Yamaha YZ85 Specs

2005 - 2020 • 4 variants

The Yamaha YZ85 is a motocross bike produced from 2005 to 2020 across 4 variants. It is powered by a reed-valve-inducted displacing 84.70 cc.

About the Yamaha YZ85

Documented here are the full technical specifications for the Yamaha YZ85, a Cross / motocross motorcycle with a production run from 2002 to 2023. Specification data includes engine type and displacement, maximum power and torque output, transmission details, frame construction, suspension travel front and rear, brake types and rotor dimensions, tyre sizes, and overall weight and dimension figures. Select a year above to view the complete spec sheet for that model year.

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Yamaha YZ85 by Year

2020 Yamaha YZ85 View specs →

2019 Yamaha YZ85 View specs →

2017 Yamaha YZ85 View specs →

2005 Yamaha YZ85 View specs →

Spec Evolution

How key specs changed across production years.

Specification	2002	2004	2005	2006	2007	2008	2009	2010	2011	2012	2013	2014	2015	2016	2017	2018	2019	2020	2021	2022	2023
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
Displacement (cc)	84.70 cc	84.70 cc	85.00 cc ↑	84.70 cc ↓	84.70 cc	85.00 cc ↑	84.70 cc ↓	84.70 cc	85.00 cc ↑	85.00 cc	85.00 cc	85.00 cc	-	-	-	-	85.0 cc	85.0 cc	85.0 cc	85.0 cc	85.0 cc
Displacement (ci)	5.17 cubic inches	5.17 cubic inches	5.19 cubic inches ↑	5.17 cubic inches ↓	5.17 cubic inches	5.19 cubic inches ↑	5.17 cubic inches ↓	5.17 cubic inches	5.19 cubic inches ↑	5.19 cubic inches	5.19 cubic inches	5.19 cubic inches	-	-	-	-	5.19 cubic inches	5.19 cubic inches	5.19 cubic inches	5.19 cubic inches	5.19 cubic inches
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
Ground Clearance (in.)	13.8 inches	13.8 inches	-	13.8 inches	13.8 inches	13.8 inches	13.8 inches	13.8 inches	13.8 inches	13.8 inches	13.8 inches	13.8 inches	13.0 inches ↓	13.0 inches	13.0 inches	13.0 inches	13.0 inches	13.0 inches	13.0 inches	12.6 inches ↓	12.6 inches
Ground Clearance (mm)	351 mm	351 mm	-	351 mm	351 mm	351 mm	351 mm	351 mm	351 mm	351 mm	351 mm	351 mm	330 mm ↓	330 mm	330 mm	330 mm	330 mm	330 mm	330 mm	320 mm ↓	320 mm
Brakes - Rear Diameter (mm)	190 mm	146 mm ↓	190 mm ↑	146 mm ↓	146 mm	190 mm ↑	190 mm	190 mm	190 mm	190 mm	190 mm	190 mm	190 mm	190 mm	190 mm	190 mm	-	-	-	-	-
Brakes - Rear Diameter (in.)	7.5 inches	5.7 inches ↓	7.5 inches ↑	5.7 inches ↓	5.7 inches	7.5 inches ↑	7.5 inches	7.5 inches	7.5 inches	7.5 inches	7.5 inches	7.5 inches	7.5 inches	7.5 inches	7.5 inches	7.5 inches	-	-	-	-	-
Brakes - Front Diameter (mm)	220 mm	220 mm	220 mm	220 mm	198 mm ↓	220 mm ↑	220 mm	220 mm	220 mm	220 mm	220 mm	220 mm	220 mm	220 mm	220 mm	220 mm	-	-	-	-	-
Brakes - Front Diameter (in.)	8.7 inches	8.7 inches	8.7 inches	8.7 inches	7.8 inches ↓	8.7 inches ↑	8.7 inches	8.7 inches	8.7 inches	8.7 inches	8.7 inches	8.7 inches	8.7 inches	8.7 inches	8.7 inches	8.7 inches	-	-	-	-	-
Fuel Control	-	DOHC	-	-	-	-	-	-	Double Overhead Cams/Twin Cam (DOHC)	Double Overhead Cams/Twin Cam (DOHC)	Single Overhead Cams (SOHC)	-	-	-	-	-	-	-	-	-	-
Stroke	2	2	2	2	2	4 ↑	2 ↓	-	-	-	-	-	-	-	-	-	-	-	-	-	-
Frame Type	-	-	-	-	-	-	-	-	Aluminium	Single-backbone, semi-double-cradle frame	-	-	-	Single-backbone, semi-double-cradle frame	Single-backbone, semi-double-cradle frame	Semi-double-cradle frame	Semi-double-cradle frame	Semi-double-cradle frame	Semi-double-cradle frame	Semi-double-cradle	Semi-double-cradle
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.
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 ↓	-	-	-	-	-	-	-	-	-
Brakes - Front	Single disc	Single disc	Single disc	Single disc	Single disc	Single disc	Single disc	Single disc	Single disc. Wave	Single disc. Hydraulic	Single disc. Hydraulic disc.	Single disc. Hydraulic disc.	Single disc. Hydraulic.	Single disc. Hydraulic.	Single disc. Hydraulic.	Single disc. Hydraulic.	Single disc. Hydraulic.	Single disc. Hydraulic.	Single disc. Hydraulic.	Single disc. Hydraulic.	Single disc. Hydraulic.
Wheelbase	1,255 mm / 49.4 in.	1,255 mm / 49.4 in.	-	1,255 mm / 49.4 in.	1,257 mm / 49.5 in.	1,257 mm / 49.5 in.	1,257 mm / 49.5 in.	1,257 mm / 49.5 in.	1,257 mm / 49.5 in.	1,257 mm / 49.5 in.	1,257 mm / 49.5 in.	1,257 mm / 49.5 in.	1,257 mm / 49.5 in.	1,257 mm / 49.5 in.	1,257 mm / 49.5 in.	1,257 mm / 49.5 in.	1255 mm / 49.4 in. ↑	1255 mm / 49.4 in.	1255 mm / 49.4 in.	1255 mm / 49.4 in.	1255 mm / 49.4 in.
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
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
Brakes - Rear	Single disc	Single disc	Single disc	Single disc	Single disc	Single disc	Single disc	Single disc	Single disc. Wave	Single disc. Hydraulic	Single disc. Hydraulic disc.	Single disc. Hydraulic disc.	Single disc. Hydraulic.	Single disc. Hydraulic.	Single disc. Hydraulic.	Single disc. Hydraulic.	Single disc. Hydraulic.	Single disc. Hydraulic.	Single disc. Hydraulic.	Single disc. Hydraulic.	Single disc. Hydraulic.
Suspension - Front	-	Telescopic fork	Kayaba	Telescopic fork	Telescopic Fork, coil spring/oil damper, 10.8´	Inverted fork	Inverted fork	Inverted fork	Inverted fork	Inverted fork	Inverted fork	Inverted fork	Inverted fork	Inverted fork	Inverted fork	Inverted fork	Inverted fork	Inverted fork	Inverted fork	Inverted fork, fully adjustable	KYB Inverted fork, fully adjustable
Suspension - Rear	-	Swinging arm (monocross)	Kayaba	Swinging arm (monocross)	Swingarm (link, suspension), coil spring/gas-oil damper, 11.3´	Single shock	Single shock	Single shock	Single shock	Single shock	Single shock	Single shock	Single shock	Single shock	Single shock	Single shock	Single shock	Single shock	Single shock	Single shock, fully adjustable	KYB Single shock, fully adjustable
Fuel System	-	-	Carburettor	-	Carburettor. PWK28 x 1	-	Carburettor. Keihin® PWK 28	Carburettor. Keihin™ PWK 28 ↑	Carburettor. Keihin PWK 28 ↓	Carburettor. Keihin PWK 28	Carburettor. Keihin PWK 28	Carburettor. Keihin PWK 28	Carburettor. Keihin PWK 28	Carburettor. Keihin PWK 28	Carburettor. Keihin PWK 28	Carburettor. Keihin PWK 28	Carburettor. Keihin PWK 28	Carburettor. Keihin PWK 28	Carburettor. Keihin PWK 28	Carburettor. Keihin PWK 28	Carburettor. Hitachi Astemo® Keihin PWK28
Colours	-	Blue	Team Yamaha Blue/White	-	-	-	Blue/white	Team Yamaha Blue/White	Team Yamaha Blue/White	Blue/White	Team Yamaha Blue/White	Team Yamaha Blue/White	Team Yamaha Blue/White	Team Yamaha Blue/White	Blue/White	Team Yamaha Blue	Team Yamaha Blue	Team Yamaha Blue	Team Yamaha Blue	Team Yamaha Blue	Team Yamaha Blue
Clutch	-	-	-	-	-	-	Wet, multiplate	-	-	Drive Train	-	Multiplate	Multiplate	Wet multi-disc	Wet multi-disc	Wet multi-disc	Wet multi-disc	Wet multi-disc	Wet multi-disc	Wet multi-disc	Wet multi-disc
Final Drive	-	-	Chain	Chain	Chain	Chain	Chain	Chain	Chain	Chain	Chain	Chain	Chain	Chain	Chain	Chain	Chain (final drive)	Chain (final drive)	Chain (final drive)	Chain (final drive)	Chain (final drive)
Height	1,161 mm / 45.7 in.	1,161 mm / 45.7 in.	-	1,161 mm / 45.7 in.	1,161 mm / 45.7 in.	1,161 mm / 45.7 in.	1,161 mm / 45.7 in.	1,161 mm / 45.7 in.	1,161 mm / 45.7 in.	1,161 mm / 45.7 in.	1,161 mm / 45.7 in.	1,161 mm / 45.7 in.	1,125 mm / 44.3 in. ↓	1,125 mm / 44.3 in.	1,125 mm / 44.3 in.	1,125 mm / 44.3 in.	1146 mm / 45.1 in. ↑	1146 mm / 45.1 in.	1146 mm / 45.1 in.	1135 mm / 44.7 in. ↓	1135 mm / 44.7 in.
Rims	-	-	-	-	-	-	-	-	-	-	-	-	-	-	-	Dunlop tyres	Dunlop tyres	Dunlop tyres	Dunlop® MX3S® tyres	Dunlop® Geomax tyres	Dunlop® Geomax MX3S tyres
Length	1,818 mm / 71.6 in.	1,818 mm / 71.6 in.	-	1,818 mm / 71.6 in.	1,821 mm / 71.7 in.	1,821 mm / 71.7 in.	1,821 mm / 71.7 in.	1,821 mm / 71.7 in.	1,821 mm / 71.7 in.	1,821 mm / 71.7 in.	1,821 mm / 71.7 in.	1,821 mm / 71.7 in.	1,821 mm / 71.7 in.	1,821 mm / 71.7 in.	1,821 mm / 71.7 in.	1,821 mm / 71.7 in.	1821 mm / 71.7 in. ↑	1821 mm / 71.7 in.	1821 mm / 71.7 in.	1821 mm / 71.7 in.	1821 mm / 71.7 in.
Warranty	-	-	-	-	-	-	-	-	30 Day (Limited Factory Warranty)	30 Days Limited Factory Warranty)	30 Day (Limited Factory Warranty)	30 Day (Limited Factory Warranty)	30 Day Limited Factory Warranty	30 Day Limited Factory Warranty	30 Day Limited Factory Warranty	30 Day Limited Factory Warranty	30 Day Limited Factory Warranty	30 Day Limited Factory Warranty	30 Day Limited Factory Warranty	30 Day Limited Factory Warranty	30 Day Limited Factory Warranty
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
Compression Ratio	8.2:1	8.2:1	-	8.2:1	8.2:1	8.2:1	8.2:1	8.2:1	8.2:1	8.2:1	8.2:1	8.2:1	8.2:1	8.2:1	8.2:1	8.2:1	8.2:1	9.6:1 ↑	9.6:1	9.6:1	9.6:1
Tyres - Front	70/100-17 40M	70/100-17	-	70/100-17	70/80-M17	70/80-M17	70/80-M17	70/100-M17	70/100-M17	70/100-17	21/7-10 ↓	100/80-10 ↑	70/100-17 ↓	70/100-17	70/100-17	70/100-17	70/100-17	70/100-17	70/100-17	70/100-17	70/100-17
Engine Lubrication	-	-	-	-	-	-	-	-	Dry sump	Wet sump	-	-	-	-	-	-	-	-	-	-	-
Width	758 mm / 29.8 in.	758 mm / 29.8 in.	-	758 mm / 29.8 in.	757 mm / 29.8 in. ↓	785 mm / 30.9 in. ↑	785 mm / 30.9 in.	785 mm / 30.9 in.	757 mm / 29.8 in. ↓	757 mm / 29.8 in.	757 mm / 29.8 in.	757 mm / 29.8 in.	759 mm / 29.9 in. ↑	759 mm / 29.9 in.	759 mm / 29.9 in.	759 mm / 29.9 in.	759 mm / 29.9 in.	759 mm / 29.9 in.	759 mm / 29.9 in.	759 mm / 29.9 in.	759 mm / 29.9 in.
Gearbox	-	-	5-speed	-	6-speed	6-speed	6-speed	6-speed	6-speed	6-speed	6-speed	6-speed	6-speed	6-speed	6-speed	6-speed	6-speed	6-speed	6-speed	6-speed	6-speed
Tyres - Rear	90/100-14 49M	90/100-14	-	90/100-14	90/90-M14	90/90-M14	90/90-M14	90/90-M14	90/100-M14	90/100-14	20/10-9 ↓	130/60-13 ↑	90/100-14 ↓	90/100-14	90/100-14	90/100-14	-	-	-	-	-
Rake	-	-	-	-	-	26.0°	-	-	-	-	28.0°	28.0°	28.0°	28.0°	28.0°	28.0°	28.0°	26.3° ↓	26.3°	26.3°	26.3°
Lighting system	-	-	-	-	-	-	-	-	Dual 30W Krypton multireflector Headlights and 3.9/0.5W LED Brake light	Dual 30W Krypton multireflector Headlights and 3.9/0.5W LED Brake light	-	LED lights	-	-	-	-	-	-	-	-	-
Seat	-	-	-	-	-	-	-	-	-	-	2-person seat	2 people seat	-	-	-	-	-	-	-	-	-
Wheel Travel - Front	275 mm / 10.8 in.	275 mm / 10.8 in.	-	-	-	274 mm / 10.8 in.	274 mm / 10.8 in.	274 mm / 10.8 in.	274 mm / 10.8 in.	274 mm / 10.8 in.	274 mm / 10.8 in.	274 mm / 10.8 in.	274 mm / 10.8 in.	274 mm / 10.8 in.	274 mm / 10.8 in.	274 mm / 10.8 in.	274 mm / 10.8 in.	274 mm / 10.8 in.	274 mm / 10.8 in.	274 mm / 10.8 in.	274 mm / 10.8 in.
Ignition	-	-	-	-	CDI	CDI	-	CDI	CDI	CDI	CDI	Digital CDI	CDI	CDI	CDI	CDI	CDI	CDI	CDI	CDI	CDI
Power-to-Weight Ratio	-	-	-	-	-	-	-	-	-	-	0.1143 HP/kg	0.1819 HP/kg ↑	-	-	-	-	-	-	-	-	-

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