Single carb vs single carb PER cylinder

Fast Eddie · Jul 5, 2025

I know we often debate single vs twin carbs on Nortons, but WTF debates do they have on the classic Mini FB page ??

CanukNortonNut · Jul 5, 2025

He would have a heck of a time setting is idle mixture screws for at least 3 of the bank.

Tornado · Jul 5, 2025

That's not a stock head...all mini's had inlet/exhaust ports on the back of the head. There is a video of a similar configured min engine running....

Ha....found the carb kit listed on a popular mini supplier...

robs ss · Jul 5, 2025

He's obviously a card carrying member of the Masochists Club!

ashman · Jul 5, 2025

Wonder if they are all premiers Amals.

robs ss · Jul 5, 2025

Tornado said:
That's not a stock head...all mini's had inlet/exhaust ports on the back of the head. There is a video of a similar configured min engine running....

Yeah - but to be fair, they put the distributor on the front of the engine so that it could have a good regular bath!

ashman · Jul 5, 2025

Well they put Magneto's under Amals on old bikes.

seattle##gs · Jul 5, 2025

ashman said:
Well they put Magneto's under Amals on old bikes.

And BSA had to put a drip pan under the carb so it wouldn't catch fire.

baz · Jul 6, 2025

Fast Eddie said:
I know we often debate single vs twin carbs on Nortons, but WTF debates do they have on the classic Mini FB page ??

View attachment 120617

Looks brilliant
And with unworn slides and bodies a great choice
I also like the mini engines fitted the BMW k100 bike cylinder cylinder heads

Fast Eddie · Jul 6, 2025

baz said:
Looks brilliant
And with unworn slides and bodies a great choice
I also like the mini engines fitted the BMW k100 bike cylinder cylinder heads

Wow, I didn’t know that was a thing !

The things folk do eh ??

johnm · Jul 6, 2025

baz said:
Looks brilliant
And with unworn slides and bodies a great choice
I also like the mini engines fitted the BMW k100 bike cylinder cylinder heads

The K100 heads are the hot setup in NZ too.

hpshooter · Jul 6, 2025

ashman said:
Well they put Magneto's under Amals on old bikes.

And electric starters on MKIII's

Hortons Norton · Jul 6, 2025

ashman said:
Wonder if they are all premiers Amals.

And think what it would cost to change to .105 Needle jets, You could go broke! If they were Premiers.

baz · Jul 6, 2025

Fast Eddie said:
Wow, I didn’t know that was a thing !

The things folk do eh ??

hmmmm not as easy a conversion as I thought https://images.app.goo.gl/yMMzr48mVK7iwAZw6

acotrel · Jul 6, 2025

If a person was a bit patient, they could make and match the needle jets using a flow-meter. Getting them all within the adjustment range of the needles might be a problem. The errors sizes might be difficult to live with.

acotrel · Jul 6, 2025

Fast Eddie said:
I know we often debate single vs twin carbs on Nortons, but WTF debates do they have on the classic Mini FB page ??

View attachment 120617

They look good to me. Better than car stuff.

baz · Jul 7, 2025

acotrel said:
They look good to me. Better than car stuff.

Lots of people fit bike carbs on cars
But they are generally CV carbs
With the advantage of tuning each carb per cylinder

B+Bogus · Jul 7, 2025

With no air slides I'm guessing it's 'pop the bonnet and give them all a tickle' time?

acotrel · Jul 7, 2025

Years ago I met Baldo Meli. He used to work for the Triumph factory, and got a 12th in the Senior IOMTT in about 1948. - He said 'SU carburetors are good'. I thought was insane - but what would I know ? I found out that when tuning carbs, we need to figure-out what all the bits actually do - when they work and their effect on performance. Richer mixture gives more calories, but if the air-fuel mixture is not optimal for the situation and the gearing we use, performance can suffer. A single carburetor is easier to get really right than twin carbs.

This video might be interesting -

Onder · Jul 8, 2025

Hmm. No air filters. Tsk tsk tsk.

Single carb vs single carb PER cylinder

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