su carbs set up.

[crispian22]

Hi all, got a 1973 bgt with the standard Su carbs and am looking for info on setting/tuning the carbs,just had the head off for some polishing/porting/decoke work and want to set the fuelling correctly.thanks.

[todd69]

Colortune, great wee bit of kit for getting the mixture right.

Look on youtube for doing it by ear, guy called John Twist.

http://www.youtube.com/watch?v=ASeMfXfjNpw

[na]

another newer video from John twist - http://www.youtube.com/user/Universitymotorsltd#p/...

of course this and lots more you need to know as an owners is in the owners Handbook (Ref: 0052) - http://www.mgocshop.co.uk/catalog/Online_Catalogue...

[crispian22]

Cheers for the help,I have the early Su carbs on with the float chambers next to the main carb body,non hif as it where.

[Spitfire2]

You'll have HS4 carbs same as on the Spitfire 1500.

Look for carb balancers on Ebay if not happy balancing by ear/with a hose.

I also use a gunsons gastester. Fiddly bit of kit but actually very accurate with practice.

The "lifting pin" technique you will find in Haynes manuals works but I have never really got the hang of it.

[na]

crispian22 said:

Cheers for the help,I have the early Su carbs on with the float chambers next to the main carb body,non hif as it where.

principle is the same plus if you get a copy of the oeners Handbook it's detailed in there

setting the carbs is only one part of the operation and will probably need redoing after a full service when you'll also set up when you set tappets, points and timing - all in the owners Handbook for £8