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Old 05-29-2020, 12:03 PM   #1
95476
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Default Stumble off idle

I have a fresh 59AB that has a stumble on acceleration, like off of stop sign. It idles well and if you give it more gas when it stumbles it runs well. The spot just off idle seems to be the problem.
The motor is brand new
New Stromberg dual 97's on an Offy intake
Isky 3/4 cam
Bubba's dist.
I am thinking it could be a jetting issue but maybe someone else might have a better idea.
Thank you
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Old 05-29-2020, 12:05 PM   #2
drolston
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Default Re: Stumble off idle

Put the 97 accelerator pumps on the winter setting (the further out ball connection) and give that tight engine some time to break in.
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Old 05-29-2020, 10:08 PM   #3
Tinker
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Default Re: Stumble off idle

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Maybe condensor, try it. Might be a new build valve issue also, guides are tight. Run it hard. See if running helps. My new rebuild runs about the same in spring, it opens up later. Considering a fuel jet change but plugs are good. Pull the choke a bit will help till you pass the hesitation. Levels as it heats up which makes sense.
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