Kawasaki Z1 900
87/100 Overall
73 On the road100 As a classic
Classic motorcycle head-to-head
Kawasaki Z1 900 vs Yamaha RS100
Kawasaki Z1 900 scores 87/100 overall against Yamaha RS100 on 68/100. On the road: 73–62. As classics: 100–73. Overall result: Kawasaki Z1 900.
Photo: Seán Pòl Ó Creachmhaoil · CC BY-SA 4.0
Yamaha RS100
68/100 Overall
62 On the road73 As a classic
The numbers
Category-by-category result
| Category | Kawasaki Z1 | Yamaha RS100 | Advantage |
|---|---|---|---|
| road | |||
| PerformanceDirect comparison of power, acceleration and usable performance across the pre-1990 classic field. | 9 | 4 | Kawasaki Z1 |
| HandlingSteering, stability, weight and real-road manners. | 6 | 7 | Yamaha RS100 |
| BrakingDirect comparison of real stopping ability without an age allowance. | 6 | 5 | Kawasaki Z1 |
| ReliabilityEngine, electrics and general dependability when properly maintained. | 8 | 8 | Level |
| Ease of ownershipMaintenance, parts supply and access to specialist knowledge. | 8 | 8 | Level |
| ComfortRiding position, vibration and suitability for longer journeys. | 7 | 5 | Kawasaki Z1 |
| classic | |||
| StylingDesign quality, visual presence and period appeal. | 10 | 7 | Kawasaki Z1 |
| Historical importanceInfluence on motorcycling and importance within its era. | 10 | 7 | Kawasaki Z1 |
| Collector appealLong-term desirability among classic motorcycle enthusiasts. | 10 | 7 | Kawasaki Z1 |
| CharacterSound, feel, personality and memorable riding experience. | 10 | 8 | Kawasaki Z1 |
Choose the Kawasaki Z1 if…
you want muscular 1970s superbike performance, imposing styling and major Japanese collector status.
Choose the Yamaha RS100 if…
you want a simple, light and economical Yamaha that represents everyday British learner transport in the late 1970s.
Background
History
Kawasaki Z1
The Kawasaki Z1 900 was produced from 1972–1975 and used a 903cc air-cooled DOHC inline four. Within this comparison library it stands out particularly for styling, historic importance, collector appeal. It suits riders who value the qualities described in its original profile rather than choosing by specification alone.
Yamaha RS100
The Yamaha RS100 was produced from 1975–1980 and used a 97cc air-cooled two-stroke single. Within this comparison library it stands out particularly for reliability, ownership appeal, character. It suits riders who value the qualities described in its original profile rather than choosing by specification alone.
Interesting details
Did you know?
Kawasaki Z1
- Its production span in this library runs from 1972 to 1975.
- The recorded engine description is: 903cc air-cooled DOHC inline four.
- Its strongest comparison scores are styling, historic importance, collector appeal.
Yamaha RS100
- Its production span in this library runs from 1975 to 1980.
- The recorded engine description is: 97cc air-cooled two-stroke single.
- Its strongest comparison scores are reliability, ownership appeal, character.
Present-day appeal
Collector notes
Kawasaki Z1
Collector interest is strongest where condition, originality and correct period details support the identity of the Kawasaki Z1 900. Its library score for styling is 10/10. Values and desirability can vary substantially between years, specifications and restoration quality, so individual examples should be assessed on their own evidence.
Yamaha RS100
Collector interest is strongest where condition, originality and correct period details support the identity of the Yamaha RS100. Its library score for reliability is 8/10. Values and desirability can vary substantially between years, specifications and restoration quality, so individual examples should be assessed on their own evidence.
Before you buy
Buying checks
Kawasaki Z1
- Confirm the frame and engine identity match the advertised model and year.
- Check cold starting, smoke, oil leaks and unusual mechanical noise.
- Check carburettor balance, charging output and exhaust condition across all cylinders.
- Inspect the frame, wheels, brakes and suspension for wear, damage or poor repairs.
- Verify that important model-specific parts have not been replaced with incorrect later components.
- Review the paperwork, ownership history and any restoration invoices before purchase.
Yamaha RS100
- Confirm the frame and engine identity match the advertised model and year.
- Check cold starting, smoke, oil leaks and unusual mechanical noise.
- Check the oil-injection or premix arrangement, crank seals and exhaust condition carefully.
- Inspect the frame, wheels, brakes and suspension for wear, damage or poor repairs.
- Verify that important model-specific parts have not been replaced with incorrect later components.
- Review the paperwork, ownership history and any restoration invoices before purchase.
Period opposition
Historic rivals
Rivals to the Kawasaki Z1
Rivals to the Yamaha RS100
Final result
The verdict
Kawasaki Z1 900 wins the direct on-the-road comparison. Kawasaki Z1 900 wins the classic-motorcycle comparison. Kawasaki Z1 900 takes the overall result after the road and classic scores are weighted equally.