HI. I'm Nigel, After 35 years of carrying out safety inspections on lifts & lifting equipment, and having had major surgery for Prostate cancer, I took early retirement in 2014. I immediately started volunteering with our local Wildlife Trust and, especially as I was already chainsaw trained, managed to wheedle myself in until I was doing a lot more than just joining a work party once a week. I now get to play with all the toys, including the Ferrari two wheeled tractors, the modern Italian made equivalent of the Allen Scythe (not that fast really, but great fun, I think).
Anyway, earlier this year my father in law asked me to get his old Punch 35S up and running. It had been left in the shed for quite a few years as he'd been using Honda rotary with a roller fitted , but it was getting too heavy for him. I didn't stop at just getting it running and, by the time it went back, it was a pretty smart machine. I posted a few photos on FB and came home one day to find a old, tired looking 35DL stuffed behind the front hedge, left by a friend. My wife wasn't as pleased as I was because we already have two other lawnmowers, 3 brushcutters, chainsaws & various other stuff.
So the second mower project is now underway. And here's where the query comes in.
The machine has a Zenith carb with a fixed main jet. On the LH side is a small coil spring, anchored at one end to a bracket with the other end looped over the end of the throttle spindle. It doesn't really appear to do anything, except maybe exert a little friction on the rotation of the spindle. I've got what Zenith manuals I can find on t'internet, but can't find out what this is. Can anyone enlighten me?