I have Opel kadett 1.4 1995 model car didn`t want to idle we did set idling jet but now its rev`s is too high. Did service carb in July last year now giving me the same problems.

It could be many things. check the link

https://www.google.com/search?q=Opel+Kadette+1.4.+The+timing+set%2C+starts+but+no+revs

An auto electrician with a pro grade scan tool can diagnose in 20 minutes. Better than guessing and replacing the engine!

https://www.google.com/search?q=mobile+auto+electrician+near+me

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no year told, nor when it last run perfect not told
same answer for 100 years on any otto cycle gas engine made car or motorcycle or scooter.
same., and drives fast too, full power work but idle fails.

well , idle is too rich, as are all carbs this old and never serviced.
when it stalls i bet spark tip is wet with fuel or carbon fouled.

or bad fuel. or caused by bad fuel endless for 100years
ive cleaned like 1000s of carbs in 50+ years. endless. me.
it's only a 150cc engine, and tiny carb. my CB750s old and new.
both had 4 carbs and are tricky and must be synchronized
but your's is a pussyycatt. 1 carb small
causes all.
the float needle is bad causing too high float level.
the jets are bad or wrong or dirty. there may be 2 jets one is idle and bad. but most time not 2, just 1 jet and 1 needle.
the needle can be bad , most are this old and bottom of needle is idle section OF NEEDLE and all worn out and now super rich at idLE SPEED
the air paths inside the body of carb must not be clogged
all tiny air paths. checked and cleaned fully.
that is all I can think off off hand.
my guess is bike is super old.
is bike real honda or this trashy china clones of 80 honda.
no year told nor photo of it so we can ahhhh that BIKE,
THE TANK VIEW IS OMG EASY TO ID.

NOT TOLD , FAILS IDLE HOT AND COLD ENGINE BOTH.
Using throttle grip hold RPM up a tad to get it hot first and see if idle reall fails hot.
first 150cc bike owned ever,?yes
the learn this.
we start with mild choke cold and back it off bit by bit until warm.
the chock has a fast idle features that must not be broken.
back it off slowly for 5 mins. then idle works
some have idle mixture screw on the side or is fast cold idle screw.
the cables are not for idle. ever and are set loose side
a stop screw idle and maybe mixtures idle. tool
depends on year not told if honda mikuni made.

As long as the idle air control valve is working, ( I assume this is what you replaced, I would first check to make sure it is operating correctly), If it is, then Id begin searching for a vacuum leak

you may have a plugged cat. take the o2 out of the Ex. manifold and see if it will rev then

please go to a service point and ask them to increase the
rotations when idling.not more than 800 rpm

honestly i dont know the second one but there is no way its for fuel regulation on high revs ,, maby for inceased idle speed when under loa ,,, ie aircon or all lights and heaters on ,,, to me it sounds as if main jet is blocked in carb ,,,, choke is feeding in fuel in place of main jet ,, ie fuel starvation ,,,,

YOU MUST HAVE OR HOSE PIPE IS OFF AND SUCKING AIR OR YOU COULD TAKE THE IDLE VALVE AND CLEAN IT WITH CARB CLEAN.

check your throttle position sensor and your maf sensor.