Cudby 2019-2019KTM350EXC-Cudby-0015 Simon Cudby 2019-2019KTM350EXC-Cudby-0040 Simon Cudby 2019-2019KTM350EXC-Cudby-0001 Simon Cudby 2019-2019KTM350EXC-Cudby-0034 Simon Cudby 2019-2019KTM350EXC-Cudby-0037 Simon Cudby 2019-2019KTM350EXC-Cudby-0028 Simon Cudby 2019-2019KTM350EXC-Cudby-0030 Simon Cudby 2019-2019KTM350EXC-Cudby-0035 Simon Cudby 2019-2019KTM350EXC-Cudby-0038 Simon Cudby 2019-2019KTM350EXC-Cudby-0018 Simon Cudby 2019-2019KTM350EXC-Cudby-0017 Simon Cudby 2019-2019KTM350EXC-Cudby-0020 Simon Cudby 2019-2019KTM350EXC-Cudby-0031 Simon Cudby 2019-2019KTM350EXC-Cudby-0019 Simon Cudby 2019-2019KTM350EXC-Cudby-0024 Simon Cudby 2019-2019KTM350EXC-Cudby-0036 Simon Cudby 2019-2019KTM350EXC-Cudby-0042 Simon Cudby 2019-2019KTM350EXC-Cudby-0029 Simon Cudby 2019-2019KTM350EXC-Cudby-0023 Simon Cudby 2019-2019KTM350EXC-Cudby-0039 Simon Cudby 2019-2019KTM350EXC-Cudby-0005 Simon Cudby 2019-2019KTM350EXC-Cudby-0010 Simon Cudby 2019-2019KTM350EXC-Cudby-0004 Simon Cudby 2019-2019KTM350EXC-Cudby-0002 Simon Cudby 2019-2019KTM350EXC-Cudby-0003 Simon Cudby 2019-2019KTM350EXC-Cudby-0008 Simon Cudby 2019-2019KTM350EXC-Cudby-0009 Simon Cudby 2019-2019KTM350EXC-Cudby-0007 Simon Cudby 2019-2019KTM350EXC-Cudby-0006 Simon Cudby
ABOUT PRO CIRCUIT
Based in Corona, California, Pro Circuit Products, Inc. is a leader in off-road motorcycle and ATV exhausts and aftermarket performance parts. Started in 1978, Pro Circuit is the go-to shop for recreational riders and professionals for everything from suspension work to complete engine packages, and everything in between.
ABOUT NAMURA TECHNOLOGIES
Pistons and Gaskets Coming from decades of Powersports aftermarket manufacturing, Namura continues to impress riders and dealers alike with their aggressive development and innovative product design and manufacturing in MX and ATV Pistons and Gaskets. Based out of the suburbs of Minneapolis, Minnesota, Namura is taking piston quality and durability to another level.