Motorcycle Repair: cold start, suzuki gn 125, light resistance

Question
I have a suzuki gn-125 I have had since 86. It has sat for several years,I took apart and cleaned carb.I have riden oprox 150 miles since done.runs good going down road but in the am when I start bike I have to shake it a little to get it started.I have a slight miss at idle,can you help me find a solution for this problem, If so thanks

Answer
David,
  All the symptoms you are describing point to the slow main circuit in the carburetor. It most likely is still plugged/partially plugged with varnish from the old fuel. If the idle jet is removable make sure you can see a small pin hole thru it. If you can’t you’ll need to soak it in a carb cleaning solution then use a small wire to clean the varnish from the jet. Be careful not to open the hole up so don’t use anything harder than a strand of copper wire. A good soak for the carburetor would be a good idea to (unassembled). Use compressed air where you took the idle jet from and make sure the passages are clean. Main jets hardly ever clog because of the size of the hole but the slow mains are prone to it. Also make sure the choke system is clean to. The adjustable needle for the idle circuit will need to be removed but before you take it out carefully screw it in to a light resistance is felt and count the turns as you go in and write this down, you’ll want to clean that passage with compressed air and reinstall the screw where it was. You might have to adjust to fine tune later after warm up. If the slow main jet is not removable all the steps still apply but a longer soak in a carb cleaning solution and make sure with compressed air that the jet is open looking thru the throttle bore while using the compressed air you should see it come thru a small hole near the intake side of carburetor.