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11-11-2014, 03:27 PM
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#1
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Veteran Member
Join Date: Jun 2010
Posts: 96
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Port side engine won't advance past 1800rpm
Took my 1966 Californian out today anticipating a good run on flat seas to "Blow" her out. Got to the end of the jetty and started advancing the throttles. She has twin early carburated 350's. Starboard advanced fine. Port side would not advance past 1800/1900 rpm. It felt as if someone was holding the propeller. The engine just felt bound up. Pushing the throttle past 1800rpms would only generate a notable resistance and a rumbling/vibration type of sensation. With the transmission out of gear the engine freely rev's as high as you want to push the throttle. Tranny problem? Older Velvet Drive model 71 I believe. Never experienced this before.
Thanks
Jim
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11-11-2014, 03:40 PM
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#2
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Senior Member
City: Portsmouth, NH
Country: United States
Join Date: Nov 2014
Posts: 169
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I would probably start with pulling the plugs to see what they look like. It would be an obvious indicator as to running rich or lean. Rich would probably be more noticeable with smoke and smell. What type of fuel setup does this have? Change filters to see if you get a noticeable improvement.
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11-11-2014, 05:31 PM
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#3
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Guru
City: Campbell River
Country: Canada
Vessel Name: Okisollo
Join Date: Apr 2012
Posts: 646
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Possibly something drifted in and fouled the prop? net? rope? even a kelp ball?
Ted
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11-11-2014, 11:17 PM
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#4
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Guru
City: B.C.
Country: Canada
Vessel Name: Island Pride
Vessel Model: xxxx
Join Date: Oct 2007
Posts: 2,506
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First things first, check for prop fouling. A plastic bag, rope or similar will do that.
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11-12-2014, 05:51 AM
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#5
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Guru
Join Date: Oct 2007
Posts: 19,837
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If the engine is fitted with a 4bbl carb , some open the secondaries with a vacuum method.
Could just be the secondarys are not being opened.
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11-12-2014, 02:53 PM
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#6
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Guru
City: gulf coast
Country: pinellas
Join Date: Jun 2014
Posts: 2,817
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check prop, check prop, check prop
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11-12-2014, 11:02 PM
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#7
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Veteran Member
Join Date: Jun 2010
Posts: 96
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Will swap carburetors between port and starboard engines. Will change out fuel filters and check counter weights in the distributor. Test run will have to wait until Sunday.
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11-23-2014, 11:03 PM
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#8
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Veteran Member
Join Date: Jun 2010
Posts: 96
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Swapped carbs between engines. Replace fuel filters. Fair amount of water. Bad gas around here lately. Test run this morning. Ran flawless 2700rpm 23knots, 19 mile round trip run.
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11-23-2014, 11:20 PM
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#9
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Guru
City: Hotel, CA
Country: Fried
Join Date: Sep 2011
Posts: 8,324
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Sounds like you got it 
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Craig
It's easier to fool people than to convince them that they've been fooled - Mark Twain
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11-24-2014, 04:24 AM
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#10
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Guru
City: Sarasota,FL/Thomasville,GA
Country: USA
Vessel Name: Steppin Stone IV
Vessel Model: Marine Trader Kelly Trawler 46
Join Date: Jul 2013
Posts: 1,792
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Jclays glad to hear you had a good run
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11-24-2014, 06:50 AM
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#11
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Guru
Join Date: Oct 2007
Posts: 19,837
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Bad gas around here lately
NOPE!
Bad gas is the result federal requirement to dump ethanol in the fuel.
It picks moisture out of the air in your fuel tank, as well as reducing mileage by its content percentage.
Solution is to store with bare minimum fuel in tank , and fill the tank at the first boating outing.
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