hi lads , can any one help me . ive just had my head gasget done, now its usein alot of petrol. can any one tell me if i screw the mixture screw rite down ,how many turns do i turn it back up? or any other idas? THANKS

Exhaust analyser.

You need an exhaust analyser. I use a Halford 'Gunson' tester. Set the exhaust gass to +/- 1.5%.