Released in 1972 as a 1973 model, the Kawasaki Z1 900 was a direct shot at the Honda CB750. Its 903cc DOHC inline-4 engine produced 82 hp, making it the most powerful Japanese motorcycle of its time and earning it the 'King of the Road' nickname. The Z1 set a new performance benchmark and established Kawasaki's identity as a builder of fast, aggressive bikes. Early models are prized for their purity, while the later Z1-R (1978-1980) offered factory cafe racer styling and a larger 1015cc engine.
The Z1's significance as a performance icon makes it a cornerstone for any serious collection of Japanese motorcycles. Originality commands the highest prices, especially for 1973 models with their correct paint and 4-into-4 exhausts. The market is mature, with an average sale price over $15,000 reflecting strong demand for quality examples. While project bikes can still be found for less than $5,000, top-tier restored bikes and rare variants like the Z1-R push prices past $30,000.
Buying Tips
- Verify matching frame and engine numbers. Early 1973 Z1s should have numbers that are very close to each other.
- Check for the original 4-into-4 exhaust system. Many were replaced with aftermarket 4-into-1 pipes, and finding an original set is expensive.
- On Z1-R models, inspect the unique cockpit fairing for cracks or damage. These are difficult to find and costly to replace.
- Look for rust inside the fuel tank and on the frame's lower tubes. Also, listen for cam chain noise, as the original tensioner design was a known weak point.
Prices range from $3,600 for projects to $30,500 for pristine, low-mileage examples.
73 Kawasaki Z1 & Z1-R vehicles have been tracked across auctions and listings on Hypercars, with 2 currently live. Sold prices range from $3,000 to $30,500.
Data sourced from Bring a Trailer, Cars & Bids, eBay Motors, PCarMarket, and Collecting Cars. Updated daily.
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