15 replies to this topic

[minibeefy]

mini city E
B reg
998
KnN
twin DTM

hey guys as you prob all know iv had some problems with my mini lately. iv got it runnin and it drives but its been suffering from lag for a while. if i put my foot down it rumbles for a bit then pulls good.

anyone know why this is?

[Nickh_16]

might need and upgraded needle to get more fuel in i had a similar problem, poot my foot down and got nothing for a few seconds, changed the needle goes much better now

[sazal]

You had it rolling roaded?

[minibeefy]

na havent had it on the rolling road. need the cash to do it. think i do need a stage 1 needle because thats the only thing that i havent done to make it a stage one.

[Nickh_16]

yeah, could cure the problem, did with me, i had the stage 1 needle but because i also had a cooper head the stage 1 needle wasn't enough, so i upgraded again and now it runs like a dreaaaaaaaaam

[minibeefy]

also my engine moves because the bushes have gone. am i right these r the right ones to buy?

CLICKY

[minibeefy]

yeah, could cure the problem, did with me, i had the stage 1 needle but because i also had a cooper head the stage 1 needle wasn't enough, so i upgraded again and now it runs like a dreaaaaaaaaam

does the cooper head give much more power?

is there much modifications needed to fit one?

[JohnGordon]

I know this sounds stupid but have you taken the spacer off the carb assembly? I had to, to fit my piper-cross air filter. This did cause the accelerator mechanism to catch on the inlet manifold (just another thing to check)

[Nickh_16]

the 12G295 cooper head is what i have, it was a straight on job, had it skimmed to get a clean surface first, apparently they're supposed to be skimmed 40thou first to get teh correct compression ratio, but you should ask someone else about that, mine works fine, i think it gives quite a reasonable power gain, mine goes well and pulls through the gears very well, i've never driven a standard 998 so i wouldn't be able to compare i'm affraid

nick

[minibeefy]

I know this sounds stupid but have you taken the spacer off the carb assembly? I had to, to fit my piper-cross air filter. This did cause the accelerator mechanism to catch on the inlet manifold (just another thing to check)

im not sure what spacer u mean, but as far as i know i havent taken anything off.

[Surfbluegarage]

just another thing to check for is your advance on your dizzy mine has failed acouple of times on minis and causes the engine to not pull much at certain revs. test it with a vacumn pump if u can get one and make sure it holds it vacumn if u havent got a pump then take the advance pipe off the carb suck on it and put your tongue on the end if it sticks to your tongue for a couple of seconds its ok.if not ring h+h or aldon or sumone for a new one.

[MiniMonty]

Your exhaust is probably your problem if it hasn't been fitted with all the bits and bobs to marry
it happily to the engine. (i.e. needle/manifold etc.,)
But hang on....
Sounds like you are talking about a flat spot in the engine and that will need tuning out when you get a needle anyway so you could
get a slightly sweeter ride now and a good 'practice' for the tuning you will need to do when you do get the needle.
I'd start with really carefully and precisely doing the valve clearances. Take your time over this
and do it right. (i.e very slowly and carefully). Gap the points precisely and run her down to a nice low idle with the carb screw so that when standing
a few feet away with the bonnet off or open the main sound you hear from your engine is a regular and rhythmic "tick-tick-tick-tick-tick-tick-tick-tick".
Go round the block a few times and get the engine up to temp and see how she pulls.
Go home and do your valves again (they will have moved minutely).
Obviously, before you do any of this look for punctured hoses, bad gaskets etc.,

But, as others have suggested, you probably need a needle and a rolling road to get the most out of it.
by the way - if your exhaust is loud on a 998 you are losing power and speed to the God of showing off.
I prefer being quiet - and first.

Best wishes
Monty

[998dave]

also my engine moves because the bushes have gone. am i right these r the right ones to buy?

CLICKY

Yes those are the right bushes, you'll need two sets, one for engine, one for bulkhead.
I tend to buy mine from Mini-Medics though, very helpful and quick.

If you have the wrong needle then you'll be down on power, and running lean, it's only £10, so get one, fit that, and try setting it up again. Then look at rolling road to get the best.

Changing the head will make things worse until you've got the right needle.

Also check oil in your dash pot while you're at it, and your points and ignition system, plug gaps, point wear, how long ago were these last changed or checked? They're regular service items on the A-series, unles the basics are working right any tuning mods are a waste of time and money...

Dave

[Mart8V]

Agree with Dave- oil in the dash pot is the first and easiest fix! Was having problems with my old HIF38 with a massive flat spot and discovered it was totally dry in there. Sorted out straight away.

[minibeefy]

also my engine moves because the bushes have gone. am i right these r the right ones to buy?

CLICKY

Yes those are the right bushes, you'll need two sets, one for engine, one for bulkhead.
I tend to buy mine from Mini-Medics though, very helpful and quick.

If you have the wrong needle then you'll be down on power, and running lean, it's only £10, so get one, fit that, and try setting it up again. Then look at rolling road to get the best.

Changing the head will make things worse until you've got the right needle.

Also check oil in your dash pot while you're at it, and your points and ignition system, plug gaps, point wear, how long ago were these last changed or checked? They're regular service items on the A-series, unles the basics are working right any tuning mods are a waste of time and money...

Dave

iv only just changed the points and the dashpot has oil in it. guess il need a new needle and a RR session.