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Old 07-10-2017 | 10:33 PM
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Originally Posted by GPM
Just curious, and have no clue, would that motor ever see vacuum with a Roots style blower
the answer is yes.
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Old 07-10-2017 | 10:36 PM
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was this 502 origionally a 502 mag,hp500 or?
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Old 07-10-2017 | 11:47 PM
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you sure its flooding out, and not leaning out? Does is sneeze/backfire thru the carbs?

I'd hold off on calling Nickerson. Best to do that when you get your tax refund in the spring. Youll need that, and a few months to get the carbs dialed in after he butchers them up.
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Old 07-11-2017 | 01:03 PM
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Originally Posted by TruxtonFox
502 with 10-71 blower/intercooler twin 750 carbs on top. Jet size is 74/84 with 4.5 Power Valve. Set timing on stand, installed in boat and when in gear at 2800-3200 engines will flood out. PV is not boost referenced. 7 psi at the regulator. A1000's feeding aeronotive regulators....I'm no carb expert and am thinking my PV are set to low? Any help is appreciated
did you reset the floats when boat was in water? cause I'll bet if ya did it on level ground ya might have a couple high ones.. also are the cabs inline or sideways mounted?
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Old 07-11-2017 | 06:02 PM
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You fouling plugs at that rpm? Also what plugs are you running?

i would take that tax refund though and put towards some larger boost referenced carbs. 10-71's with 750's? Just a thought. With the 088's you may not see a lot with lot of work or aftermarket replacement.

Im betting PV size.

Last edited by getrdunn; 07-11-2017 at 06:11 PM.
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Old 07-11-2017 | 06:28 PM
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Nothing like having an OP disappear for a bit to answer some questions.
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Old 07-11-2017 | 08:11 PM
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Sorry guys, wasn't getting any email alerts. For sure flooding out, set needle and seats with boat at rest in the water. 100% sure it's flooding, plugs are wet. As I accelerate to get onto plane and hold at 3k the boat runs there for 10secs or so, slowly lose rpm and then motor does. Blowers are obviously way to big for the 502's, my thought was the blower was pulling the pPV's open to soon and flooding it out.
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Old 07-11-2017 | 08:11 PM
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Carbs are sideways mounted
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Old 07-11-2017 | 08:13 PM
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Originally Posted by mike tkach
with non boost referenced carbs i use a 9.5 or 10.5 power valve.how far out are you idle mixture screws?
2 1/4 turns out, idles perfectly, will run up to 4000 with no load no issues, soon as you put load on it she floods
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Old 07-11-2017 | 09:33 PM
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What 10-71's you have and how fresh are they? Just curious. I would have your carbs looked at and gone through by speed shop per your application. You decide to downsize to fresh tbs 8-71's let me know. Regardless what way your u go I'd definitely have a good trustworthy carb guy check your carbs out.

Last edited by getrdunn; 07-11-2017 at 09:36 PM.
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