Originally Posted by
mutley001
Hi Guys
Just want to check that i'm going things ok
Just got my first nitro engined car and bought a go 3 port to go with it. Installed it in the car so the linkages give full movement etc. Have begun break in in accordance to the instructions that came with the engine.
Here's the bit i'm not sure about - i've done 2 tanks on the starter box at idle and on the 3rd tank. Lots of smoke from the exhaust. Takes a lot of gas to get the car moving but once going seems fine but when the gas is let off, the engine continues to rev highly (but not enough to move the car) before slowly idling down in "steps", is this a feature of running the engine rich and therefore nothing to worry about?
Temps get up to 200F on a cold day here!
Just learning so wanted to check as this thread is really informative and you guys seem really helpful, thought you might be able to advise an old time electric racer!
If it takes a little bit to get up to speed it is either way rich or lean on the low speed needle (the screw at the ball link/cup). If it blows gobs of smoke while getting up to speed, it's too rich. The high idle after letting off is from having the idle gap to large and the bottom too rich at the same time. Even with the idle gap big, it's loading up and that's what makes it seems as if it starts to idle OK.
Take off your air filter and look at how much gap the carb has when your radio is at neutral, it should be about .75 mm. I usually use a 1.5mm wrench then judge halfway. ALSO make sure it returns there every time to let off and it does not close off when braking. If the engine won't rev down properly with a gap near described, the tune of the low speed needle is off a good bit, or an air leak. Don't concentrate on an air leak until you have tried to reset the idle and the car accelerates consistently.