Try the method in the picture attached (how do I attached a file?)

i.e. use a padlock to clamp together the Brake and Clutch pedals. The former owner of my Pickup dato had already modified by welding some plates for the padlock!!

We have datsuns in Kenya - very popular indeed. I will tell you something "you will never find a dead Datsun! Peolple rarely sell their Datos.."

See that one on mine assembled in Kenya in the left of this message...

The radiator water had turned so dirty

I don't see why it should not.

Check out these:

http://www.fuelstar.com/unleaded.html
http://www.motomorini.com/uk/morinisti/espertobenzina.html

Regards

DodgeMan said "If your engine is stock, then do not change the jet sizes away from stock sizes as these are a proven combination."

Which is stock engine? Mine is A12.

There are two vacuum tubes:
1). One runs from the air-cleaner housing to the inlet manifold.

2). Another runs from the ditributor vacuum advance unit to the side of the carburator.

Is this correct?

Yesterday I noticed that the car is so weak on high gears. Recently when I cleaned the carb, I just set the timing to produce spark on 0% when the crack is turned by hand. I do not know if the spark is produced at around 7 degrees on 600 rpm?
Could the lose of power due to retarded spark timing.

Your ideas great.

1). I am not sure if what I see is intantaneous squirt. Just wondering which direction the jet should be facing. Mine has the slanted side facing upwards (it's like a flute tube slashed diagonaly - you know what I mean). The fuel therefore, touches on the Venturi before dripping down.

2). The manifold Vacuum leak is possible because the openning is just around the loose (too free) shaft.

But why does it pick-up when I step on the accelerator SLOWLY?

Lately my 1200 Datsun pickup 1993 has been hestitating and slightly jerking when I accelerate.
It happens both when the car is cold and warm and in the beginning of the acceleration.
Even when I change gear and start to accelerate!
There is a serious lack of power and it is so annoying... sometimes the engine stalls.

I recently changed my plugs, oil, and air/fule filters, battery etc...
Imagine, joining a High-Way and want to accelerate before the approaching cars arrive, there it goes duf duf, hesitate!

I have read many articles on this problem and they say the culprits are:

1). A light stumble only when accelerating from idle could possibly be caused by the idle adjusting screw,
being turned in too far. or

2). The accelerator pump circuit. http://www.theautoist.com/weber_carb.htm or

3). Acceleration hesitation is caused by Vacuum leaks.

Point (1) cannot be my problem, because I have adjusted idling and it's good.

Point (2) might not be the problem. But it is a potential. When I opened up the carb last week-end I made sure the Accelerator Jet squirts a fine spray into the throttle.

I have cleaned my carb many times making sure there is no blockage. One time I put bigger jets (two times bigger that what are there).
The problem disappeared but fuel consumption doubled, and the exhaust pipe turned black. The link above discourages
people from putting bigger jets to cure hesitation.

Could it be Vacuum leak? I suspect this because I realised that the Primary Throttle Shaft has too much free play.
On the contrary, the Secondary Shaft is tighter. Can this be re-built?

What do you guys suggest? I am feeling so bad about this problem.
I do not want to buy another carb if this can be solved.

It is a Hitachi carburator.

I just wondering which part of the carb is the "damper"? I understand you put some oil on it!

Datto, that's wonderful! So resourceful...

Someone send me exploded diagrams of the Hitachi Carb. I have looked for Owner's Manual in English in vain (Datsun 1200 Pickup - see the image).

I would like to know which part is which because mine needs a lot of service...