I just got my first sled.. I borrowed it last year from a friend who had the motor rebuilt and bored out 2 yrs ago... we got about 200 miles on it and the primary cluch, began sticking... well the rollers were shot and the weights were really worn. So I now ordered a comet 108exp. I am going to use Comet's gold spring and a-54 54.3 gram weights.. Now for the secondary.. I ordered EPI's quad angle stage 2 QA2 Im pretty sure that the secondary spring should be changed too... Anyone have a good spring to start with on this set up? I will be using it on the river a little but mostly trails. I would like to get it over 100mph occasionally, but also good take off... any help would be appreciated.