16 replies to this topic

[mercenary62]

no matter how much I adjust my hif44 it always runs very rich ,ive tried for days turning the mixture screw out and in to no avail plugs are always sooted up black as hell , also when I get a smooth idle it lasts for 5 minutes then stalls out , time for a new carb as im getting well hacked of with it now  any ideas b4 I buy a new or reconditioned carb cheers

[unburntfuelinthemorning]

The mixture adjustment mechanism is mechanically very simple.  Take the dashpot and piston out then observe the jet whilst you adjust the mixture screw.  If you can't see the jet moving up and down then something is broken but it won't be anything complicated or hard to fix but you'll need to remove the carb and have a look in the float chamber to see what's going on.  If the jet does move then your problem isn't with the mixture adjustment mechanism.

[dyshipfakta]

Do you have the right needle/ is the needle worn out?

[mercenary62]

Do you have the right needle/ is the needle worn out?

could be worn out mate  il have a look when I get  time cheers

[mercenary62]

The mixture adjustment mechanism is mechanically very simple.  Take the dashpot and piston out then observe the jet whilst you adjust the mixture screw.  If you can't see the jet moving up and down then something is broken but it won't be anything complicated or hard to fix but you'll need to remove the carb and have a look in the float chamber to see what's going on.  If the jet does move then your problem isn't with the mixture adjustment mechanism.

 

yes it moves up and down mate il need to look into it further

[mercenary62]

wont even fire up now got plenty sparks at plugs but seems fuel aint getting through , fuel pump is pumping so at least that's ok , maybe float is sticking ,jees you gota love these little cars lol,

[KTS]

..are the plugs wet ?  maybe the float valve is stuck open causing overfueling..

[mercenary62]

..are the plugs wet ?  maybe the float valve is stuck open causing overfueling..

no mate there dry

[mercenary62]

carb now in bits will order new  float valve ,ive also had a look at carb needle which is AAA? is this the right needle for 1275 metro engine  with lcb no other mods other than kn filter in std airbox

Edited by mercenary62, 05 January 2020 - 08:45 PM.

[mercenary62]

Do you have the right needle/ is the needle worn out?

needle fitted is AAA mate just got the car but  think its running wrong needle

[71Green-Clubby]

try  BDL ,    I  have found it useable in most  pretty standard 1275 with lab and  k&n and was standard with mg1275's

[bpirie1000]

Have you checked for any other leaks?
Replaced any gaskets recently?
Could be drawing in excess air at wrong time/ place

[mercenary62]

Have you checked for any other leaks?
Replaced any gaskets recently?
Could be drawing in excess air at wrong time/ place

yes checked all intake joins think its the AAA needle that's fitted in the hif44 should be bdl im sure

[MiniMadRacer]

Personally I wouldn't change the needle without changing the jet too. Both do wear and quite rapidly with the "bias" spring on the needle. usually means the needle and jet end up with a flat bit, and hence no longer round. This pushes the needle towards the engine side more and allows fuel to "leak" past the back of the needle. (hope that waffle makes sense)

[beardylondon]

Yes BDL needle for 1275cc with LCB