• Yoshimura camshafts ground by Yoshimura Japan from Billet blanks
• 92mm Forged Yoshimura Piston
• Installed 5mm Offset Crank pin
• Bored Nikasil-Plated Cylinder
• Heavy-Duty Clutch Kit
• Head & Base Gaskets
• Yoshimura Racing Ignition Box (11K RPM)

450CC BIG BORE KIT	PART #	PRICING
Engine Kit Assembled	4500B	$2175.00
Kit parts ONLY w/Core Parts (*)	4500C	$1600.00

(*) Core Parts: Cylinder, Crankshaft, and Counter Balancer

• Machine gasket services
• Mill head to increase compression ratio
• Inspection and reassembly of top end
• Bottom end blue printing and assembly
• Stage 3 Port and Polish: Single-Cylinder
• ISF Transmission Process
• Knife edge and balance crankshaft
• Engine Dyno Break-In and Dyno Tuning

• Complete Race-Spec Engine build for all classes
• Installation of high performance engine components
  • Camshafts
  • Crankshafts
  • Connecting Rods
  • Pistons
  • Valve train components

RS-4 Exhaust Systems

The RS-4 Twin Pipe kit was previously only available as a custom system for Kevin Schwantz who was passionate about these pipes on his Super Motard bike. He wanted his bike to look like a "Hot Rod" and have a "cool" factor. We obliged and one of our most sought-after-yet-unobtainable pipes was created, which, up to now, was not available to the general public. For 2009, Yoshimura is offering these incredible “Twice Pipes” which are completely fabricated by hand and TIG welded to perfection. They certainly sit at the high end of what is available for the mighty SM... but that's what Kevin wanted! The pipes have a stainless steel header and Y pipe mated to twin carbon fiber RS-4 mufflers for incredible looks and performance. The kit also comes with a custom Yoshimura kick-stand.

RS-4 Twin "Twice-Pipe" Applications:
2005-2009 DR-Z400SM

RS-2 Exhaust System

The RS-2 is a great all around pipe. It has good ground clearance, is lightweight, gives you big power gains and looks really good. Plus, it comes with all the nice little touches and features that make Yoshimura famous. The plasma cut heat shield with our Yoshimura logo, high quality chrome steel exhaust springs and even spring vibration dampers with the Yoshimura logo molded in.

Applications:
2005-2009 DR-Z400SM
2000-2009 DR-Z400S

Camshaft/Ignitor Kit for DR-Z400SM

Once this sucker is punched out and stroked, it’s time for a little bit of fun. Yoshimura's billet camshaft/ignition kit gives the SM a ton of over-rev and a whole lot more power. The power delivery is smooth, but it hits like a ton of bricks and builds to the moon.

Applications: 00-09 DR-Z400SM/S/E
Part Number: YSPCR3
MSRP: Call to order

MJN Carburetor for DR-Z400SM/S

New for the DR-Z400 is Yoshimura's MJN Carburetion System. The MJN nozzle controls the amount of fuel in proportion to the throttle opening (intake air) by accurately drilled and positioned fuel intake jet orifices. This results in more efficiently atomized fuel, and gives better throttle response as well as better fuel efficiency overall. Also, the MJN system supplies the fuel through the MJN nozzle in the center of the bore where air speed is the fastest. This atomizes fuel even better!

Another very important benefit of the MJN system is when the throttle is shut off and engine braking occurs, a very minimal amount of fuel is guided into the intake ports. Therefore remarkably crisp throttle response is obtained, upon corner exit, and transition back to 100% throttle settings.

Applications: 05-09 DR-Z400SM / 04-09 DR-Z400S
Carb Model: TMR-MJN40
Part Number: 798-126-2910
MSRP: Call to order

Required Parts:

• Yoshimura Throttle Holder Set (pictured)
• Coolant Reserver Tank Stay (Part Number 761-125-0300)
• Insulator Hose Band (Suzuki STD Part) In case of removed air filter. Intake Part Number: 13111-29F00 Carb Part Number: 09402-58208

BMC Air Filter

These filters are made from the best materials, designed by top flight engineers, and represent the cost of victory in modern day racing. BMC filters offer maximum protection from dirt and debris entering your engine through the airbox. The filters also offer up superior air-flow for increased power at all RPM levels. BMC filters are washable and feature close tolerances, maximum filtration area, and long lasting durability.

Oil Breather Tank Kit

If you plan on taking your SM all the way, then you'll definitely need this. It not only looks ridiculously trick, it is! This Oil Breather tank is necessary when using with the BMC Funnel Filter, but it can also be used as a stand-alone unit.

Applications: 05-09 DR-Z400SM
Part Number: 532-001-0000
MSRP: Call to order