PERFORMANCE, REPAIR & SERVICE of all Honda models, including TRX 250R, 250X, 300EX, 400EX, 450R, CR/CRF 250, 450, 500, and XR400.

• Piston kits from Athena, JE Pistons, LA Sleeve, ProX, and Wiseco available in any bore size.
• Complete and top-end gasket sets available.
• Our Cylinder Porting offers increased torque and horsepower gains throughout the RPM range by improving the flows of air and fuel through your cylinder head.
• Re-sleeve your stock cylinder - our machinists do the work
• 3-Angle Valve Jobs - standard or oversize
• Full Race Preps - make sure your quad is ready before every race, ask about our race prep services.
• Factory Honda parts available.
• After-market parts & accessories - if not in stock, most only 1-2 days away.

BIG BORE ENGINE MODS by Model

NITROUS KITS

The Boondocker Nitrous System uses a patent pending nitrous manifold that injects nitrous before the carburetor into the air intake and at the same time pressurizing the carburetors to increase the amount of fuel being vaporized. This results in an effective horsepower increase because the amount of nitrous being injected is matched by additional fuel. A push button switch located on the handlebars activates the nitrous - 15 or 20 shots available. The amount of nitrous being injected can be adjusted on the manifold so it can be set up for different applications and riding types.

• Dry shot Nitrous system uses carburetor pressure to adjust fuel automatically as needed and is totally adjustable for your personal application.
• Nitrous manifold automatically adjusts fuel for variances in bottle temperature
• Solenoids run off of the stock electrical system so no battery is needed
• New Polished bottles available
• Easy to adjust by turning a screw on the Nitrous manifold
• Kits come with brackets custom designed for each application
• EFI kits available!

We are a NOS refill station too!

INTAKE

K&N Air Filter:  Stock replacement air filter.  Ideal for extended use in dirty and dusty off-road riding and provides clean carburetion even at high altitude. As a rule, no jet changes are required with just a K&N filter element and these are washable and reusable.

A K&N Service Kit has everything you need to keep your new K&N clean and oiled and working properly.  It comes complete with both K&N Air Filter Cleaner and K&N Air Filter Oil, $14.95.

Dynojet Jet Kit - for mildly tuned machines using the stock airbox with stock or aftermarket filter, may also be used with a good aftermarket exhaust system.  Dynojet Jet Kits increase power and smoothness throughout the entire rev range, and are a simple and affordable solution to all your carburetion problems, $59.95.

EXHAUST

Complete exhaust systems, slip-on mufflers, quiet core inserts, exhaust springs, exhaust packing, even a dent removal service.  You name it, we've got it.  Give us a call and let us know what you want and need for your Honda.  We can help!!

SUSPENSION

• Shock Rebuild, Revalve and Respring for all models - all work done in-house by our qualified technicians.  Get your shocks set up for your weight and riding style!
• After-market shocks, a-arms, swingarms & suspension products available, both stock length and long/travel
  • Custom Axis
  • Elka Suspension
  • Fox Racing Shox
  • IMS / Roll Design
  • Lone Star
  • Race Tech
  • Walsh Racecraft
  • Works Performance

ENGINE 

TRX250R / ATC250R

Complete Cylinder Big Bore Kits for your Honda TRX 250R, fits 1985-1989.

• 310 kit: Includes cylinder, head, piston and gasket kit, $1099.
• 330 kit: Includes Cylinder, Head, Piston and Gasket Kit. *Note: Your engine cases will require boring for this kit, $1199. 

Big Bore Kits, Spacer Plates for long rod and short rod motors, complete Gasket sets for all TRX and ATC 250R applications.

TRX300EX / TRX250X

Big Bore Kits for your Honda TRX 300EX, fits any year.

• 313 cc Bore Kit. Includes Piston Kit: 78mm Forged Piston (choice of compression 10.5:1, 11.5:1, or 13:1), sleeve, pin, rings, circlips, headgasket. Requires: Resleeving of stock cylinder and rejetting. Note: Compression > 11:1 requires race gas. 300EX starter may not work with compression ratios over 11:1.
• 329 cc Bore kit. Includes Piston Kit: 80mm Forged Piston (choice of compression 10.5:1), sleeve, pin, rings, circlips, headgasket. Requires: Resleeving of stock cylinder, engine cases machined, and rejetting.
• 352 cc Stroker kit. Includes Piston Kit: 80mm Forged Piston (choice of compression 10.5:1), sleeve, pin, rings, circlips, headgasket. Includes Stroker Kit: +4.5mm Stroke, Camshaft, Valve Springs, Carb Kit & Airbox Lid. Requires: Resleeving of stock cylinder, engine cases machined, and rejetting. Rod Assembly must be in like-new condition -- send your crank for mods. Recommendations: Engines operating at or near sea level may run better with a race gas mix. Either a White Brothers E Series or Supertrapp IDS2 complete exhaust with this kit.

TRX400EX / XR400

• 416 big bore kit, includes JE Piston kit and Cometic top-end gasket kit.  Compression ratios 10.8:1 or 12:1, kit price $249
• 426 big bore kit, includes JE Piston kit and Cometic top-end gasket kit.  Compression ratios 11:1 or 13:1, kit price $249

TRX450R / CRF450R / CRF450X

Big Bore Kits for 2004-2005 (Stock bore 94mm)

• 470 kit*. Includes 2mm Oversize Piston kit (13:1 compression) and Gasket kit. *Note: Requires boring and replating of your stock cylinder.
• 500 kit*. Includes 4mm Oversize Piston kit (12:1 compression) and Gasket kit. *Note: Requires either replating or resleeving of your stock cylinder.

Big Bore Kits for 2006 (Stock bore 96mm)

• 468 kit*. Includes 2mm Oversize Piston kit (13:1 compression) and Gasket kit. *Note: Requires boring and replating of your stock cylinder.
• 487 kit*. Includes 4mm Oversize Piston kit (13:1 compression) and Gasket kit. *Note: Requires resleeving of your stock cylinder.