<span style="font-size: medium">I finally started my new O.S. FS40 four-stroke yesterday after almost 10 years in the box. After priming it started right away, but as I leaned it out at full throttleit started toknock. I backed the throttle down and it went away. At full throttle and a rich needle valve setting, there was no knock. Anyone have any thoughts why it's knocking? Is it a new engine breakin issue? I don't see how any kind of knocking can be good. Thanks!!
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