Accelerator pump screw

[echoniner111]

Bike started running bad out of the blue last week so I decided to play around with the carb after checking plugs , I decided to readjust the accelerator pump screw and found there's no change in how she runs from lightly seated to 5 or 6 turns out .

What's this mean , I feel its not good ?

 

[gbspear]

Need to do a quick rap on the accelerator. If it stumbles need to adjust. Setup is 2 turns out.
1.Verify carburetor is set to stock settings:
a- Idle Mixture Screw, 1-1/4 turns from lightly seated.
b- Idle Speed Screw, ½ turn clockwise from
engagement point.
c- Accelerator Adjustment Screw, two turns
counter-clockwise from seated.
2- Start bike, bring to operating temperature.
3- Set Idle Speed Adjusting Screw, clockwise to increase
rpm, counter-clockwise to decrease rpm. Idle rpm range
should be 950 to 1050 rpms.
4- Adjust idle mixture by turning Idle Mixture Screw slowly
clockwise until the engine runs poorly. Slowly turn the
screw counter-clockwise until it runs smoothly—if you
go too far the engine will start to stumble.
5- With engine idling, turn Accelerator Adjustment Screw
clockwise until it lightly seats. Snap throttle open—
engine should stumble. Turn screw counter-clockwise 1/4
or ½ of a turn at a time, until engine responds to throttle
twist with smooth, quick response.
6- Ride motorcycle in various rpm ranges, and then try to
maintain a consistent 40- to 50-mph. If the engine is
popping or sneezing in the air cleaner it can indicate a
lean condition. If you notice stumbling or sputtering it
can indicate a rich condition

 

[BroadBand]

 

[C.A. Jones]

Replace the accelerator pump diaphragm ($13.95) then run a .006" feeler guage through the injector nozzle slot that faces toward the rear of the carb. You'll be good to go. Replace the blue injector nozzle o-ring while you're there. C.A.Jones V-Twin | Custom Builds, Parts & Service

 

[echoniner111]

Thx !!

 

[Little-Boo]

Bike started running bad out of the blue last week so I decided to play around with the carb after checking plugs , I decided to readjust the accelerator pump screw and found there's no change in how she runs from lightly seated to 5 or 6 turns out .

What's this mean , I feel its not good ?

Basically your accelerator pump screw is adjusted so that the bike can throttle when you hit the throttle. If you hit the throttle and the engine stumbles than it is not set right. Turn it all the way in and than out two full turns, snap the throttle if it stumbles turn it out 1/4 turn more and try again you continue to do this 1/4 turn at at time until the engine can throttle with out stumbling or hesitation. Make sure the engine is at normal operating temp. :2thumbs:

Carlos

 

[echoniner111]

Basically your accelerator pump screw is adjusted so that the bike can throttle when you hit the throttle. If you hit the throttle and the engine stumbles than it is not set right. Turn it all the way in and than out two full turns, snap the throttle if it stumbles turn it out 1/4 turn more and try again you continue to do this 1/4 turn at at time until the engine can throttle with out stumbling or hesitation. Make sure the engine is at normal operating temp. :2thumbs:

Carlos

There's no stumble in engine with accelerator pump screw lightly seated or any other point .

There's no adjustment , so I'm asking , is that normal or is it broke .

 

[zenbiker]

Bike started running bad out of the blue last week so I decided to play around with the carb after checking plugs , I decided to readjust the accelerator pump screw and found there's no change in how she runs from lightly seated to 5 or 6 turns out .

What's this mean , I feel its not good ?

if it started running poorly out of the blue, the last place I would look is the carb. These screws don't turn themselves suddenly. You are far more likely to screw it up than help.
There are so many things I would look at before the carb.
Your description of "Running bad" means nothing! In what way is it running poorly? I would look at everything from a dirty fuel filter to a dirty air cleaner to plugs and wires before the carb.
How many miles on the bike? What year? When did you change all of the filters?
You expect advice but tell us nothing.
Come on…some info!
.

 

[squat]

Basically your accelerator pump screw is adjusted so that the bike can throttle when you hit the throttle. If you hit the throttle and the engine stumbles than it is not set right. Turn it all the way in and than out two full turns, snap the throttle if it stumbles turn it out 1/4 turn more and try again you continue to do this 1/4 turn at at time until the engine can throttle with out stumbling or hesitation. Make sure the engine is at normal operating temp. :2thumbs:

Carlos

For others, experiencing a half second “stumble”, can indicate a ‘too rich’ setting! S&S ships their carbs with the accerator pump screw set for ‘easier starting’. That means ‘too rich’ when warm. I turned my screw in (clockwise-leaner) a half turn to get smooth response, out 2 turns from gently tight. Probably best to start 1 turn out, continue 1/2 turn, till you get smooth acceleration. Hard to tell a ‘too rich stumble’ from a ’too lean miss or snort’, but the adjustment is fairly critical, so get it right for passing semi’s and RV’s !