June 21, 1983, Press Release, Honda to release two new 80cc sports bikes with water-cooled, two-stroke engines: the Honda MBX80 Integra and the Honda MTX80R

Honda Motor Co., Ltd. will simultaneously release two new models on June 22nd: the Honda MBX80 Integra, a road sports bike equipped with a full fairing and a water-cooled, two-stroke, 79cc single-cylinder engine, and the Honda MTX80R, a lightweight land sports bike.

The engine installed in the MBX80 Integra uses a hemispherical combustion chamber with excellent combustion efficiency. Furthermore, it has a four-lobe reed valve with a baffle plate for smooth intake and a large exhaust chamber, resulting in a high output of 12 PS/9,000 rpm. 

It also has a well-established Pro-Link rear suspension that provides excellent road surface tracking, hydraulic disc brakes with dual piston calipers that provide high stopping power, and a full fairing that protects the rider from wind pressure while riding, making it a road sports bike with a full range of equipment suitable for the road.

The engine of the MTX80R uses the same hemispherical combustion chamber and four-lobe reed valve with a baffle plate as the MBX80 Integra. It has a high output of 11 PS/8,500 rpm and a tenacious torque performance at low and mid-speed ranges that matches the usability of a land sports bike.

In addition, the Pro-Link rear suspension provides excellent road-holding performance even on rough terrain, while the front suspension has a built-in fork mechanism and a long stroke of 200 mm. In addition, the slim body makes it easy to reach the ground, allowing you to enjoy a comfortable ride from rough terrain to urban areas.

The sales plan is

MBX80 Integra 3,000 units

, MTX80R 3,000 units (domestic, annual)

The national standard cash price is

MBX80 Integra is 228,000 yen

and MTX80R is 198,000 yen.

(Prices for Hokkaido and Okinawa are 3,000 yen higher. Other areas and some remote islands are excluded.)

Main specifications

		MBX80 Integra	MTX80R
Model		HC04	HD08
Total length (m)		1.980	2.095
Overall width(m)		0.685	0.805
Total height (m)		1.125	1.130
Wheelbase(m)		1.265	1.345
Minimum ground clearance(m)		0.160	0.230
Seat height(m)		0.780	0.845
Vehicle weight (kg)		104	100
Dry weight (kg)		92	89.5
Passenger capacity (persons)		2	2
Fuel economy (km/L)		60.0 (50km/h constant speed test value)	58.0 (50km/h constant speed test value)
Climbing ability (tanθ)		0.43 (approx. 23 degrees)	0.42 (approx. 22.8 degrees)
Minimum turning radius (m)		2.0	2.0
Engine type		HC04E, water-cooled, two-stroke, single cylinder	HD08E, water-cooled, two-stroke, single cylinder
Displacement ( cm3 )		79	79
Compression Ratio		7.3	7.4
Maximum power output (PS/rpm)		12/9,000	11/8,500
Maximum torque (kg-m/rpm)		0.97/8,500	0.94/8,000
Carburetor Type		PF26	PF26
Starting method		Primary Kick	Primary Kick
Ignition method		Non-contact CDI	Non-contact CDI
Lubrication Method		Separate lubrication type	Separate lubrication type
Lubricating oil capacity (L)		1.2	1.2
Fuel tank capacity(L)		12	8
Clutch type		Wet type multi-plate coil spring	Wet type multi-plate coil spring
Transmission type		Constant mesh 6-speed return	Constant mesh 6-speed return
Gear ratio	1st gear	3.545	3.166
	2nd speed	2.333	2.062
	3rd speed	1.722	1.500
	4-speed	1.380	1.173
	5-speed	1.173	1.000
	6-speed	1.041	0.884
Reduction ratio		4.117	4.117
Caster (degrees)		25°30′	26°30′
Trail (mm)		73	96
Tire size	before	2.75-18-4PR	2.50-21-4PR
	rear	3.00-18-6PR	3.25-18-4PR
Brake Type	before	Hydraulic disc	Mechanical Leading Trailing
	rear	Mechanical Leading Trailing	Mechanical Leading Trailing
Suspension method	before	Telescopic	Telescopic
	rear	Swing arm (Prolink)	Swing arm (Prolink)
Frame Format		Semi-double cradle	Semi-double cradle