Steve, Bryan, Wyatt, Dennis, Jason... etc. etc...
No, Steve- I wasn't suggesting that a guy should use the bellcrank's positions to set the WOT and idle limits- just that if it's set too high, or too low on the bellcrank, the engine will either not reach it's full range, or go from idle to WOT with only a CH of lever-travel.
I wasn't recommending for a nanosecond that anyone use a spring other than the -correct- one... because the spring (as Wyatt noted) is a very integral part of the system... matches the leverage ratio of the governor arm, the governor gear diameter, weights, weight leverage ratio, etc. If the spring length and rate aren't right, it ain't gonna govern worth a hoot.
I made that point, simply because I'd been fighting a no-governing situation with an engine that I'd gotten from another gentleman who had the same problem. I gave it a complete teardown/rebuild, found nothing wrong with the governor internally... and was confounded by it... and then I compared springs with another identical motor. I even put test-weights on 'em to see if they had similar rates... they were identical, save for the one was 3/8" too long.
All I can imagine, is that there's another K-motor spec that uses a similar arrangement, but the throttle bellcrank is 3/8" farther away... and some PO way-back-when must'a got da wong spwing. BTW... out of all my machines, my gov springs are either black, yellow, oily, or rusty...
I can understand how this'd happen if a governor spring broke... like... out in a field somewhere... and the guy grabs what's left of his spring (missing the long-straight end?), carries it to his local small engine shop, where a guy grabs the one he's got, thinkin' it's exactly like the one that's missin' the long-end...
Because I've seen that kind of thing happen more'n once... especially to me... and it's bound to happen, especially if the spring broke on the poor sot when he was out in his driveway, tryin' to QA42 heavy-wet snow out'a his driveway with slippin' belts and no tire chains...