I recently bought a carb re-build kit from a shop aroud here for my 98 Springer that didn't have any instructions in it. It was an older one that they were going to take to a swap meet but had all of the parts in it I need to re-build my carb. I drilled the vacuum port, replaced the spring with the lighter one, put in a 45 slow and 180 main and put the stock needle with one shim in. The bike runs much better, throttle response is great, but have a little cough back through the carb when cold. Should I be using one of the two needles supplied with the kit? One has a lot more taper and is about a 16th longer. I did change the carb stem or whatever you call it that the main screws into to the one in the kit. My evo has a D&D 2into1 Fatcat and SE a/c, otherwise stock.