Joe Aderholdt
New member
When my DT40 first starts it only runs on the top cylinder. There is a ton of spark coming from the wire and the plug is new, 120 psi compression. Everything seems right, but won't run on 2 cylinders until up to about 1/2 speed, then it takes off like a rocket, runs great for about 30 seconds then dies completely. Restarting is easy, but the same ritual is repeated. Runs pretty well if you never exceed about 3/4 throttle. Carb is clean, but old fuel lines, fuel pump etc. What's going on?