Hesitatiion

[Booger]

A flatspot from the stop sign on giddyup... AKK!  something in carb? (B&B D6 or whatever)

. Filter isnt old. Spray it down with carb cleaner. Nope. Put on backup carb. Same same ...Timing?

[keithb7]

Remove air filter. With a flashlight Look down carb. Engine off Cycle throttle linkage open a couple times. Do you see a raw stream of gas being injected into the carb? If not pull top off carb bowl. Remove accelerator pump. Re-stretch stretch spring? Is leather cup hard and crusty? Is accelerator pump linkage hooked up to throttle linkage properly?

 

This may help add depth and illustrate the issue:

 

 

Edited October 29, 2022 by keithb7

[Sam Buchanan]

Make sure there isn't a vacuum leak to the distributor advance and/or the advance unit hasn't failed. Could also be something going on with the centrifugal advance in the distributor.

Edited October 29, 2022 by Sam Buchanan

[Booger]

6 hours ago, keithb7 said:

Remove air filter. With a flashlight Look down carb. Engine off Cycle throttle linkage open a couple times. Do you see a raw stream of gas being injected into the carb? If not pull top off carb bowl. Remove accelerator pump. Re-stretch stretch spring? Is leather cup hard and crusty? Is accelerator pump linkage hooked up to throttle linkage properly?

 

This may help add depth and illustrate the issue:

 

 

The accelerator pump plunger ring has been known to dry out with the ethenol gas. Hope its the first and not the later. Last I looked 40# of vacuum

[Booger]

Accelerator pump plunger gasket replace om B&B D6. YES!

[Booger]

moral of the story ethnanol gas eats up stuff

[Sniper]

Leather cups do not like going dry, ethanol or not.  If you can find a modern synthetic rubber/silicone cup that would be the best solution.