Ok I see what you are talking about. The way I read your post it sounded as though there was one Pilot screw over the top of another
I believe the guy you talked to was suggesting you drill out the main jet but you can confirm this with him a you said.
My son started riding his JR 50 a week before his 4th B-day. He saw me unload it and asked why I had it and I said it was for your Birthday next week. He asked me "can I ride it now?" I said SURE! My son flys around the house now and even highsided it once. I thought he would never ride it again after that crash but he got right back on and kept going.
I had installed a set of the training wheels that the guy on EBay sells. Just look up JR50 and you will see them. I paid 45.00 plus shipping. Very good product and bilts right on.