Qick question,

If I want to lean my mixture on SU, looking from above with carby on car, I turn the big nut at the bottom of the jet anti-clockwise - yes?

lean is anti-clockwise

Thanks

so when its leaner, its more economical???

and clockwise slightly should be a lil richer, and thus more performance??

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1978 Leyland clubman S.
998cc

my recent observations from playing with mixtures indicated that a too lean mixture will give you no power down low....to the point where you can hardly take off without riding the clutch a lot. A mixture that is too rich will feel powerfull, but possibly foul your plugs, cause excessive fuel comsumption and/or saturate your bores with petrol and cause premature wear.

Finding the right mixture is quite important!

Reason I ask is, I've put on my 1.75" SU which was tuned on 1275, on my 998. 50k's on the hwy the other day chewed half a tank, so I'll lean it out a bit I think....

1.75" is too big for a 998
1.5" is as big as you want to go IMHO

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Too many cars, and too little time.

AND the needle will definitley need changing!!!

ive got 1.5 SU and 998 engine.

free flow air. extractors.

what needle would do nicely for me??

i think the winSU told me to use a AAA.

but is that something i can just go to mini craft and get. or do ausies use different codes?

cheers

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1978 Leyland clubman S.
998cc

Yes I know 1.75 is too big, but I wanted to fit extractors to free the exhaust up a bit, and this carb was already bolted up nicely to an alloy manifold and has been rebuilt. No idea what needle it has, my mech tuned it with a file!!! Which is why I'm just going to experiment a bit with main mixture. Not worried about low speed torque (which is what theoretically suffers - not that I've noticed) as you have to rev its tits off to go anywhere anyway....

K-Bar, i would be looking at an ABD needle for the 998 like yours. Mine is similar - exhaust, LCB, alloy inlet manifold and K&N and i have made up an ABD needle for it (which i had to slightly tweek to richen it in certain points). ABD is a good starting point though

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Mini - The Wizardry on Wheels!