Classic and Classy Motorcycles Ltd

1970s Harley‑Davidson SX175 175cc Valuation Report

Date: August 2025

Historical Overview

The Harley‑Davidson SX175 was one of a trio of small-capacity two-stroke models developed after Harley-Davidson acquired Aermacchi in the 1970s. Built between approximately 1974 and 1978, the SX175 featured a 174cc two-stroke single cylinder, 5-speed gearbox, kick-start, and was designed to compete in off-road and motocross markets. It is now rare in the UK and considered highly collectible.

Valuation Analysis

UK values for SX175 examples vary significantly based on condition due to rarity and limited trading activity:

• Project Condition: £2,000 – £3,500
  Often imported from the US, non-running or in need of major recommissioning. UK dealer listings show barn-find examples offered around £2,500. (Source)
• Roadworthy / Running Condition: £4,000 – £6,000
  Examples described as untouched but rideable, with mileage up to ~1,300 miles and offered for ~£3,999–£4,999 in the UK. (Source)
• Restored or Rare Mint Examples: £6,000 – £8,000+
  Very rare and highly preserved or restored models; e.g., a 1976 SX175 with only 4 miles sold in the US for a high price. (Source)

Factors Affecting Value

• Rarity: The SX175 was produced in small numbers and saw minimal UK market penetration—finding one with V5C and age‑related plates increases value.
• Condition: Clean surfaces, original paint, engine turns over, and lack of rust significantly improve desirability.
• Documentation: US title plus NOVA clearance evidencing legal import helps with UK registration and builds confidence.

Conclusion

The SX175 remains one of Harley-Davidson’s rarest models in the UK. Project machines still demand respectable prices due to rarity, while running and preserved examples can push into the upper ranges. Fully restored or exceptionally preserved models may exceed £6,000 when sold through specialist UK channels.

All Valuations