Classic and Classy Motorcycles Ltd

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1970s Kawasaki Z650 Valuation Report

Date: November 2025

Historical Overview

The Kawasaki Z650 (B-series, c.1976–1979) was the middleweight sibling to the Z1/Z900, praised for its balance of performance and usability. In the UK, Z650s remain sought after as an attainable 1970s four-cylinder with strong parts support. Values vary with originality, matching numbers, and quality of restoration.

UK Valuation Summary (by condition)

Condition	Estimated Value (GBP)	Evidence (Sold vs Asking)
Project / Restoration Non-running, incomplete or needing major work.	£1,200 – £2,200	UK classifieds show rough or non-running Z650s advertised from c.£1,500–£2,000 (asking). Limited confirmed auction data at this level; band inferred from market and parts costs (UK).
Roadworthy / Presentable Running and usable; older paint or light mods acceptable.	£2,800 – £4,200	SOLD: Iconic Auctioneers, 1979 Z650, sympathetically restored, £3,825 hammer (UK). SOLD: Manor Park Classics, 1979 Z650 B, running and in good order, £3,068 hammer (UK). Asking data in late 2025 generally £3,500–£4,500 for tidy riders.
Restored / Excellent High-quality restoration or very original low-mile bike with history.	£4,500 – £6,500	Upper band reflects UK asking levels for fully restored examples (dealers/private). Few recent confirmed UK hammer results above ~£4k; top band therefore an estimate guided by market asks and quality of restoration.

Notes: Early B1–B2 bikes in correct paint/decals with 4-into-2 exhausts and matching numbers tend to perform best. Non-original exhausts, resprays far from factory schemes, or missing airbox/side covers normally soften prices. Genuine history, UK registration, and period accessories can help.

Value Influencing Factors

Originality: Correct bodywork, paint codes, instruments and airbox are key. 4-into-2 pipes generally preferred over later 4-into-1 swaps.
Mechanical health: Carb condition, charging/ignition, and top-end work drive buyer confidence and auction outcomes.
Provenance: UK-supplied bikes with matching numbers, history file, and correct V5C support stronger results.
Timing: Spring/summer auctions and classic events usually lift demand versus late-year sales.

Conclusion

In the UK as of November 2025, 1970s Kawasaki Z650 values cluster around £2.8k–£4.2k for running, presentable riders, with confirmed hammers at approximately £3.1k and £3.8k supporting that band. Projects are typically £1.2k–£2.2k depending on completeness. Fully restored or excellent examples are commonly asked at £4.5k–£6.5k; however, recent confirmed hammer prices above ~£4k are limited, so the top band should be treated as an estimate guided by market asks rather than multiple high hammer results.

Sources (plain text):
Iconic Auctioneers — 1979 Kawasaki Z650 sold for £3,825 (UK, July 2021).
Manor Park Classics — 1979 Kawasaki Z650 B sold for £3,068 (UK, Feb 2025).
UK classifieds/dealers — late 2025 asking levels typically £3,500–£6,500 depending on condition and originality.

All Valuations

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