Free.51 2,717 Posted September 5, 2014 Hi all I'm wanting to know what the definition of 500 with a + on top & a - on bottom then 20 rpm means this is for ground idle speed on thermoquade. Thanks in advance Share this post Link to post Share on other sites
Hofiveo 47 Posted September 5, 2014 Plus or minus 20 rpm from 500. 480rpm or 520rpm. Share this post Link to post Share on other sites
Free.51 2,717 Posted September 5, 2014 Thanks very much mate Share this post Link to post Share on other sites