carb problem

[d absher]

engine idles rough and dies when you give it gas after carb rebuild any ideas ? thanks

 

[Scott Danforth]

Re: carb problem

make sure that the accelerator pump is working. with the engine off, have someone looking down the carb. pump the fuel, you should see fuel squirt. if it doesnt, you have a blockage in the accelerator circuit.

the rough idle is most likely dirt in the idle circuits.

 

[TwoFish]

Re: carb problem

More information on year and model would help. What was done to rebuild the carbs?
Have you done a link and sync on the motor after the rebuild?

My 1998 carb doesn't have an acceleration circuit. No mechanism there to pump fuel. Only vacuum from the engine. Earlier models may have them. I have seen them in Auto carburetors.

 

[d absher]

Re: carb problem

More information on year and model would help. What was done to rebuild the carbs?
Have you done a link and sync on the motor after the rebuild?

My 1998 carb doesn't have an acceleration circuit. No mechanism there to pump fuel. Only vacuum from the engine. Earlier models may have them. I have seen them in Auto carburetors.

it is a 1973 chrysler 85 hp i took carbs apart soaked in cleaner replaced needles and seats and gaskets sis not check or adjust floats b 4 rebuikd it would run just hard to start and on,y run about 3/4 throttle im about ready to give up on it
thanks for help

 

[Scott Danforth]

Re: carb problem

cleaning is more than just soaking. its soaking, running wires thru the ports, and blowing out with compressed air.

it sounds like you may have a leak somewhere. did you sync the carbs?

 

[TwoFish]

Re: carb problem

It can be frustrating at times. Stick with it though.


I’m not familiar with this motor. I tried to find a diagram of the carburettor online but the closest I could find was a 1977 85. It had a choke plate at the throat of the carb, then the venturi tubes and then the throttle plate. Does this sound like the setup?

As mentioned compressed air can help. Be careful poking around with wire in the ports as the metal the carbs are made of is soft and easily damaged.

Setting your float level is important especially as you have replaced the needle and seat. Too low and the motor will run lean and too high it will run rich or the carb will overflow.

Do the throttle plates sit horizontally in the carbs when you push the control lever to full throttle?

Do the choke plates close properly when the choke is engaged and do they sit horizontal when not engaged?

Was the motor running well before the carb rebuild?

Compression, spark and fuel are needed for the motor to run. Usually checked in that order unless there is an obvious problem.

Have you checked compression and spark? No point spending time on the carbs if the problem is else ware.

Good Luck

 

[jerryjerry05]

Re: carb problem

All Chrysler and most Force carb are basically the same.
No accellerator pump in most outboard carbs.
First post in the Force Forum is a lic by FrankA called a linc and sinc.Do this.
Cleaning the carbs,how dirty were they when you started?
If the bowls were crusty inside??? Then the welch plugs need to be taken out and the passages cleaned.
You'll need carb kits.

The air screws set right?
In till they bottom out,then out 1 and 1/16 turn.
Then adjust from there.
The linkage connected right?All inner buterflys MUST move at the same time.J

 

[d absher]

Re: carb problem

All Chrysler and most Force carb are basically the same.
No accellerator pump in most outboard carbs.
First post in the Force Forum is a lic by FrankA called a linc and sinc.Do this.
Cleaning the carbs,how dirty were they when you started?
If the bowls were crusty inside??? Then the welch plugs need to be taken out and the passages cleaned.
You'll need carb kits.

The air screws set right?
In till they bottom out,then out 1 and 1/16 turn.
Then adjust from there.
The linkage connected right?All inner buterflys MUST move at the same time.J

b 4 rebuild engin hard to start and would only run at 34 throttle would cut out and die at wot that was reason for rebuild
now running worse i set idol screws baxk whare thay where be 4 i took them apart i think the floats are out of ajustment
gonna try one more time hope i have better luck this time

 

[bfconstruct]

Re: carb problem

im new to this how do i start with my own question?

 

[TwoFish]

Re: carb problem

D abasher.

Have you sorted the problem out yet. This thread has come to the top again. Just wondering how you were getting on.

Have you checked the compression on this motor yet?. May not be a carb problem.


bfconstruct.

PM. Sent with instructions.