510 chokes up, hesitates under acceleration.

Engine, Transmission and related drivetrain.
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bueiz
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510 chokes up, hesitates under acceleration.

Postby bueiz » 07 Sep 2016 11:00

Team, I've been chasing a hesitation issue like a madman. The wagon is choking up under acceleration.

I took the engine from bone-stock and swapped out the OE carb for a Weber 32/36 DGV, new plugs, new wires, Pertronix EIM, Pertronix Coil, I think I timed it right, new mechanical fuel pump, new fuel filter. Still have issues.

I uploaded a video to Youtube, here:
https://youtu.be/Xm5WFdkNiRE

Let me know what you guys think.

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defdes
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Re: 510 chokes up, hesitates under acceleration.

Postby defdes » 07 Sep 2016 15:49

Play in the distributor shaft? It sounds really lopey too.

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zKars
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Re: 510 chokes up, hesitates under acceleration.

Postby zKars » 07 Sep 2016 16:36

Check fuel pressure and accelerator pump function.

Three B's Racing
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Re: 510 chokes up, hesitates under acceleration.

Postby Three B's Racing » 09 Sep 2016 04:57

Like zKars said check accelerator pump function. Look down carb and throttle the carb. You should see a nice stream of fuel shooting into the throat like a good piss behind the garage after a few beers. If that's good then I would pull the top of the carb off and see if the fuel bowl level is correct, if that's good its overly lean and time for jetting oh that should be fun.
"Lastnight the wife said oh boy when your dead you can't take nothing with you but your soul oh "Think"
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bertvorgon
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Re: 510 chokes up, hesitates under acceleration.

Postby bertvorgon » 09 Sep 2016 05:26

Maybe these cutaways will help.

Also, how old is this carb? If not new, check that the "booster" venturi's are tight, specially in the primary. The booster venturi is the thing that goes across the top of the inlet in the primary barrel. They loosen up over time.
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"Racing makes heroin addiction look like a vague wish for something salty" - Peter Egan

1973 2Door Slalom/hill climb/road race / canyon carver /Giant Killer 510
1968 Vintage 3HP Mini Bike
1971 Vintage 13' BOLER trailer

datzenmike
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Re: 510 chokes up, hesitates under acceleration.

Postby datzenmike » 09 Sep 2016 16:12

Chokes up? No. If anything it's not getting enough gas.

Revving in neutral doesn't really put anywhere near enough load on it. Try driving it. Bet it falls on it's face when you add throttle from idle.
"Nissan 'shit the bed' when they made these, plain and simple." McShagger510 on flattop SUs

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toylet
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Re: 510 chokes up, hesitates under acceleration.

Postby toylet » 11 Sep 2016 20:55

Put a wide band on it.. sounds like you have lean condition.

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bueiz
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Re: 510 chokes up, hesitates under acceleration.

Postby bueiz » 23 Jul 2017 13:55

Y'all. This post is very late; but, always check your vacuum lines for dry-rot.

After months of chasing his issue, it turned out to be a vacuum leak. I was on a Weber carb tuning website and the first sentence in all-caps and bold said "CHECK YOUR VACCUM LINES!"

I have obviously learned my lesson.


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