Dispensing with the liner meant there were no water leaks into the sump, whilst the bores were truer and there were no real problems with wear. Integral cylinder bores were first introduced on the three-cylinder engine, fitted to the 880 lmplematic in 1964 and the 770 Selectamatic in 1965, but it was 1968 before they were seen in production models of the popular 990 (4/49 engine).
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