6 replies to this topic

[andy69]

hi all the wifes mini seems to be using a lot of petrol and the end of the exhaust is getting sooted up is it running rich and how do i adjust mixture on carb
many thanks Andy

[T.Harper]

We need to know what carb it is. If it's an SU HS type (with the float bown on the side) it has a little pipe at the bottom of it going up to two nuts, you screw the bottom one anticlockwise from above to weaken the mixture - but this may not be the long term answer -

Has the car only just started doing this? If so it could be down to a leaking float bowl valve or a stuck jet - or even a faulty waxstat jet. All cheap to repair but a bit more info needed on the engine and carb and problem please - pictures might help.

[andy69]

We need to know what carb it is. If it's an SU HS type (with the float bown on the side) it has a little pipe at the bottom of it going up to two nuts, you screw the bottom one anticlockwise from above to weaken the mixture - but this may not be the long term answer -

Has the car only just started doing this? If so it could be down to a leaking float bowl valve or a stuck jet - or even a faulty waxstat jet. All cheap to repair but a bit more info needed on the engine and carb and problem please - pictures might help.

hi mate its always seem to use petrol,the carb is the one with the bowl on the side and little pipe under carb

[AzMaN]

what ya need in a haynes manual and a "gunsons colourtune" kit, or get it rolling roaded.

[998dave]

Most likely an HS4 carb, take a look at Haynes which'll explain how to tune it a bit.

Are you sure you've got an appropriate needle in it? If the inlet and exhaust manifolds and systems are standard it should be an AAC, (check in Haynes).

You could colourtune, or use a CO exhaust gas meter to check if it's much to rich.

Oooor, run it for a few miles, and check the spark plug colour.

Dark and sooty, too rich.
pale tan - about right
white - too lean.

Dave

[andy69]

thanks all i will take a look at haynes manual just got one today

thanks again Andy

[Nick Warwick]

mines the same as this running very rich, very sooty exhaust, ive ordered a new jet to see if i can ajust the carb better as before it would only let loads of petrol in or non at all