New Guy, First Boat, 1987 SN2001 |
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JPASS
Grand Poobah Joined: June-17-2013 Location: Orlando Status: Offline Points: 2283 |
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Yes. |
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'92 Correctcraft Ski Nautique
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edwardsjr1
Newbie Joined: August-17-2016 Location: AZ Status: Offline Points: 28 |
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Here you go, its a storage box... with no seat back. Who knows why |
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edwardsjr1
Newbie Joined: August-17-2016 Location: AZ Status: Offline Points: 28 |
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after getting the carb rebuilt I still cant get the boat past 2500 rpm. The secondaries are not opening. ideas?
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spiralhelix
Senior Member Joined: August-06-2014 Location: IL/WI Status: Offline Points: 496 |
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holley 4160? Who rebuilt it? Did the secondary diaphragm get changed? Is the power valve correct? What do the primary jets look like from idle up to 2500 rpm? Is 2500 rpm at WOT?
secondary don't open until there is enough vacuum, so you need to be 3/4 throttle or better i believe. |
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-Spiral
'89 Sport Nautique |
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TRBenj
Grand Poobah Joined: June-29-2005 Location: NWCT Status: Offline Points: 21109 |
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More likely an ignition issue. How does your timing curve look?
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ultrahots
Gold Member Joined: September-08-2004 Location: United States Status: Offline Points: 618 |
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If it still has points I would be checking Dwell. I just helped a local with his and it hit a wall at 2500 and popped and sputtered after that. New points and set dwell. Smooth as glass to 4800.
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edwardsjr1
Newbie Joined: August-17-2016 Location: AZ Status: Offline Points: 28 |
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Thanks Guys, I will be checking the entire ignition system. Ill let you know how it goes.
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edwardsjr1
Newbie Joined: August-17-2016 Location: AZ Status: Offline Points: 28 |
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I moved some things around and installed a new, mechanical 650. I checked the vacuum and its 5 inhg at idle. I read its supposed to be at 17 for a fresh engine. Could this be the reason the secondaries weren't opening on the stock carb?
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phatsat67
Grand Poobah Joined: March-13-2006 Location: Indiana Status: Offline Points: 6147 |
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Yea get me seat info!!! For sure, if its not pulling much air through the front venturi it won't be enough flow to pull the secondaries open. Do a compression test first and see where you stand. If it has good compression do a leak down to make sure the valves are sealing properly. If all that checks you need to be looking for a large vacuum leak. Plug off the PCV when you are testing vacuum fyi. |
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halfnelly
Senior Member Joined: January-14-2013 Location: Maitland, FL Status: Offline Points: 253 |
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After you're done testing, be sure to replace that automotive carb with a marine specific one so you don't turn your engine compartment into a bomb. |
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phatsat67
Grand Poobah Joined: March-13-2006 Location: Indiana Status: Offline Points: 6147 |
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Good call, also you need a braided USCG approved fuel pressure line from the pump to carb. Would also probably ditch the fuel pressure gauge setup.
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ScottZ
Platinum Member Joined: January-20-2004 Location: Clanton, AL Status: Offline Points: 1143 |
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I have a deluxe stern seat that came out of a 1985 Ski Nautique I will sell.
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Scott Zuelzke
Lake Mitchell , AL 1984 Ski Nautique 1972 Skier |
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KENO
Grand Poobah Joined: June-06-2004 Location: United States Status: Offline Points: 10646 |
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So.............what do you have for an ignition system ? Points? electronic conversion? If you have points, maybe you should read this about the missing spring the missing spring What's the firing order written on top of the wires at the distributor cap? |
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edwardsjr1
Newbie Joined: August-17-2016 Location: AZ Status: Offline Points: 28 |
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timing was off. Engine seems to be running perfect now. I still haven't lake tested.
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