The function of the govenor spring is to OPEN the throttle. The spring force is opposed by the govenor - which on the SV150 is simply an air vane. Apart from the spring tension, there is no adjustment possible. If the engine seriously over-revs, then either the spring is twisted, of somethng is physically jammed or bent.
phil_saunders(a)bigfoot.com
Phil Saunders, November 2009
