Originally Posted by
speedracerntrixie
Yep, your in trouble now buddy!!! LOL I recently had a 150cc twin outfitted with a Tillotson carb. There was no spring there at all when I got the engine, just a couple bushings leaving about .020 play. I was not completely happy with the idle so one time when I had the carb off the engine I went ahead and installed a compression spring. The next trip out to the field I could not get the engine started until I opened up the low speed needle. Got the carb dialed in again and the engine idled and transitioned better. If I ever get another engine without a spring, I will be adding it again without question.
I've added "C" clips to throttle shafts to accomplish the same thing. Also used bushings placed over the throttle shaft between the throttle arm and carb body to locate the shaft in the housing. Usually worked in conjunction with a factory provided "C" clip on the other side of the body. This was a common fix on WJ series carbs.