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How do I cure the sudden cutting out wnen the throttle is released of a 1956 Austin a50 cambridge

Replacing the diaphragm and its made no difference.

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  • Leigh Bishop
    Leigh Bishop Dec 01, 2014

    check the thread on the throttle stop screw replace if worn and slipping



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Adjust the carburetta slow running screw

Posted on Dec 01, 2014


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Motorbike backfires when throtle taken off and motorcycle slowing down

Defective air cut diaphragm on side of the carburetor (sticky or leaking air through a hole or tear). replace the air cut diaphragm if damaged. You could also have leaking muffler connection or head pipe o-ring exhaust gaskets . This would allow oxygen into the exhaust , igniting unburned fuel , causing popping or back firing. Replace the exhaust gaskets and seal up the exhaust.

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I have a 1980 poulan 4200, starts and runs, but no power and 'chugging' when throttled. replaced fuel line, rebuilt carb, no exhaust obstructions, compression is okay ~130psi what's next? Dan

Air cleaner may be plugged. This sounds like too much fuel going into the engine. When you serviced the carburetor, did you replace the diaphragm in the lower chamber and check the needle valve that the diaphragm operates? Did you clean or replace the fuel filter in the tank? If everything has been taken care of, turn both jet screws CW to stops (lightly), then back each out CCW 1-1/2 turns. Start the engine and allow to warm up. Pull the throttle full on, and turn H jet needle CW until the engine starts to speed up. Proper final adjustment is when the engine 4-strokes, but immediately 2-strokes when cutting. Release the throttle and adjust L jet needle CW so that the engine idles fairly well, but will allow the engine to 'follow the throttle'. Adjust idle speed screw so that the engine continues to run, but the chain does not try to turn. Hope this helps!

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Where is the fuel pressure regulator located on a 1996 jeep grand cherokee, laredo, straight 6 cyl.?

it's under the throttle body


Fig. Fig. 1: TBI fuel pressure regulator

  1. Remove the throttle body assembly from the vehicle as outlined in this section.

WARNING To prevent spring pressure release, hold the regulator housing against the throttle body while removing the mounting screws.
  1. Remove the three retaining screws that hold the pressure regulator to the fuel body.
  2. Disassemble the pressure regulator assembly. Note the location of the components for reassembly. Discard the gasket.
To install:
  1. Install a new gasket and the regulator assembly. Tighten the three retaining screws.
  2. Install the throttle body assembly as outlined in this section.
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Stihl model f545 will start but will not throttle up

Fuel starvation - 'lean fuel' condition
Basic things to check:
1) spark plug
2) spark arrestor in muffler
3) fuel lines and tank filter
4) turn adjustment needles out (counterclockwise) 1/4 to 1/2 turn
Chain Saws:
5) check impulse tube and intake boot for cracks or leaks
*if all of the above are OK and/or do not improve performance then:
Remove Carburetor
6) replace gaskets/diaphragms
a) use a spray carb cleaner to clean jets, holes, and body of carb
b) fuel pump diaphragm goes against the carb body,
then the gasket towards the outside
c) metering gasket goes against the carb body,
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Poulan Pro 220 saw starts & runs fine when finger on throttle, will not stay at idle. Rplaced plug & same issues.

All you need to do is try to adjust the throttle idle speed or else a cheat would be to tighten the cable which means the cable will be pulling very slightly the throttle which means it will remain running when u release throttle.

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We have an an Infinity DE filter. It's blowing DE back into the pool. We've replaced the filters.

Most likely the "fingers" inside the filter housing are worn out and causing the DE to blow out the return line to the pool.

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I need more information. By "no throttle response" what do you mean? The engine will not rev or it just doesn't respond well when you open the throttle. you could have a hole in the diaphragm in the carb, if it's the stock Keihen CV carb. How many miles on the engine, What type of carb, what type of pipes. I need more information.

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Idleing to high

  1. throttle linkage resting against the carb rubber mount and not closing fully. Unusual problem which was cured by gently filing away part of the rubber mount.
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  3. the metal clamp linking the spindle bar to the accelerator pump rod was rubbing against the carb body, making return to the closed position difficult. Cured by dismantling and reassembling in the right position.
  4. length of the throttle rod was slightly too much. Cured by carefully turning in the plastic couplers and readjusting the holding nuts.
  5. slight air leak through bad gasket. Cured by replacing the gasket.

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