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Off idle lag Holly |
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RedSmith 
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Joined: July-20-2015 Location: Asheville, NC Status: Offline Points: 30 |
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 Topic: Off idle lag HollyPosted: July-19-2023 at 9:40am |
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1988 CC Ski Nautique having off idle lag. Any suggestions, please.
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GottaSki
Grand Poobah 
Joined: April-21-2005 Location: NE CT Status: Online Points: 3363 |
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Posted: July-19-2023 at 10:54am |
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Set timing 10btdc
Adjust idle to 700-750 adjust set idle mix screws to strongest idle or vacuum while in gear not neutral (carefully) readjust idle if needed to 700-750 if the idle mix screws are ineffective, or cannot shut down the engine by closing one screw, then your metering block is boogared up, and idle fuel orifice is clogged. Address fuel filtering issue and clean metering block passages. idle fuel orifice is not viewable
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"There is nothing, absolutely nothing, half so much worthwhile as messing around with boats...simply messing."
River Rat to Mole |
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RedSmith
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Joined: July-20-2015 Location: Asheville, NC Status: Offline Points: 30 |
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Posted: July-19-2023 at 11:01am |
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Thanks , on it.
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Jonny Quest
Grand Poobah
Joined: August-20-2013 Location: Utah--via Texas Status: Offline Points: 2978 |
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Posted: July-19-2023 at 11:18am |
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Is the "lag" a hesitation or bog when you go from idle to throttle up? If so, the problem may be in the accelerator pump circuit. You can test by:
- Turn engine off - Remove spark arrestor (you want to be able look look down into the carb) - Remove the throttle linkage socket that connects to the ball on the carb linkage (spring loaded) (The 4160 carb has a primary and a secondary circuit. The primary circuit is the one with the choke plates.) - While looking down the carb into the primary venturis, quickly rotate the carb linkage from "idle" to "full throttle" - You should se a nice, steady stream of gasoline squirt from 2 nozzles into the primary venturis The squirt should be instantaneous with the throttle opening. If the squirt is not instant with the throttle or if the stream is weak, you may have an accelerator pump that needs some TLC. JQ
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2003 Ski Nautique 206 Limited Previous 2001 Ski Nautique Open Bow 1994 Ski Nautique Open Bow Aqua skiing, ergo sum |
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GottaSki
Grand Poobah
Joined: April-21-2005 Location: NE CT Status: Online Points: 3363 |
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Posted: July-19-2023 at 12:25pm |
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Thank you Rob i knew i walked away missing something
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"There is nothing, absolutely nothing, half so much worthwhile as messing around with boats...simply messing."
River Rat to Mole |
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