Interesting Facts About the Yamaha XJ 650 MOD. 4K0
The Yamaha XJ650 Maxim debuted in 1980 as a mid‑size, sporty motorcycle and stayed in production through 1983. Early versions (1980‑81) used a different engine crankcase, jugs and heads compared with the later YICS‑type components introduced in 1982.
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Launch and Production Run
Yamaha introduced the XJ650 Maxim in 1980, branding it as the Maxim I, and continued manufacturing the model until 1983, positioning it as a versatile mid‑size bike.
Engine Lineage Within the XJ Series
The XJ series’ engines were later souped‑up to 900 cc, and the fifth‑generation engine eventually replaced the fourth‑generation Genesis engine in Yamaha’s lineup.
1980‑81 vs. 1982‑Onward Engine Parts
Models from 1980‑81 featured non‑YICS engine crankcase shells, jugs and heads, as well as distinct wiring harnesses, while bikes built from 1982 onward adopted YICS‑type components and updated wiring.
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Yamaha XJ 650 Parts
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