A friend of mine has a 1500 with a motor trike conversion kit. The forks have had Traxxion springs put in the spring of 2011. At first everything worked as it should. However, recently, the forks do not collapse when hitting a bump or stopping at a red light. The 1500 antidive is different than the 1800 and I have never heard of one that stopped working. The spacers are the correct ones to use according to the directions from Traxxion. Any ideas as to what is wrong?