Still can't get a decent idle

[tomarnold]

I have had some great flights over the past few evenings - some high flights up with the clouds, and some low ones doing a bit of hedge-hopping. Great fun. However, if I let the motor idle (for example when I want to lose some height) the idle will start fine at around 2400rpm, which is what Fresh Breeze recommend for their solo 210 motor, but this only lasts a few seconds before it dies down and down and down to a very lumpy 1200 or so. Then when I throttle back up it gives a little hiccup before picking up smoothly. I have cleaned the carb thoroughly and checked the float level (Bing 84 carb) and changed the plug and cap, but can't get to the bottom of the problem.

Any thoughts?

[tomarnold]

Also, I should mention that I have got the idle screw screwed all the way in in order to get that idle speed. If I screw it back out at all the idle speed is too low to work at all. Would a new idle jet solve the problem I wonder?

[notch]

Sounds like your idle mixture is too rich.

A smaller idle jet?

If this has just started happening (you haven't moved countries or changed altitudes), then there may be something else causing it - loss of compression, worn reeds, carb issue etc.

[tomarnold]

Sounds like your idle mixture is too rich.

A smaller idle jet?

If this has just started happening (you haven't moved countries or changed altitudes), then there may be something else causing it - loss of compression, worn reeds, carb issue etc.

I reckon the idle jet may be the cause - I haven't owned the motor long and it has never idled right in my ownership. I don't think there's any other engine issue causing it as it runs so well throughout the rest if the rev range.