7 replies to this topic

[simplyminis]

just bought a mini auto e reg 998

it has twin su's fitted drives a bit lumpy but thats down to the set up

my question is

whn i put it in drive it changes gear very quick also it doesnt kick down

is this due to the carbs?

[TwinCarb]

Check the kick down bar (guv control bar) on the back of the carb is adjusted properly, that may be causing the problem.

[Dan]

I would suspect that whoever fitted the twin carbs has done a poor job of adapting the kickdown system onto the throttle. I don't think twin carbs were ever a standard fit on any car with a transverse A series suto box so whatever is there will be home made. If it all moves properly and is secure then it will just be down to adjustment though.

[simplyminis]

im going to put a standard carb back on anyway

why is it changing gear so quick

[TwinCarb]

My kick down bar was catching the exhaust LCB so might be worth checking that.

[mikeredshaw]

Hi

I've got a B reg Mayfair and when I got mine I was surprised at how 'sprightly' it changes both up and down.

It seems to want to change a bit faster than you would if you were changing manually.

But - I just got used to it and actually just think of it now as one of those quirks which make you smile when you drive it............ well when it's all back in one piece that is!

[kalkat]

Yes - the kick-down control rod will need adjusting, and probably modifying. It's important to realise the geometry of the twin carb setup is different to the single. My auto has twins and not only did I have to shorten the rod, but also put a 'set' into it to get the positionig correct.

When adjusting the kick down rod,there's a hole in the operating bellcrank that lines up with a hole in the back of the gearbox casing - use a 1/4 (6mm) drillbit to line up.

Emma

[MRA]

It chanfges gear quickly because you are not holding the governor mechanism open, and quite basically it is driving like you are on part throttle

As Emma says use a 1/4" rod about 1 or so long will do this positions the mechanism ready for adjustment...... however you really need to review this section in the Haynes or other workshop manual as this is one of those jobs on an auto that is covered

You need to have warmed the engine up, ie operating temperatures, this is to get it off choke and to adjust the throttle to get the correct tick over.... read all about it it will make sense.. page 148/9 Haynes manual (blue one that is)

Edited by mra-minis.co.uk, 19 October 2009 - 06:02 AM.