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.