Does how you break-in your new motorcycle engine really matter?
![](https://www.popsci.com/sites/popsci.com/files/styles/1000_16x9/public/images/2019/04/mcy-engine-break-in-comparison-teaser.jpg?itok=cAD0aCuw&fc=50,50)
![](https://www.popsci.com/sites/popsci.com/files/styles/1000_16x9/public/images/2019/04/mcy-engine-break-in-comparison-teaser.jpg?itok=cAD0aCuw&fc=50,50)
Motorcyclist compared the wear of two run-in methods.
We rebuilt two used Honda CB300F engines with new top-end parts and broke them in differently over the course of 1,000 miles. Then we compared the results.
via Popular Science "http://bit.ly/2KIIdy1"
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