Sorry to hash this out again, but I want to make sure this will work. Question: Will the KX100 428 conversion rear sproket work for the the both the 140 and the 104L? Comment: I have been working with Rocky Mountain ATV/MC. By the end of this summer they will have in stock Primary Drive sprokets for the 140. Primary Drive last a long time and the price is right. Thanks for you help. I really need to geatr this down for my daughter.