Hi Skattergun, I'm going to put money on your carb being past its rebuild time. This stuff gets asked a lot by members who are noobs when it comes to nuts and bolts - read through the threads here covering carb woes. If you haven't pulled down a carb before, the Mikuni on these engines is not the carb you should trying your hand at first. They are complex. Try blasting it with carb cleaner, then purging the fuel bowl by taking off the air filter and with the engine running cover the throats to starve the engine of air. This will ramp the vacuum inside the carb and pull anything that might be blocking jets out. It's worth a try and normally yields an improvement. These carbs have common issues when they get tired like auto choke failure and/or no secondary throat function. Find another complete Mikuni and try swapping it but whatever you do, don't take the only carb you have apart in an attempt to fix it. The alternative is swapping the Mikuni for a Weber - this is extensively covered on mightyram and is a worthwhile performance improvement.