close to stalling on idle... missing high revs

[coleman262]

well as the title suggests the mini will almost stall on idle, (ive just changed the manifold gasket, spark plugs and coil) as the manifold was leaking, and the coil was mullered..

it had this problem since the manifold was leaking but since i replaced its still doing it but 10x better as its driveable...

do you think it could be the mixture? as its never been set since the 2" exhaust and lcb was put on there....

[MiniGT5]

Have you tried to richen up the mixture?

N.

[coleman262]

ta for the quick reply

and no not yet, will try that tomorrow, getting dark out there now and the neighbors children are in bed

is that a likley cause for the above symptoms then?

[Stephen]

It'll need a proper rolling road set up to get any benefit from the bits you've fitted

[Miniböttcher]

Fuel mixture is the last thing to try. Make sure all you ignition side of things are in good working order. Check your tapet gaps. And also timing spark plug gaps. Have you got the right coil. There is 1 for points and 1 for electronic ignition. All these things will help. Make sure you have no air leaks around your carb. And check there is no spindle play in your carb. Once that is all sound then you can set the fuel mixture
A 2" bore exhaust meanng from lcb to back box will be too big for you engine. Does not matter much about the tail pipe it's just the bore oftbe system that matters. Don't go any bigger than 1" 3/4. Any bigger and you lose back pressure and power.

Have you got a k& n. If so you basically have a stage 1 and you may need a different needle and a set up on some rollers.

[coleman262]

no dont have a K&N just the zorst... i know its wrong it was on there for abit of a laugh going top invest in a maniflow 1.75" soon.. not too bothered on the whole power thing for the minute anyway but tappets needs to be done, and its the right coil its for an unballast ignition system

[MiniGT5]

Sound like you just need a good tune up.

N.

[Miniböttcher]

what i mean with the 2" exhaust is that, it will make your engine run like cr*p, as ther will be hardly any back pressure

2" bore exhaust one one best for highly tuned, engine , 1380 and above normally around 100bhp to get ant gain out of it

most of the things i have sugested you can do at home, but i would eather put the standard exhaust back on or get a 1.75" sooner rather than later.

[Stephen]

It doesn't make that much difference ^

Mine had a 2" system for years and ran well

[monkeyjim]

I doubt the carb needle would be to happy with the 2inch exhaust .
If you are not bothered about power why bother with the exhaust in the first place ?

Sure the others will agree that with the spec of bits you have a standard 998 engine using the standard fuel/exhaust system set up properly will run better .

There is only one way to go if you dont want the standard exhaust etc and that is a Minispares centre stage 1 kit .
A properly developed kit with the correct parts, ie inlet and exhaust manifolds , air filter , a carb needle matched to the uprated parts plus a fitting kit .



As Stephen says it will need setting up properly on a rollling road.

You dont say what carb needle , air filter or inlet manifold you are using ?

[mk1morris]

i just done a engine swap for a club member and had the same problem but it was the servo had a leak so in turn the vacum hose was drawing air into the manifold causing a lumpy idle and near staling

obviously it could be a number of things but cheak for leaks and split pipes etc first always try the simple things first

[rallywhite]

talk to minihaven, shawn, he is ggod at sorting out this sort of problem, send him a message, i am sure he will help,

[coleman262]

i did have a leak between the manifold and head, thats sorted and its 100x better, however its really rough on start up, plugs indicate mixture is ok, do you think it might be the headgasket leaking? it dosent use water, but it starts up on what seems like 3 cylinders then when it warms up its ok

[MiniGT5]

Have you checked the spark plugs one could be degrading... or another electrical component that is degrading.

N.