Originally Posted by
Hobbsy
The carb spring is just a feel good thing and totally not needed. When carbs had an idle speed screw the springs helped because they were a sloppy fit in the groove.
Yep, no need for a throttle spring. I use the throttle trim to adjust idle & shut the engine down.
I also use it to reduce cylinder pressure so I can start large displacement engines (even my FA-300TTDP) W/a 90 sized electric starter. I only use the starter for he initial start if the day.
After the fuel system is primed & the engine warmed, I flip start.