Note: This is a specialty product and is not currently available for purchase online. Please call Duncan Racing International and a DRI staff member will assist you by collecting the required specifications and placing your order. Thank you.

All DRI Camshafts are made in the USA to ensure the best quality. Camshafts are available in different power curve options to fit your riding and racing needs.

CAM TYPE: Hardfaced made in USA.

CORE REQUIRED: Stock Camshaft.
GRIND OPTIONS
X3H Grind Camshaft
Part #: MC-280-X3H
Specifications: "All Around" Cam, Lift: .452"/.429", Duration 276°/274°
Application: Motocross/Sand Dune Riding
Notes: 1, 4

X14H Grind Camshaft
Part #: MC-280X14H
Specifications: Maximum Top End Cam, Lift: .452"/.412", Duration 292°/294°
Application: Drag Racing/TT
Notes: 1, 2, 3, 4

IMPORTANT NOTES

1.HD Valve Springs are required for this camshaft.
2.Shortened Bronze Guides are required for this camshaft.
3.New or modified piston required for this camshaft. Additional valve pocket relief in piston is required due to increased camshaft lift.
4.Customer must send in stock camshaft core. If no core is supplied, customer must pay core charge of $215.00

CAM SPROCKETS: These cams use stock OEM cam sprockets or aftermarket slotted/adjustable cam sprockets.

ROCKER ARMS: The cams uses stock OEM rocker arms.

COMPRESSION RELEASE: These camshafts use the stock OEM compression release mechanism installed and set as per the OEM Yamaha service manual.

NOTE: A modification to the compression release lifter may be required. Call DRI for additional details.

CAMSHAFT ACCESSORIES
80-80030 Heavy Duty Valve Springs w/Titanium Retainers $229.00
80-80040 Shortened Bronze Guides Intake 19.95ea
80-80050 Shortened Bronze Guides Exhaust 19.95ea

CAMSHAFT NOTES
All camshafts will offer their maximum performance when used with a professionally ported cylinder head and professionally cut valve seats.
IMPORTANT NOTE When installing a high performance camshaft it is the responsibility of the engine assembler to check and confirm that the piston to valve clearance is adequate. Minimum clearance is .060" from valve to piston at peak lift. Tolerances can and will vary from engine to engine. There is not substitute for checking that these tolerances are correct. This is especially critical when mixing camshaft and pistons from different engine builders. One of the correct and easiest ways of checking this is by using the "claying the piston dome" method.
Call DRI or consult a professional technician.

What is the difference between a billet and hardfaced cam?
Billet cams are sold outright with no core required. They are machined in the USA and are specially heat-treated for wear resistance. Billet cams are used when problems arise in the hardfacing process of stock cams.

Hardfaced cams are made from stock cams. In the hard facing process, stock cam lobes are welded with a hard surfacing alloy to increase durability as well as provide additional stock for high-lift profiles. The stock cam (or stock core) can then be ground to almost any desired lobe shape.

Some models such as YFZ 450 prohibit this type of modification because cam journals can distort in the welding process.