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Engine Identification
All engines in the family displace 1990 cc with an 89-mm bore and an 80-mm stroke. The suffix "U" indicates smog gear, which was far more complex than used on American engines of the same period, and "E" stands for electronic fuel injection. If possible, avoid the 18RGU, with its throwaway carburetors and arcane smog hardware.
18RG - dohc, 9.7:1 compression ratio, Toyota cylinder head, no smog hardware and 140 hp. Very rare and desirable.
18RGR – dohc, 9.2:1 compression, Toyota head, air injection, and EGR. Rated at 130 hp.
18RGRU – dohc, Yamaha head, 9.2:1 compression, complex smog gear. 125 hp.
18RGU – dohc, Yamaha head, 9.2:1 compression, non-rebuildable carburetors, smog hardware and a throwaway electronic ignition. This 120-hp engine appears to be most frequently encountered.
18RGEU - dohc, Yamaha head, 8.7:1 compression and electronic fuel injection. Said to develop 120 hp.