 |
Name:
90S, 90SS, 90SSS, Bush Master, Trail Boss |
Type:
GA1, GA2, GA3, G3, G3-TR, 90-TR |
From:
1969 - 1974 |
|
|
GENERAL |
|
Model name |
1968-74 GA1 / GA2 |
1969-74 G3SS / 1969- 75 GA3 |
1970-? 90-TR |
1969-70 G3-TR |
|
Type |
90S / 90SS |
90SS / 90 SSS |
90-TR |
Bush Master |
|
Category |
Street bike |
Street bike |
Dual sport |
Dual sport |
|
ENGINE |
|
Type |
2 stroke, single cylinder, rotary disc valve, air cooled. |
2 stroke, single cylinder, rotary disc valve, air cooled. |
2 stroke, single cylinder, rotary disc valve, air cooled. |
2 stroke, single cylinder, rotary disc valve, air cooled. |
|
Displacement |
89 ccm |
89 ccm |
89 ccm |
89 ccm |
|
Bore and Stroke mm (in.) |
47.0 X 51.8 mm |
47.0 X 51.8 mm |
47.0 X 51.8 mm |
47.0 X 51.8 mm |
|
Compression ratio |
7.0:1 |
7.0:1 |
7.0:1 |
7.0:1 |
|
Valve system |
rotary valve |
rotary valve |
rotary valve |
rotary valve |
|
Fuel system |
Mikuni VM19SC |
Mikuni VM19SC |
Mikuni VM19SC |
Mikuni VM19SC |
|
Ignition |
Flywheel magneto |
Flywheel magneto |
Flywheel magneto |
Flywheel magneto |
|
Spark Plugg |
NGK B7HS 0.6 - 0.7 mm gap |
NGK B7HS later NGK B8HCS 0.6 - 0.7 mm gap |
NGK B8HCS or B8HS 0.6 - 0.7 mm gap |
NGK B8HCS or B8HS 0.6 - 0.7 mm gap |
|
Starting |
Kick |
Kick |
Kick |
Kick |
|
Lubrication |
Superlube Oil Injection |
Superlube Oil Injection |
Superlube Oil Injection |
Superlube Oil Injection |
|
DRIVETRAIN |
|
Transmission |
5-speed, constant-mesh |
5-speed, constant-mesh |
5-speed, constant-mesh |
5-speed, constant-mesh |
|
Shift Pattern |
N-1-2-3-4-N / N-1-2-3-4-5 bottom up |
N-1-2-3-4-5 bottom up |
N-1-2-3-4-5 bottom up |
N-1-2-3-4-5 bottom up |
|
Final
drive |
chain
2.64 (37/14) |
chain
2.64 (37/14) |
chain |
chain
2.64 (37/14) |
|
Primary ratio |
3.52 (74/21) |
3.52 (74/21) |
3.0 |
3.52 (74/21) |
|
Overall Ratio |
8.92 top gear |
8.92 top gear |
|
8.92 top gear |
|
Gear
ratios: |
1st |
2.92 (35/12) GA2 |
2.92 (35/12) |
2.92 (35/12) |
2.92 (35/12) |
|
2nd |
1.76 (30/17)
GA2 |
1.76 (30/17) |
1.76 (30/17) |
1.76 (30/17) |
|
3rd |
1.30 (26/20)
GA2 |
1.30 (26/20) |
1.30 (26/20) |
1.30 (26/20) |
|
4th |
1.09 (24/22)
GA2 |
1.09 (24/22) |
1.09 (24/22) |
1.09 (24/22) |
|
5th |
0.96 (23/24)
GA2 |
0.96 (23/24) |
0.96 (23/24) |
0.96 (23/24) |
|
Clutch |
Wet multiple plates, manual |
Wet multiple plates, manual |
Wet multiple plates, manual |
Wet multiple plates, manual |
|
FRAME |
|
|
GA1 / GA2 |
G3SS 90 SS/ GA3 90 SSS |
90-TR |
G3-TR |
|
Type |
|
|
|
|
|
Caster |
|
|
|
|
|
Rake / Trail |
|
|
|
|
|
Wheel
travel: |
Front |
|
|
|
90
mm |
|
Rear |
|
|
|
65
mm |
|
Tyre: |
Front |
2.50-18 4PR (tube
type) |
2.75-18 4PR Tube-Type |
2.75-18 4PR Tube-Type |
2.75-18 4PR Tube-Type |
|
Rear |
2.50-18 4PR (tube
type) |
2.75-18 4PR Tube-Type |
3.0-18
4PR Tube-Type |
2.75-18 4PR Tube-Type |
|
SUSPENSION |
|
Front: |
Type |
Hydraulically damped telescopic
fork |
Hydraulically damped telescopic
fork |
Hydraulically damped telescopic
fork |
Hydraulically damped telescopic
fork |
|
Rear: |
Type |
Hydraulically damped swinging
arm |
Hydraulically damped swinging
arm |
Hydraulically damped swinging
arm |
Hydraulically damped swinging
arm |
|
Spring
preload |
- |
- |
- |
- |
|
BRAKES |
|
Front: |
Type |
Mechanical Drum 110 X 30 mm |
Mechanical Drum 110 X 30 mm |
Mechanical Drum 110 X 30 mm |
Mechanical Drum 110 X 30 mm |
|
Calliper |
|
|
|
|
|
Rear: |
Type |
Mechanical Drum 110 X 30 mm |
Mechanical Drum 110 X 30 mm |
Mechanical Drum 110 X 30 mm |
Mechanical Drum 110 X 30 mm |
|
Calliper |
|
|
|
|
|
DIMENSIONS |
|
Overall
lengt mm (in.) |
1810 mm |
|
1925 mm |
|
|
Overall
width mm (in.) |
740 mm |
|
815 mm |
|
|
Overall
height mm (in.) |
1020 mm |
|
1055 mm |
|
|
Wheelbase mm (in.) |
1150 mm |
1150 mm |
1260 mm |
1150 mm |
|
Ground
clearance mm (in.) |
150 mm |
160 mm |
230 mm |
160 mm |
|
Seat
height mm (in.) |
|
770 mm |
|
770 mm |
|
Dry weight |
79 kg |
83
kg |
85 kg |
83
kg |
|
Fuel
capacity l |
6.5
liters |
8.6 liters |
9.5 liters |
8.6 liters |
|
PERFORMANCE |
|
|
GA1 / GA2 |
G3SS / GA3 (SSS) |
90-TR |
G3-TR |
|
Maximum
power |
10.5 @ 8000 rpm |
10 @ 7500 rpm / 10.5 @ 8000 rpm |
|
10.5 @ 8000 rpm |
|
Maximum
torque |
0.98 kg-m @ 7000 rpm |
0.98 kg-m @ 7000 rpm |
|
0.98 kg-m @ 7000 rpm |
|
Performance 1/4 mile |
|
|
|
|
|
Top Speed |
110km/h |
105km/h |
100km/h |
|
|
|
|
YEAR |
FRAME NUMBER |
ENGINE NUMBER |
COLOUR |
| 1969 GA1 |
GA-200001- |
GAE-000001- |
Black |
| 1969 GA2 |
GA-200001- |
GAE-200001- |
Candytone Red, Candytone Blue |
| 1969 G3SS Bush Master |
GA-200001 - |
G3E000001- |
Pastel Orange |
| 1970 G3SS Bush Master |
GA-20000- |
G3E00000 |
Pastel Orange |
| 1969 -70
G3SS |
GA-000001- |
GAE000001- |
Pastel Blue, Candytone Blue |
| 1971 G3SSA |
GA-268327- |
GA268738- |
Light
Yellow, Bright Orange |
| 1972 G3SSB |
GA-306826- |
GA280935-- |
Pearl
Candytone Red |
| 1973 G3SSC |
GA-329103- |
GA292961- |
Candytone
Orange |
| 1974 G3SSD |
GA-355001- |
G8E507550- |
Candytone
Lime |
| 1969 GA3 |
GA-200000- |
GAE-200000- |
Pastel Orange |
| Source
Kawasaki -ID guide 1965 -1975 |
|
