15 replies to this topic

[Blitz-Voodoo]

1275 engine..

Long story short it's been rebuilt & done at least 500+ miles. It has fuel, new plugs, leads etc

On Saturday i can the engine for 15 mins plus just ticking over. When i came to drive it the engine seem to bog down & then a cloud of black smoke pumped out of the rear. It hasn't started since. The plugs are covered in what looks like black gunk.

I've fitted & tried a new coil & nothing.

Any ideas?

[Purple Tom]

Have you checked for a decent spark? What ignition system are you running?

[Pauly]

Black smoke = running rich.

Has the carb been messed with at all, could probably do with being tuned.

The extra fueling could be flooding the engine when your trying to start it, especially if your using choke aswell.

Paul.

Edited by Pauly, 24 November 2008 - 08:47 PM.

[Blitz-Voodoo]

Choke is off.

Carb.. HIF 6 (i think, i'm not that up to date on Mini's)

It needs Rolling Roaded, but i can only do this when it's running lol

[Pauly]

Looking at your profile and if the carb is original it would be a hs4, there should be a nut underneath, I've forgot which way to turn it to lean the mixture but if you have an haynes it explains in there.

Paul.

[Blitz-Voodoo]

Profile?

I new engine has been fitted to the buggy (Blitz)

"FUEL PUMP, CARB WHICH IS THE HIF 6 BRILLIANT FOR SPEED TORQUE AND ECONOMY.

IT HAS THE MG INLET MANIFOLD, AND A QUALITY LCB AND Y PEICE WHICH HAVENT HAD MUCH USE."

I bought the engine off ebay. The above text was taken off the ever popular auction site.

[Blitz-Voodoo]

Looking at your profile and if the carb is original it would be a hs4, there should be a nut underneath, I've forgot which way to turn it to lean the mixture but if you have an haynes it explains in there.

Paul.

There is no spark from the plugs when i turn the engine...

[998dave]

You've changed the coil.

I suspected lack of spark, so suggest you chase this, next guess is that you have electronic ignition?

Now have you tried fitting a random spare plug and resting it on the engine so you can look for a spark.

If you do have a spark then try cleaning the plugs and try again.
If not then go back in sequence, HT leads, dizzy cap and rotor arm, distributor, timing, etc...

[Blitz-Voodoo]

I just don't understand why it was running on tick over for at least 20 mins but when i come to drive it..it pours out black smoke & hasn't started since..

[Blitz-Voodoo]

Yes, i tried a brand new coil.

[998dave]

Could have been ticking over with one cylinder not firing.

This would put a load of fuel into the exhaust system, that'd then burn when you drove it. Causing a big cloud of black smoke.

Hence why you should check the plugs and leads.

Not sure about why it's not restarted, are all of the plugs black? Have you tried cleaning them?

And as above, electonic, or point and condenser?

D

Edited by 998dave, 25 November 2008 - 12:03 PM.

[lrostoke]

HS6 is a 1.75" carb, is the 1275 tuned at all, on later models only Coopers got a 1.75" carb, the rest of the later carb models got the 1.5" actually they got Hif38, and the Cooper got Hif44.

Mini Cooper, 1275 cc, (12A) 1990-on
Carburettor type . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . SU HIF44

Mini Saloon and variants, 1275 cc (12A) 1992-on
Carburettor type . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . SU HIF38

Maybe its overfueling ?? wrong jet for your setup. ?

Also have you cleaned the plugs since they fouled up, they won't start unless you clean them.

[dklawson]

As always, start with the electro-mechanical bits first,
set the valves (cold)
clean/dress (or use new), re-fit and gap the points,
fit a new condenser,
set the static timing
Check the plug wires, cap, and rotor for any carbon tracking and/or cracks (replace as necessary),
fit fresh spark plugs OR sandblast them clean (do not use a wire brush) and reset the plug gap.

Before touching the mixture adjustment, open the carb's float bowl. Make sure the float valve(s) working and that the level in the bowl is correct.

Now try starting the engine.

So, this is a new set of carbs to this engine? What were they running on before and was the displacement similar?

[Blitz-Voodoo]

Could have been ticking over with one cylinder not firing.

This would put a load of fuel into the exhaust system, that'd then burn when you drove it. Causing a big cloud of black smoke.

Hence why you should check the plugs and leads.

Not sure about why it's not restarted, are all of the plugs black? Have you tried cleaning them?

And as above, electonic, or point and condenser?

D

I've checked the leads & plugs.. Should i buy ones? Any performamce ones available?

HS6 is a 1.75" carb, is the 1275 tuned at all, on later models only Coopers got a 1.75" carb, the rest of the later carb models got the 1.5" actually they got Hif38, and the Cooper got Hif44.

Mini Cooper, 1275 cc, (12A) 1990-on
Carburettor type . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . SU HIF44

Mini Saloon and variants, 1275 cc (12A) 1992-on
Carburettor type . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . SU HIF38

Maybe its overfueling ?? wrong jet for your setup. ?

Also have you cleaned the plugs since they fouled up, they won't start unless you clean them.

No it's not tuned.

As always, start with the electro-mechanical bits first,
set the valves (cold)
clean/dress (or use new), re-fit and gap the points,
fit a new condenser,
set the static timing
Check the plug wires, cap, and rotor for any carbon tracking and/or cracks (replace as necessary),
fit fresh spark plugs OR sandblast them clean (do not use a wire brush) and reset the plug gap.

Before touching the mixture adjustment, open the carb's float bowl. Make sure the float valve(s) working and that the level in the bowl is correct.

Now try starting the engine.

So, this is a new set of carbs to this engine? What were they running on before and was the displacement similar?

I just want it running so then Mini Sport can set it up.

[Blitz-Voodoo]

electonic