If I'm using 14.3 crosmans, it indexes perfectly. If I use a heavier pellet, 15 or 18 grains , it indexes about halfway thru the cycle and stops. Any advice from the experts here?
I would start by adjusting the set screw right in front of the magazine that controls how much the mag indexes. Loosen the grub screw on the left then back out the one on top a little bit to allow for the mag to rotate more freely, retighten the left screw and test. Hope that solves it for you...
The Reg and jets ratio is not correct, the indexing mechanism gets too much air and that makes it advance faster but the pellet didn't jumped yet completely over to breach. Pinching the pellet. Follow the instructions above - or increase the jets