i have a a+1293 with a bit of work done and a 45mm weber i have changed the plugs and it has the standard dizzy in it it backfires and carrys on like a mad woman shitting at 4000rpm plus if anyone can help with any ideas it would be appreciative

nothing wrong that

_________________

there is something wrong because im used to alot more than that

check points gap and change dizzy cap and leads.

_________________
1974 Moke - 998cc
76 Clubman B16a2 Vtec AWD Turbo 12.9@105mph
https://www.youtube.com/watch?v=V9PW49e1hYs

sorry should have said it was a electronic dizzy

Have you checked you're ignition timing?

I'm assuming this has just 'happened' or have you made any changes right before it started? If so, what?

Matt

it went to the mechanics to get a few jobs done and came back like that

Is the fuel pump able to keep up supply to the Weber? Maybe its starving?

_________________

http://www.youtube.com/user/Hanras

Hmmmm - mechanic trustworthy - I ask as I have had mine returned with nearly 80km over what I had on it when I dropped it off and had a sound thrashing at the hand of the so called "professional".

If trustworthy - sounds like they have mucked about with the advance or the jetting(guesstimation...lol)

Hooroo

_________________
Rob Forsyth
Miniot!!

check fuel feed rate, should pump at lease one litre per minute, if it doesn`t then maybe blocked fuel filter, squashed/kinked fuel line, or pump could be sad

plenty more things to check like sticking carby piston, etc etc etc

do the fuel volume check first tho & then go from there

_________________
No offence intended here but--> anyone writing a book about minis 30 years ago may not have experienced such worn or stuffed-with components as we are finding these days.

You should put your heart & soul into everything you do.

fuel pump is a facet pump mounted on the rear subframe they did have the engine out to fix oil leaks and second gear

I thought those noisy pumps only supplied like 2-3psi? I wouldnt of thought that would be capable of supplying a weber with enough fuel? My twin SU's needed a rotary vane style pump which puts out around 5psi i think. The noisy new facet pump couldnt keep up....

_________________

http://www.youtube.com/user/Hanras

Fuel pressure and fuel volume are two different things.
You can have a 10psi pump that will not have the output volume to keep the carby full. But you can also have a 2.5psi pump that will empty the tank in minutes if a hose splits.

timing. Have you checked it?

start with the easiest thing first

take your plugs out and check them

check your timing.