| 21. | Honda straight-twin engines, which began appearing in the late 1950s, had four main bearings.
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| 22. | Robust 7-main bearing block design, like all L-series six-cylinder engines.
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| 23. | The bottom of the block formed the parting line for the main bearing caps.
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| 24. | This put additional strain on the main bearings and crankcases, leading to reliability problems.
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| 25. | The 124-series engine has five main bearings, an iron block and an alloy head.
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| 26. | The block was specially cast and crankcase was fitted with four bolt main bearing caps.
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| 27. | A single main bearing may provide oil for 0, 1 or 2 big end bearings.
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| 28. | The straight-six was a four main bearing 12 overhead valve design with a short stroke.
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| 29. | Mechanically, they are simple straight-4 engines with five main bearings crankshaft and overhead cam heads.
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| 30. | The lifter bank has four galleys that lead to each of the remaining main bearings.
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