Jroyce

This bike has been a two year project. Bored to 71mm with a wiesco piston. Boyensen reeds. All new seal and gaskets. Polished the ports and head. Exhaust is clean. K&N air filter. Carb has been gone through. Here is the issue. In order to adjust the idle to maximum speed before adjusting the idle speed screw I have to turn the idle air screw at least three turns out. Has a miss up to about 4,000 and the it cleans up and runs strong. It just seems to be running rich based on the performance and the spark plug. Black sooty carbon. Running an NGK iridium plug. Any suggestions? Thx JR

Took a long time to get the opening point of the points just right. Made a wire with a horseshoe connected. Disconnected the wire at the points. Connected it there and the other lead for the test light to ground. This eliminated the light dimming thing. It was either on or off. Turned the magneto with a ratchet. That way no flex on the mag. I noticed that doing it by hand could change the reading significantly. Been reading up on the Mobil 2t. Thinking the injection level is too high. JR

I am the proud owner of a 77 dt250. Ground up. All seals replaced in the engine. Wiesco 1mm over piston and rings. Boyensen reed valves. New points and condensor. Spent countless hours getting the timing right. It has a horrible mid range miss. Plug is dark black carbon. Stock jetting in carb. Float is set correctly. Starts like a champ first kick. Excellent compression. Dialed the injection pump back a little from factory recommended. Using Mobil 1 synthetic 2 cycle. Any thoughts? Some smoking at idle. Not a fogging but noticeable. Just sputters at a steady throttle.