First, stop using premium. It's not the answer to your problem and it's causing other problems. Put 87 octane in it, give your plugs a good cleaning and keep using 87.
I'm assuming you have stock compression in the engine. Hi comp mods would justify higher octane.
Second, I'll bet your rough running problem is carb icing. I had my first icing of the season last night. I find that when it's in the 40s, my bike starts and idles just fine. But after I've ridden at any kind of speed for ten minutes or so, I experience the symptoms you describe: popping, sputtering, roug running and refusal to idle. It sucks! I'm afraid that I've found no solution.
There are apparently two carb heater kits which may or may not be available. One ran current through the float bowls to generate some heat. The other diverted the engine oil from the oil cooler (which you don't need or even want when it's colt) through the carbs. Sounds messy to me!
I'm told the other solution is Keinin FCR Flatslides: the slides rattle around preventing any ice buildup. They reportedly DON'T ice.
I'm a little surprised to hear a report of icing in Denver. I would have expected your humidity to be substantially lower than ours here which should minimize the occurance.
Of course it could be something else entirely, but it sounds too much like my bike to be coincidence!
I'm assuming you have stock compression in the engine. Hi comp mods would justify higher octane.
Second, I'll bet your rough running problem is carb icing. I had my first icing of the season last night. I find that when it's in the 40s, my bike starts and idles just fine. But after I've ridden at any kind of speed for ten minutes or so, I experience the symptoms you describe: popping, sputtering, roug running and refusal to idle. It sucks! I'm afraid that I've found no solution.
There are apparently two carb heater kits which may or may not be available. One ran current through the float bowls to generate some heat. The other diverted the engine oil from the oil cooler (which you don't need or even want when it's colt) through the carbs. Sounds messy to me!
I'm told the other solution is Keinin FCR Flatslides: the slides rattle around preventing any ice buildup. They reportedly DON'T ice.
I'm a little surprised to hear a report of icing in Denver. I would have expected your humidity to be substantially lower than ours here which should minimize the occurance.
Of course it could be something else entirely, but it sounds too much like my bike to be coincidence!
