hey people, i have a 1970 mini k, its got a 1275a+ metro turbo engine, hif44 carb and elec dizzy (lucas....eeergghhhh)
anyways it has been building up enough carbon on cilinders 1 and 2 to go through bp6es plugs. this happens once a month. (handy hint, if a plug has heaps of carbon on it just grab a lighter and burn the end of it...get some more use out of it)
its running 14deg advance on the dizzy, i use only bp 98 octane fuel, tappets are set at 14thou cold. its been using more fuel lately also.
i think its a worn needle in the carb...because it smells quite rich at idle but doesnt feel great at top end...doesnt really want to go much faster then 80mph. also now at about 5000rpm theres a bit of smoke coming out the back which never used to happen.
any help or advice would be appreciated.
cheers
geoff

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real men race downhill - keiichi tsuchiya

Goto bp5es and give that a go, and don't use your choke so long at start up. This will probably sort it. Unleaded fuel needs hotter spark to burn, hence why yours are carbonising. Other opinions to follow.

Cheers

Aaron

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i dont have a choke cable, never worked and never need it, always starts up first turn. i have heard about using hotter plugs but i didnt know unleaded needed hotter plugs. cheers

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real men race downhill - keiichi tsuchiya

yep, hotter plugs first, see how that goes.. then get your car tuned

if you have never used a choke then your carb is more than likley running rich. Don't know too many people running SU's that don't have to use a choke to start it when cold and tuned properly.

Cheers

Aaron

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I couldn't start either of my Mini's without a choke!!!

Yours would have to be too rich if you can start and drive without a choke!

I agree about the choke thing...

But why is it only running rich on 1 and 2 generally as I understand if it is going to run rich it is on 2 and 3 cause of siamese ports issues etc. Maybe there is an air leak? I don't know

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Roads need more corners
A Deluxe(CG13DE), 2 Clubbies(998 and 1275) and 2 Morris 1100Ss

cheers for the replys, ok so lets say i start running 5es plugs, how am i going to takle the running rich thing? i have heard that the only way of adjusting hif44's is changing the needle....? also is this really bad for my engine?
you know that feeling when you just want your mate to be healthy, thanx for your help guys

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real men race downhill - keiichi tsuchiya

there is a screw but dont member where it is
makka

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Anonymous moderation means the agro that is built up towards the mods isn't aimed at an individual (fewer "Makk" attacks). Less stress for mods means less moderator "retirements".

take it in to a good mini place, they should be able to sort you out in half an hour.

Mine doesn't need a choke to start either, just let the fuel pump work for a few seconds and she starts first time. It's probably more down to the local climate more than running rich, by the time I normally need it it's already around 20+ degrees

Quote: the Mini engine is more like four single-cylinder engines than a four cylinder engine

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"Show me the Mini!"