A big-bore is good for a vet guy who wants the lightweight feel of a 250F, but maybe not the power of a 450. Also, for some less honest people out there, this could be a less expensive option, rather than building a full-on race engine. Jay Clark does a ton of these builds, but he wanted a bike he could use to beat up on his buddies on any given weekend.
Test/Text: Kris Keefer
Build: Jay Clark
PRODUCTS & SERVICES USED:
CYLINDER WORKS
3mm Big Bore Cylinder Kit 269cc, Includes Forged Vertex Piston and Top-End Gasket Kit
www.cylinder-works.com
TWISTED DEVELOPMENT
Vortex X-10 ECU & Mapping, Head Porting to Match the Big-Bore Cylinder (valve seats cut)
www.td-racing.com
FMF RACING
Full Ti Megabomb with RCT 4.1 Muffler
www.fmfracing.com
RACE TECH
Suspension Re-Valve and Setup, Install of Technical Touch KYB Conversion Kit
www.racetech.com
FASTER USA
Complete Wheelset
www.fasterusa.com
SUPERSPROX
Rear Sprocket 51T, Front Sprocket 14T, Gold MX Race Chain G520-MXT-L-120
www.supersproxusa.com
UNI FILTER
Two-Stage Air Filter
www.unifilter.com
ICW
Radiator Straightening and Bracing
www.icwbikestands.com
ALL BALLS
Throttle Cable
www.allballsracing.com
DUNLOP
MX3S Front (80/100-21)
MX12 Rear (110/90-19)
www.dunlopmotorcycletires.com
ODI
MX V2 Lock On Grips, Podium Champ Bend Bars
odigrips.com
WORKS CONNECTION
Brake Caps, Works Stand II, Brake Rotating Bar Mount, Engine Plugs, Axle Blocks, Pro Launch Start Device
www.worksconnection.com
UFO PLASTIC
Full Plastic Kit in Black, Mud Flap, Chain Guide, White Frame Guards
www.ufoplasticusa.com
SAN DIEGO POWDER COATING
Sandblasting, Powder with Super-Durable Clear, and Race Prep Masking
www.sandiegopowdercoating.com
DECAL WORKS
Semi-Custom Graphics Kit, Preprinted Number Plate Backgrounds
www.decalmx.com
TECHNICAL TOUCH
KYB Conversion Kit for AER48 Forks
www.technicaltouchusa.com
GALFER USA
Oversized Rotor/Adaptor Bracket, Rotor Rear, Brake Pads Front and Rear
www.galferusa.com
TM DESIGNWORKS
Rear Chain Block
www.tmdesignworks.com
HINSON CLUTCH COMPONENTS
Full Clutch Kit (Basket, Inner Hub, Pressure Plate and Fibers, Steels and Springs with Cover)
www.hinsonracing.com
PIVOT WORKS
Steering Stem Bearing Kit, Linkage Bearings
www.pivotworks.com
MOTOSEAT
Custom Cool Seat Cover
www.motoseat.com
FASST CO
Rear Brake Return Spring
www.fasstco.com
SCAR
Titanium Footpegs
www.scar-racing.com
VP RACING FUELS
T4 Fuel (can run on pump fuel as well)
www.vpracingfuels.com
ABOUT DECAL WORKS
Founded in 1989 by Ron and Janeen Joynt, DeCal Works has been the industry leader in pre-printed decals and custom graphics for 30 years. With a passion for racing and innovation, DeCal Works has, since its early days, focused its attention on high-quality products with great customer service.
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