Spitfire Stromberg too rich

I have a '79 Spitfire 1500 with a ZZ150 CD carb. I get heavy dry
carbon deposit on the plugs and black smoke at idle out the tail pipes.
I just got the Guston Colortune and was giving that a shot. I have
the fuel/air mixutre as lean as it will go (using that special tool).
It does not seem to make any difference. I am still running too rich
and cannot get the blue flame at all at idle with the Colortune. When
I lift the piston with my finger a touch, I get the blue flame I am
looking for, but I don't have anymore turns left on the needle to make
it leaner. Any ideas?

In article . com>,
> wrote:
>I have a '79 Spitfire 1500 with a ZZ150 CD carb. I get heavy dry
>carbon deposit on the plugs and black smoke at idle out the tail pipes.
> I just got the Guston Colortune and was giving that a shot. I have
>the fuel/air mixutre as lean as it will go (using that special tool).
>It does not seem to make any difference. I am still running too rich
>and cannot get the blue flame at all at idle with the Colortune. When
>I lift the piston with my finger a touch, I get the blue flame I am
>looking for, but I don't have anymore turns left on the needle to make
>it leaner. Any ideas?
>


thicker needle? Make sure the seat is at it's highest height.
I don't know how the choke works on the ZZ150 but I've had
the choke stick on SU clones (hitachi) w/the seat lower than
it should be...

--Ken

--
Ken R. Dye an optimist is a guy |
Chicago, Illinois that has never had |
www.geocities.com/MotorCity/Track/8746 much experience |
dye1146 at comcast dot net archy |

On 12 Nov 2006 21:43:35 -0800, wrote:

>I have a '79 Spitfire 1500 with a ZZ150 CD carb. I get heavy dry
>carbon deposit on the plugs and black smoke at idle out the tail pipes.
> I just got the Guston Colortune and was giving that a shot. I have
>the fuel/air mixutre as lean as it will go (using that special tool).
>It does not seem to make any difference. I am still running too rich
>and cannot get the blue flame at all at idle with the Colortune. When
>I lift the piston with my finger a touch, I get the blue flame I am
>looking for, but I don't have anymore turns left on the needle to make
>it leaner. Any ideas?


Is it possible the float needle is leaking (or the float is sinking)
and the bowl level is too high?