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I wouldn't go as far as lowering the rev limiter. Let's first ask how some engineer came up with 15000 as the soft limit. I like to think of it as the SWAG method. Scientific Wild Ass Guess. There are a couple factors that drive this number. The gears, bearings, and balance of the screws. Bearings and gears are rated on quality and precision. Given the tolerance and variance they come up with a worst case scenario and guess at an rpm which it Should not fail. That means the bulk of the bearings should out perform this number. And why 15000 and not 14950 or 15220? Because it is an estimate.
You are supposed to replace the timing belt on a honda at 90k I think. Why? Because that's when Honda has seen the earliest failures. 98.5% will last longer. I have seen one last 180k honda isn't going to tell u that though.
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