MotoSpecs

2020 Yamaha YZ85 Specifications

Cross / motocross

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2020 Yamaha YZ85 Overview

The 2020 Yamaha YZ85 is a cross / motocross motorcycle built around 85 cc of displacement. Under the tank sits a Single cylinder, two-stroke engine, a compression ratio of 9.6:1. The bore and stroke measures 47.5 x 47.8 mm. From a practical standpoint, the 2020 YZ85 tips the scales at 73 kg, carries a 4.92-litre fuel tank, offers a seat height of 841 mm and spans a 1255 mm wheelbase. Scroll down for the complete 2020 Yamaha YZ85 spec sheet covering every technical detail from suspension travel to tyre sizes.

2020 YZ85 - Pros & Cons

Strengths

  • Factory engineering: The 2020 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.
  • Tall seat height: The 841 mm seat height will challenge shorter riders - tiptoeing at low speeds is something to factor into your decision.

Owner Experiences & Common Issues

Carburetor maintenance

Carburetors on the 2020 Yamaha YZ85 benefit from a clean and re-jet if the bike has been stored, run on stale fuel, or modified with an aftermarket exhaust. Owners frequently mention that fresh jets and float needle clips transforms throttle response from flat to crisp.

YZ85 - Buying & Maintenance Guide

What to check before buying

When inspecting a used 2020 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.

2020 Yamaha YZ85 - Frequently Asked Questions

What engine does the 2020 Yamaha YZ85 have?
The 2020 Yamaha YZ85 uses a Single cylinder, two-stroke engine with 85 cc of displacement.
How much does the 2020 Yamaha YZ85 weigh?
The 2020 Yamaha YZ85 weighs 73 kg. This is the manufacturer's wet figure.
What is the fuel tank capacity of the 2020 Yamaha YZ85?
The 2020 Yamaha YZ85 has a 4.92-litre fuel tank.
Is the 2020 Yamaha YZ85 suitable for shorter riders?
The 2020 Yamaha YZ85 has a seat height of 841 mm. This is towards the tall end of the spectrum and will require most riders under 175 cm to tiptoe at stops.
What brakes does the 2020 Yamaha YZ85 have?
The 2020 Yamaha YZ85 uses Single disc. Hydraulic. at the front and Single disc. Hydraulic. at the rear.
What tyre sizes does the 2020 Yamaha YZ85 use?
The front tyre size on the 2020 Yamaha YZ85 is 70/100-17.
What fuel system does the 2020 Yamaha YZ85 use?
The 2020 Yamaha YZ85 uses Carburettor. Keihin PWK 28, providing precise fuelling across the rev range and reliable cold-start behaviour.

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, two-stroke

Power

N/A

Torque

N/A

Top Speed

N/A

Weight

73.0 kg / 161.0 lbs

Fuel Capacity

4.92 litres / 1.30 US gallons

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Full 2020 Yamaha YZ85 Specifications

Colours Team Yamaha Blue
Warranty 30 Day Limited Factory Warranty
Bore x Stroke (in,) 1.9 x 1.9 inches
Bore x Stroke (mm) 47.5 x 47.8 mm
Displacement (cc) 85.0 cc
Displacement (ci) 5.19 cubic inches
Engine Type Single cylinder, two-stroke
Engine Detail Reed-valve-inducted
Fuel System Carburettor. Keihin PWK 28
Compression Ratio 9.6:1
Ignition CDI
Starter Electric
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Yamaha YZ85 - other years

2020 2019 2017 2005
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