MotoSpecs

2005 Yamaha YZ85 Specifications

Cross / motocross • Specs last verified 13 July 2026

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2005 Yamaha YZ85 Overview

The 2005 Yamaha YZ85 is a cross / motocross motorcycle built around 85 cc of displacement. Under the tank sits a Single cylinder engine. The bore and stroke measures 54 x 0 mm. Scroll down for the complete 2005 Yamaha YZ85 spec sheet covering every technical detail from suspension travel to tyre sizes.

2005 YZ85 - Pros & Cons

Strengths

  • Factory engineering: The 2005 Yamaha YZ85 represents Yamaha's engineering at the time, with a specification built around real-world usability.

Considerations

  • Carburetor fuelling: Carbureted engines need occasional jetting attention and can be reluctant in cold weather or at altitude compared to modern fuel-injected alternatives.
  • Chain final drive upkeep: Chain final drive needs regular cleaning, lubrication and tension checks to get full life out of the sprockets.

Wear Points & Servicing Notes

Carburetor maintenance

The YZ85 uses carburetion rather than fuel injection, which means jetting is altitude- and temperature-sensitive and benefits from a clean-and-rejet after extended storage or an exhaust change.

Brake disc and pad wear

The Single disc front brake gives strong, progressive stopping power. Disc thickness and pad depth are worth checking at every tyre change, since worn pads can score the disc surface.

Suspension condition on used examples

Up front, the YZ85 runs Kayaba and Kayaba at the rear. On a used example, check fork seals for weeping oil and test the rear linkage for play - seals are a relatively cheap fix but useful when negotiating price.

Final drive maintenance

Final drive is by chain - expect to clean and lube it every few hundred kilometres and check tension regularly; a neglected chain wears the sprockets faster than the chain itself.

YZ85 - Buying & Maintenance Guide

What to check before buying

When inspecting a used 2005 Yamaha YZ85, start with the basics: check the service book for oil change frequency, inspect the chain and sprockets for wear, and look for oil seepage around the engine casings and rocker covers. A cold start test is invaluable - a well-maintained YZ85 should fire up cleanly and settle to a smooth idle within a few seconds.

Oil and filter changes

Regular oil changes are the single most important maintenance task on any YZ85. Stick to the manufacturer's interval - typically every 6,000 km or once a year, whichever comes first. Always use the correct viscosity grade as specified in the owner's manual.

Carburetor upkeep

Keep the carburetors clean and free of deposits. If the YZ85 has been stored, strip and clean the carb float bowls before attempting to start it. Pilot jets are the first to block and the last to be checked - always include them in any carb rebuild.

2005 Yamaha YZ85 - Frequently Asked Questions

What engine does the 2005 Yamaha YZ85 have?
The 2005 Yamaha YZ85 uses a Single cylinder engine with 85 cc of displacement.
How much does the 2005 Yamaha YZ85 weigh?
The 2005 Yamaha YZ85 weight is listed in the full spec table below.
What brakes does the 2005 Yamaha YZ85 have?
The 2005 Yamaha YZ85 uses Single disc at the front and Single disc at the rear.
What fuel system does the 2005 Yamaha YZ85 use?
The 2005 Yamaha YZ85 uses Carburettor, providing precise fuelling across the rev range and reliable cold-start behaviour.
What suspension does the 2005 Yamaha YZ85 have?
The 2005 Yamaha YZ85 uses Kayaba up front and Kayaba at the rear.

Yamaha YZ85 Spec Evolution

The Yamaha YZ85 was produced across 21 model years (2002-2023). The table below highlights the key specifications that changed across the production run - useful whether you are comparing years or tracking down a specific variant.

Specification 2002 2004 2005 2006 2007 2008 2009 2010 2011 2012 2013 2014 2015 2016 2017 2018 2019 2020 2021 2022 2023
Wet Weight - - - - - - 70.8 kg / 156.0 lbs 70.8 kg / 156.0 lbs 70.8 kg / 156.0 lbs 71.2 kg / 157.0 lbs 71.2 kg / 157.0 lbs 71.2 kg / 157.0 lbs 71.2 kg / 157.0 lbs 71.2 kg / 157.0 lbs 71.2 kg / 157.0 lbs 71.2 kg / 157.0 lbs 73.0 kg / 161.0 lbs 73.0 kg / 161.0 lbs 73.0 kg / 161.0 lbs 73.0 kg / 161.0 lbs 73.0 kg / 161.0 lbs
Dry Weight 66 kg / 145.5 lbs 66 kg / 145.5 lbs - 66 kg / 145.5 lbs 66.2 kg / 146.0 lbs 66.2 kg / 146.0 lbs - - - - 210.5 kg / 464.1 lbs 59 kg / 130.1 lbs - - - - - - - - -
Engine Detail - - - - - - - - - Reed-valve inducted Reed-valve-inducted Reed-valve-inducted Reed-valve-inducted Reed-valve-inducted Reed-valve-inducted Reed-valve-inducted Reed-valve-inducted Reed-valve-inducted Reed-valve-inducted Reed-valve-inducted Reed-valve-inducted
Engine Type Single cylinder Single cylinder Single cylinder Single cylinder Single cylinder Single cylinder Single cylinder Single cylinder, two-stroke Single cylinder, two-stroke Single cylinder, two-stroke Single cylinder, two-stroke Single cylinder, two-stroke Single cylinder, two-stroke Single cylinder, two-stroke Single cylinder, two-stroke Single cylinder, two-stroke Single cylinder, two-stroke Single cylinder, two-stroke Single cylinder, two-stroke Single cylinder, two-stroke Single cylinder, two-stroke
Seat Height 864 mm / 34.0 in. 864 mm / 34.0 in. - 864 mm / 34.0 in. 864 mm / 34.0 in. 864 mm / 34.0 in. 864 mm / 34.0 in. 864 mm / 34.0 in. 864 mm / 34.0 in. 864 mm / 34.0 in. 864 mm / 34.0 in. 864 mm / 34.0 in. 841 mm / 33.1 in. 841 mm / 33.1 in. 841 mm / 33.1 in. 841 mm / 33.1 in. 841 mm / 33.1 in. 841 mm / 33.1 in. 841 mm / 33.1 in. 841 mm / 33.1 in. 841 mm / 33.1 in.
Fuel Capacity - - - - 4.92 litres / 1.30 gallons 4.92 litres / 1.30 gallons 4.92 litres / 1.30 gallons 4.92 litres / 1.30 gallons 4.92 litres / 1.30 gallons 4.92 litres / 1.30 gallons 4.92 litres / 1.30 gallons 4.92 litres / 1.30 gallons 4.92 litres / 1.30 gallons 4.92 litres / 1.30 gallons 4.92 litres / 1.30 gallons 4.92 litres / 1.30 gallons 4.92 litres / 1.30 US gallons 4.92 litres / 1.30 US gallons 4.92 litres / 1.30 US gallons 4.92 litres / 1.30 US gallons 4.92 litres / 1.30 US gallons
Bore x Stroke (in,) 1.9 x 1.9 inches 1.9 x 1.9 inches 2.1 x inches 1.9 x 1.9 inches 1.9 x 1.9 inches 1.9 x 1.9 inches 1.9 x 1.9 inches 1.9 x 1.9 inches 1.9 x 1.9 inches 1.9 x 1.9 inches 1.9 x 1.9 inches 1.9 x 1.9 inches 1.9 x 1.9 inches 1.9 x 1.9 inches 1.9 x 1.9 inches 1.9 x 1.9 inches 1.9 x 1.9 inches 1.9 x 1.9 inches 1.9 x 1.9 inches 1.9 x 1.9 inches 1.9 x 1.9 inches
Bore x Stroke (mm) 47.5 x 47.8 mm 47.5 x 47.8 mm 54.0 x 0.0 mm 47.5 x 47.8 mm 47.5 x 47.8 mm 47.5 x 47.8 mm 47.5 x 47.8 mm 47.5 x 47.8 mm 47.5 x 47.8 mm 47.5 x 47.8 mm 47.5 x 47.8 mm 47.5 x 47.8 mm 47.5 x 47.8 mm 47.5 x 47.8 mm 47.5 x 47.8 mm 47.5 x 47.8 mm 47.5 x 47.8 mm 47.5 x 47.8 mm 47.5 x 47.8 mm 47.5 x 47.8 mm 47.5 x 47.8 mm

Key Specifications

Engine

Single cylinder

Power

Not published by manufacturer

Torque

Not published by manufacturer

Top Speed

Not published by manufacturer

Weight

Not published by manufacturer

Fuel Capacity

Not published by manufacturer

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Full 2005 Yamaha YZ85 Specifications

Colours Team Yamaha Blue/White
Bore x Stroke (in,) 2.1 x inches
Bore x Stroke (mm) 54.0 x 0.0 mm
Displacement (cc) 85.00 cc
Displacement (ci) 5.19 cubic inches
Engine Type Single cylinder
Stroke 2
Fuel System Carburettor
Final Drive Chain
Gearbox 5-speed
Suspension - Front Kayaba
Suspension - Rear Kayaba
Brakes - Front Diameter (in.) 8.7 inches
Brakes - Front Diameter (mm) 220 mm
Brakes - Rear Diameter (in.) 7.5 inches
Brakes - Rear Diameter (mm) 190 mm
Brakes - Front Single disc
Brakes - Rear Single disc

Specifications are compiled from manufacturer documentation and cross-referenced technical sources, and corrected on an ongoing basis. Spot an error? Let us know.

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