Harley runs nice in 40-50 deg. weather only

Check the front wheel. The speedo drive normally resides on the front wheel hub. Take a look at that and see if it looks normal, I'm thinking your cable broke inside the speedo drive which made the "pop" sound. There is a possibility the drive could also have cratered but this will have to be determined when the speedo drive is removed from the front axle and inspected for damage and function.

# Find a suitable and rideable Harley Davidson motorcycle. Not every Harley is suitable for 'cruising' or riding distances shorter than a few blocks or miles. If you really want to enjoy all a Harley has to offer, find a Harley that runs well, is comfortable, and one that you can handle. If you find the bike too heavy, drop down a level or improve your riding skills on another, smaller bike first. In general, the bike "heaviness" runs in the following order, from heaviest to lightest: 1. Road King 2. Softail (includes Fatboy) 3. Dyna Glide 4. Sportster * A note about the Sportster: Some consider it the most difficult to ride, despite its lightness. This is due to its relative unbalance and high placement of the gas tank thus raising the center of gravity. Despite this, it remains one of the most fun Harley's to ride, and is exemplified in carrying the honor of being the longest running production motorcycle in United States history. # Decide how you're going to get your Harley, either by borrowing, renting, or buying. Sometimes renting or borrowing (provided that you have a motorcycle license) is the best way to introduce yourself to the world of Harleys without a huge financial commitment. # Observe the bike. Look at the subtleties and richness of the chrome, or lack thereof, and special features unique to the design of the particular Harley you are going to ride. Prep the bike for ride by checking the gas level, tires, lights, and any obvious flaws or defects. # Get on the bike. Remember, "right is wrong." Get on the bike from the left side, as it is good etiquette. Feel the handlebars, feel the weight of the bike underneath you. Pull the choke if need-be. Then... # Start the bike. Listen to it. Feel it underneath you. Let it warm up as you warm up to the bike. # Ride the bike. See the road scurry underneath you. Feel the wind in your face and on your body. See how it's just much better when on the bike. Feel the rumble in between your legs. Lean back. See the blur of the side road as you look straight ahead. # Enjoy the ride. Harley Davidson motorcycles enjoy a rich and storied tradition. Riding one is not about the speed or handling of the bike per se, but rather, the enjoyment of the feel and embodiment of the entire experience. Look at the scenery, hear and feel the engine. Look to your right... to your left. Even look up at the sky - all the while making sure to keep another eye on the road to stay safe. Beware of 'cagers' ie. car drivers.