I looked at my plug a month ago and it was grey/white so I put the carb needle up a notch to raise the needle. Then I took apart the carb and sprayed it out and got the part numbers on the jets and confirmed it was stock. Last weekend after running I checked the plug and it was bone white, way too lean. I raised the needle more. The engine also did this weird thing where when I started it full choke, if I lowered the choke bar, the idle went way up. When it was hot this problem went away and it seemed normal. The engine is used but I don’t want to blow it up. Can anyone diagnose what’s wrong? The temperature last weekend was in the 90’s, but shouldn’t that richen it up?
When I raced at Dixon, I saw the rubber cover on the throttle cable at the top of the carb was cracked pretty bad, so I taped it up with electrical tape. Do you think air could enter the carb at this spot? That might explain the weird idling problems. I will see if it happens again with the rubber cover taped up.
First, both of our 206’s idle high when we first start them. But after a minute or so, they settle down and are fine. I don’t know why, nor do I care. I’m only concerned how they run on the track and hot. My kart doesn’t like to idle at all, and I’m OK with that too. Our ultra high tech automobiles don’t always behave properly when they’re first started. Why would you expect a very inexpensive, low tech, industrial, rototiller motor to do better?
The rubber boot thing is a none issue to the best of my knowledge. It simply holds the outer throttle cable in the top of the carb. We’ve run engines with and without them and I never gave it much thought.