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Stage One And Cooper Head. Running Problems.


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#1 Beardy-guesty

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Posted 07 February 2019 - 11:18 AM

i have a mini 998, i have swapped the head for a cooper head and also fitted a stage 1 kit, ( inlet,exhaust and carb spring and needle). 

 

i know i need to set the carb up to make it run properly but i have to put my foot to the floor to start the engine or it will not start.

 

once the engine starts it revs up and i have to switch it off. 

 

i have the su hs6 carb. 

 

is there a way to set the carb up without the engine being warm as i obviously cant run th engine at the moment. 

 

what do i need to adjust to make it run? 

 

thanks 


Edited by Beardy-guesty, 07 February 2019 - 11:25 AM.


#2 nicklouse

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Posted 07 February 2019 - 11:59 AM

sounds like you have totally the wrong parts.

 

the carb is way too big. what needle did you fit?

 

also what head number have you fitted?


Edited by nicklouse, 07 February 2019 - 12:05 PM.


#3 Beardy-guesty

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Posted 07 February 2019 - 12:18 PM

head number is 12G295

and the carb is the standard one that came when i bought the mini and it ran fine. 

 

i fitted the needle that came with the stage 1 kit from minisprt.com 



#4 Hedgey

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Posted 07 February 2019 - 02:07 PM

Are you sure its a HS6? More likely to be a HS4

 

Elliott



#5 nicklouse

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Posted 07 February 2019 - 02:24 PM

as above and which needle is it.
 
please check the carb size and please give the needle info so we have an idea if they are actually compatible/suitable.
 
As te build spec is a fairly common one if it is really an HS4 then checking the needle is right is the first step.
 
and from your words
 

i know i need to set the carb up to make it run properly but i have to put my foot to the floor to start the engine or it will not start.
 
once the engine starts it revs up and i have to switch it off.

it does sound like fueling/air issues.



#6 Beardy-guesty

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Posted 07 February 2019 - 02:42 PM

sorry yes it is the hs4. 

 

and it doesn't say what needle it is, just says uprated. 

 

 

https://www.minispor...5-hs4-carb.html

 

that is the kit i bought 

if that helps 

 

thanks 


Edited by Beardy-guesty, 07 February 2019 - 02:43 PM.


#7 Hedgey

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Posted 07 February 2019 - 03:16 PM

The equivalent stage 1 kit from minispares (different air filters) uses a AAU needle if that helps

 

Elliott



#8 nicklouse

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Posted 07 February 2019 - 04:24 PM

sorry yes it is the hs4. 

 

and it doesn't say what needle it is, just says uprated. 

 

 

https://www.minispor...5-hs4-carb.html

 

that is the kit i bought 

if that helps 

 

thanks 

unfortunately it does not. you will have to pull the needle and read the number. don't ask Minisport what it should be as what they say and what you have are not guarantied to be the same.



#9 Beardy-guesty

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Posted 07 February 2019 - 05:06 PM

could it just need the needle adjusting? 



#10 nicklouse

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Posted 07 February 2019 - 10:52 PM

you dont adjust the needle. the jet height needs setting but again we need to know what the needle is. if it aau then you should be able to get it running.



#11 dyshipfakta

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Posted 07 February 2019 - 11:56 PM

Could also be an air leak a big one

#12 Retroman

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Posted 08 February 2019 - 10:42 AM

As a starting point;

 

The mixture adjustment is the lower nut under the carb where the pipe from the float chamber goes in [has a spring above it]

 

Remove the dashpot [top] from the carb [3 screws]... don't drop the piston or bend the needle !

 

You can then see the brass jet in the middle, the needle on the piston goes in it.

 

Turn the mixture nut under the carb up clockwise so its level with the bridge.

 

Then turn it back down 2 full turns anticlockwise [6 flats on the nut]

 

Before refitting the dashpot piston assembly check the number of the needle...

 

Small screw on side of piston, undo remove needle...number on thicker part at top [very small].

 

When refitting the needle the sharp shoulder needs to be flush with the bottom of the piston

 

That may be enough to get it running but may be miles off, guarenteed to need mixture adjusting and ignition timing setting.

 

POST what number the needle is and go from there



#13 Beardy-guesty

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Posted 10 February 2019 - 12:27 PM

Finally had time to check. Needle is AAV

#14 Retroman

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Posted 12 February 2019 - 07:27 PM

Ok good, AAV could well be a stg 1 kit needle, but as you have a 295 head AAU may be better as its a richer needle

 

Have you tried setting the mixture as above...?

 

Make sure you have oil in the dashpot damper on the carb.

 

I would also be checking the timing as that will help, is it running points or electronic ignition ?



#15 Beardy-guesty

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Posted 13 February 2019 - 02:24 PM

ye i have done the above and it runs. 

 

just bogs under acceleration so going to check into the timing. 

 

its got an electronic ignition 


Edited by Beardy-guesty, 13 February 2019 - 03:51 PM.





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