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Rear Tire Motocross

Look at this page for Rear Tire Motocross information

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Things to bring to a motocross race?

Im going to be racing motocross and i need some advice in what i need as in extra parts or whatever. so far these are the things i have

Crf250r
1 jersey
1 pair of gloves
1 motocross pant
Tire changer
extra front and rear sprocket
extra chain
Oil
3 air filters
Filter oil
grip glue
Knee guards
Neck brace
Chest protector

I also have the parts already on the bike like
Suspension
Both unbreakable sunline levers
Protaper foot pegs
New chain
New front and rear sprocket
Pro taper SE handlebars
Geomax mx51 front and rear tires (Im also thinking about getting the rear MX31 and mx71 incase of different track conditions, also need your advice on that.)
and 1 pair of goggles with 50 extra tearoffs
1 helmet
Im going to be in nevada, utah, and california
Oh ya of course plenty of gas

You may want to get an extra pair of gloves and goggles even if you do have 50 tear offs. Bring food and stuff to drink along with some lawn chairs and something to provide shade.

As for the tires, check the weather the day before. Unless you have an extra set of rims you don't want to be changing tires on race day unless you absolutely have to. Too many things can go wrong if you try to change a tire before a race. It's better to race with a tire that doesn't match track conditions then be cussing in the pits because you just put a hole in your second tube.

I see that you failed to list gas. Gas is usually a good thing to bring to a race.

Other than that you are pretty much set. Try Carb loading before a big race, it really helps! http://en.wikipedia.org/wiki/Carbohydrate_loading

Oh, you may also want to bring a helmet.

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You may also find some more Rear Tire Motocross information at Amazon below.
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Honda XR series

Small XR models

The bikes that fall under this category are physically smaller than any of the other bikes in the series. They are predominantly designed for children, or as pit bikes, for recreational fun, nothing more. For an adult rider, they would not be comfortable for a ride of any length.

XR 50R

The XR 50 is a small 4-stroke 50cc child's entry level motorcycle. produced from 1968 until today originally called the Trail 50, then Z-50, the XR 50, CRF 50, and now a street legal (mini motard) version called the XR 50. This model is currently not sold in the United States due to the CPSIA.

XR 70R

Engine:

Engine: 72cc, air cooled, single cylinder, four stroke, SOHC, two-valve

Displacement: 72cc. Bore x Stroke: 47mm X 41.4mm. Compression Ratio: 9.0:1

Carburetion: 13mm piston-valve. Ignition: CDI.

Dimensions:

Weight: 125.7 lbs. Ground Clearance: 6.5 in. Wheelbase: 41.5 in.

Fuel Capacity: 1.6 gal., including 0.2 gal. Reserve

Seat Height: 25.5 in.

Drive Train:

Transmission: 3-speed with automatic clutch. Final Drive: #420 chain

Suspension:

Front: 27mm Telescopic fork, 3.9" of travel

Rear: Single shock, 3.7" of travel

Brakes/Wheels/Tires:

Brakes: Front: Drum. Rear: Drum

Tires: Front: 2.50 X 14. Rear: 3.00 X 12

XR 75R

Engine:

Engine: 75cc, air cooled, single cylinder, four stroke, SOHC, two valve

Displacement: 75cc

Carburetion: 20mm Keihin

Dimensions:

Weight: Approx 140 pounds. Ground Clearance:: Information unavailable Wheelbase:: Information Unavailable

Fuel Capacity: 1.6 gal

Seat Height:: Information Unavailable

Drive Train:

Transmission: 5 speed Manual clutch. Final Drive: Information unavailable

Suspension: Information Unavailable

Brakes/Wheels/Tires:

Brakes: Front: Drum. Rear: Drum.

Tires: Information Unavailable

XR 80R

Engine:

Engine: 79cc, air cooled, single cylinder, four stroke, SOHC, two-valve

Displacement: 80cc. Bore x Stroke: 47.5mm X 45mm. Compression Ratio: 9.7:1

Carburetion: 18mm piston-valve. Ignition: CDI.

Dimensions:

Weight: 141.1 lbs. Ground Clearance: 8.3 in. Wheelbase: 47.0 in.

Fuel Capacity: 1.6 gal., including 0.2 gal. Reserve

Seat Height: 28.5 in.

Drive Train:

Transmission: 5-speed. Final Drive: #420 chain, 14T/46T

Suspension:

Front: 27mm leading axle Showa fork, 5.0" of travel

Rear: Pro-Link single shock, 4.3" of travel

Brakes/Wheels/Tires:

Brakes: Front: Drum. Rear: Drum

Tires: Front: 2.50 X 16. Rear: 3.60 X 14

XR 100R

Engine:

Engine: 99cc, air cooled, single cylinder, four stroke, SOHC, two-valve

Displacement: 99cc. Bore x Stroke: 53mm X 45mm. Compression Ratio: 9.4:1

Carburetion: 20mm piston-valve. Ignition: CDI.

Dimensions:

Weight: 149.9 lbs. Ground Clearance: 10.4 in. Wheelbase: 49.4 in.

Fuel Capacity: 1.6 gal., including 0.2 gal. Reserve

Seat Height: 30.3 in.

Drive Train:

Transmission: 5-speed. Final Drive: #428 chain, 14T/50T

Suspension:

Front: 27mm leading axle Showa fork, 5.0" of travel

Rear: Pro-Link single shock with spring pre-load adj., 4.7" of travel

Brakes/Wheels/Tires:

Brakes: Front: Drum. Rear: Drum

Tires: Front: 2.50-19. Rear: 3.00-16

XR 125L

A popular learner bike for many due to its highly forgiving handling, long-travel suspension for absorbing otherwise dangerous bumps, excellent fuel consumption (80-90mpg) and highly reliable four-stroke 124cc engine. While not a particularly powerful 125cc bike, generating 11.13 HP (8.1 kW) at 8500 RPM, and a top speed of around 65mph, the engine is generally regarded as being, with adequate maintenance, all but bullet-proof when it comes to reliability. The XR 125L doesn't feature a kick start, but its dependable electric start and ease with which this bike can be bump-started negates the need for one.

Tires on this bike are generally dual-sport as standard, being grippy enough for road riding, but having a deeper tread than usual to allow for a little off-road riding without submitting to the on-road handling problems associated with full off-road knobbly tires.

XR 200R

1993 Honda XR 200R

General information

Model: Honda XR 200R

Year: 2002

Engine and Transmission

Displacement: 195.00 ccm (11.90 cubic inches)

Engine type: Single cylinder

Stroke: 4

Compression: 10.0:1

Bore x Stroke: 65.5 x 57.8 mm (2.6 x 2.3 inches)

Valves Per Cylinder: 2

Fuel Control: SOHC

Cooling system: Air

Gearbox: 6-speed

Transmission Type

Final Drive: Chain

Physical Measures

Dry Weight: 101.0 kg (222.7 pounds)

Seat Height: 851 mm (33.5 inches) If adjustable, lowest setting.

Ground Clearance: 277 mm (10.9 inches)

Wheelbase: 1,359 mm (53.5 inches)

Chassis and Dimensions

Front Suspension Travel: 208 mm (8.2 inches)

Rear Suspension Travel: 211 mm (8.3 inches)

Front Tire Dimensions: 80/100-21

Rear Tire Dimensions: 100/100-17

Front Brakes: Expanding brake

Rear Brakes: Expanding brake

Other Specifications

Fuel Capacity: 10.90 liters (2.88 gallons)

Reserve Fuel Capacity: 1.80 liters (0.48 gallons)

XR 250R

For many years, the XR 250R was the standard small-bore off-road four stroke. It had a 249 cc air-cooled motor with Honda's famous Radial Four Valve Combustion Chamber (RFVC). In 1996, the bike was entirely updated. The updated engine put out a usable 19 hp (14 kW) at 8100 rpm. Though the bike was new, it kept the antiquated air-cooling and conventional suspension fork. The XR 250R was the king of entry level off road four strokes. It was simple, indestructible, and reliable. Modified XR 250's were even raced in the GNCC's by Scott Summers. This bike was discontinued in 2004, replaced by the more modern CRF 250X.

XR 250L

This is the road legal version of the xr250r. the primary differences being on road lighting (head, tail, brake, and turn indicators). It also received D.O.T. (road legal) tires, metal fuel tank, key ignition/ steering lock, and many other small changes to make it more suitable for road use, this usually at the expense of off road ability, and added weight, about 40 lbs. It also used a different carburetor and the exhaust headers were 3mm smaller than the R's to meet emissions requirements. It had a 249 cc air-cooled motor with Honda's famous Radial Four Valve Combustion Chamber (RFVC). In 1996, the bike entire was updated. The updated engine put out a usable 19 hp (14 kW) at 8100 rpm. Though the bike was new, it kept the antiquated air-cooling and conventional suspension fork. This bike was discontinued in 2004.

XR 350R

Introduced in 1983, Sold from 1983-1985

Specs

Model: Honda XR 350R

Engine:

Cooling: Air-cooling

Stoke: 4

Cylinder: Single cylinder DOHC, 4 valve

Capacity: 339ml. Bore x Stroke 84 x 61.3 mm.

Compression Ratio: 9.5;1

Induction: 2x 26mm Keihin

Ignition/Starting: CDI/electric

Max Power: 22.4 hp @ 7500 rpm.

Max Torque: 19ftlbs

Transmission/Drive: 6 Speed/chain

Suspension:

Front Suspension: 41mm Air adjustable forks, 280mm wheel travel.

Rear Suspension: Single gas shocks, fully adjustable , 290mm wheel travel.

Brakes/Wheels/Tires: Front Brakes: Single Disc

Rear Brakes: Drum

Front Tire: 90/90 -21

Rear Tire: 130/80 -17

Dimensions:

Dry-Weight: 121 kg

Fuel Capacity: 9 Liters

Specs from 1984'

XR 400R

Introduced in 1996, the XR 400R was wildly popular. It was reasonably light (264 pounds) and made a pleasant 32 hp (24 kW) at 7600 rpm. It shared a frame, plastic and suspension components with the XR 250R, and had a similar air-cooled engine with RFVC technology. XR 400's were heavily modified and raced. In 1998, however, Yamaha eclipsed the XR 400R with its answer to the mid-size off-road four stroke: the WR 400F. The WRF was much more advanced in technology than the XR. In 2006, Honda replaced the XR 400 with the CRF 450X.

Specs

Engine: Air-cooled dry-sump single-cylinder four-stroke, SOHC; four-valve RFVC

Displacement: 397cc. Bore x Stroke:: 85.0mm x 70.0mm

Compression Ratio: 9.3:1.

Fuel System: 36mm piston-valve

Ignition: Solid-state CD with electronic advance

Dimensions:

Weight: 257.0 lbs. Ground Clearance: 12.2 in. Wheelbase: 56.1 in.

Fuel Capacity: 2.5 gal. (including 0.4-gallon reserve) Seat Height: 36.6 in.

Drive Train:

Transmission: Five-speed. Final Drive: #520 O-ring-sealed chain; 15T/45T

Suspension:

Front: 43mm leading-axle Showa cartridge fork w/18-position compression and 12-position rebound-damping adj.; 11.0-in. travel

Rear: Pro-Link Showa single-shock with spring-preload, 16-position comp. and 16-

position rebound-damping adj.; 11.8-in. travel

Brakes/Wheels/Tires:

Brakes: Front: Single disc with twin-piston caliper. Rear: Single disc

Tires: Front: 80/100-21. Rear: 110/100-18

XR 500R

Early twin shock model. Followed by a monoshock four valve XR 500. In 1983 motor was upgraded to RFVC technology with full cradle frame to suit. This won the Baja race and was quickly revised to 600 cc (see XR 600R). -Produced from 1979 through 1985

Specs

Engine and Transmission:

Displacement: 500.00 ccm (30.51 cubic inches)

Engine type: Single cylinder. Stroke: 4

Power: 37.00 HP (27.5 kW))

Fuel system: Carburetor (dual)

Fuel control: OHC

Starter: Kick

Cooling system: Air

Chassis and dimensions: Frame type: Steel

Top speed: 150.0 km/h (100.7 mph)

weight 238.33 lbs

XR 600R

A 1993 Honda XR600R

The XR 600R was king of the Baja races. It was introduced in 1985, and was updated again in 1992. The XR won many desert races at the hands of Johnny Campbell and Scott Summers. Its air cooled engine was very similar to the XR 400 and XR 250 engines, with the same RFVC valve train. The XR 600 only made 38 hp (28 kW) at its peak (Kerker Dyno Dirt Rider Magazine Aug/1985, Kerker Dynos notoriously gave much lower HP readings than most other dyno's), but its torque was impressive @ 32 FT LBS. In 2000, Honda replaced this desert warrior with the XR 650R.

Early versions had a twin carburetor setup 85-87 later model (88 onwards) were designed to run on a single carburetor and coupled with a completely different bodywork styling took the XR to the next level. 85 and early 86 models were believed to suffer from 3rd gear problems when exposed to heavy use, this was addressed in later 86 and all 87 models. The late 86 model is regarded as the best to own from all the XR 600R models, it has the best color scheme, the best styling, 88 onwards were plain in comparison and lost the rugged appeal attained by its predecessor. The XR 600R make excellent super motocross conversions although difficult to achieve on the 85-86 due to the rear drum brake setup, this would require a bespoke back wheel to be fabricated as they are not commercially available for these models.

XR 650R

The XR 650R was not just an update to the XR 600--it was a totally new bike. An all-new 649cc, liquid cooled, SOHC engine was mated to an aluminum box frame. The large XR did carry substantial girth, however, at 280 pounds dry.

The XR 650R is an incredible desert racer. It has won every professional desert race its entered It remains one of the few stock dirt bikes that can touch 100 mph (160 km/h). The stock Australian geared bike can reach 180 km/h.

2003 XR 650R Manufacturer Specs

Engine:

Engine Type 649cc liquid-cooled dry-sump single-cylinder four-stroke

Bore and Stroke 100.0mm x 82.6mm

Compression Ratio 10.0:1

Carburetion: Keihin 40mm piston-valve

Ignition: Solid-state CD with electronic advance

Drive Train:

Transmission Five-speed

Final Drive: #520 O-ring-sealed endless chain; 14T/48T

Suspension:

Front Suspension: 46mm leading-axle Kayaba cartridge fork with compression- and rebound-damping adjustability; 11.2-inch travel

Rear Suspension: Pro-Link Kayaba single-shock with spring-preload, compression- and rebound-damping adjustability; 12.1-inch travel

Dimensions:

Rake: 27.8 degrees

Trail: 111.0mm (4.3 inches)

Wheelbase: 58.3 inches

Seat Height: 36.8 inches

Ground Clearance: 12.0 inches

Dry Weight: 277.0 pounds

Fuel Capacity: 2.6 gallons, including 0.5 gallon reserve

Brakes/Wheels/Tires:

Front Brake: Single 240mm disc with twin-piston caliper

Rear Brake: Single 240mm disc with single-piston caliper

Front Tire: 80/100-21

Rear Tire: 110/100-18

XR 650L

XR 650L

The XR 650L is a street/trail bike that is more similar to the XR 600R than the XR 650R. It has a steel tube frame as opposed to an aluminum spar frame like in the XR 650R. It also has an air-cooled 644 cc SOHC dry-sump single cylinder 4-stroke engine similar except for an increased displacement to the XR 600R, unlike the totally redesigned XR 650R that has a liquid-cooled 649cc SOHC dry-sump single cylinder 4-stroke engine. With a headlight, taillight, turn signals, mirrors, smog system, revised exhaust system and a 2.8 gallon gas tank with 0.6 gal reserve, the 650 L is a hefty 324 lb (dry weight).

See also

Honda CRF series

Yamaha WRF series

References

^ Honda Off-Road Motorcycles - Review, Performance, Specs

^ Honda Motorcycles Models

^ http://www.motorcycle.com/mo/mcdirt/mcphotos/xr11.gif

^ a b 2004 XR 250 vs DR-Z 250 vs KLX 300R - MotorcycleUSA.com

^ Honda XR 650R: The King of Baja

^ "Race Test: Honda XR650R." Dirt Bike Magazine. February, 2000. p. 40.

^ Honda XR 650R: The biggest, baddest dirt bike on the planet

External links

Honda's off-road motorbikes

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