Quote:
Originally Posted by Undertow
For GP300 -18, I switched from stock head to S3 and high comp insert (the medium one that came with the head).
Stock head had wayyy too much compression. Pinged every time I closed the throttle. S3 head made it a lot smoother to ride with nice fuel economy.
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Another strange thing. Must be a quality issue, none of my 2019's (both 300's) pinged on deceleration...