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    1997 4.3GS with Holley 4 barrel with flat spot on acceleration at 3500 rpm

    I appreciate your doggedness on my behalf! I've got a new 5.0 coming in soon and plan to pull the thermostat tomorrow.
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    1997 4.3GS with Holley 4 barrel with flat spot on acceleration at 3500 rpm

    There were no other numbers I could find.
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    1997 4.3GS with Holley 4 barrel with flat spot on acceleration at 3500 rpm

    the numbers on the horn are 3857046 (volvo pents/OMC number) and below that 75007 and below that 1287. Those last 2 sets of numbers don't seem to mesh with any Holley numbers I could find.
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    1997 4.3GS with Holley 4 barrel with flat spot on acceleration at 3500 rpm

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    1997 4.3GS with Holley 4 barrel with flat spot on acceleration at 3500 rpm

    My carb is 4 barrel 4160. And thanks for your responses. BTW: I mis-stated the vacuum rating of the replacement power valve. It was 2.5 in hg, not 1.5. I plan to test the old 5.0 power valve today and may reinstall it if it tests OK.
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    1997 4.3GS with Holley 4 barrel with flat spot on acceleration at 3500 rpm

    My new to me 1997 Larson 186 with the Volvo Penta 4.3 GS runs a little rough at idle but more importantly when quickly accelerating over 3500 rpm there is a distinct pause/hesitation befor true acceleration occurs. Throughout the upper rpm range there is ample power and with slow throttle...
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    Mercruiser 140 pre-alpha and alpha one upper gearcase compatibility

    Just rebuilt 1973 Mercruiser 140. Engine running great but I now find the outdrive upper gercase is shot. I have a working Alpha one 1.84 upper gearcase (would swap the shorter yoke shaft from the original "R" /pre-alpha upper gearcase with the longer one on the Alpha one) and was wondering if...
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    1976 mercruiser 140 overheating

    Just completed a rebuild on a Mercruiser 140 3.0L GM engine. The engine is running great - still running out of boat on blocks - but oddly per my infrared thermometer the cylinder #1 manifold runs MUCH hotter than the other three (once that specific spot on the manifold gets to 180 or 190 I...
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    motor mounts Mercruiser 3.7L

    Re: motor mounts Mercruiser 3.7L Hey, thanks Bondo. I was thinking I needed to purchase an alignment bar. I also found this very cool dimensional PDF that I'll attach for anyone that might find it helpful.
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    motor mounts Mercruiser 3.7L

    I inherited a boat restoration project from a guy and, unfortunately, he didn't take pictures as he disassembled the hull. What I have now is a completely gutted hull so I have no way of knowing what the original motor mounting structure was to which the 1986 Mercruiser 3.7L 170HP front and...
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    Mercrcruiser 1986 3.7L 170 possible seized?

    Scoured the forum and did not find a solution to my problem so here goes. I just purchased a 1986 Mercruiser 3.7L 170 HP as part of a restoration project. The previous gave up on the project and I thought what the heck, why not?! The engine/outdrive were removed from the boat so I set out to...
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    Force 125 tilt/trim pump bypass valve

    Re: Force 125 tilt/trim pump bypass valve Well I did a lot more than tap it and it did not budge. Maybe after the Liquid Wrench...later. Hope you're still online Jiggz or Pnwboat. I went ahead and removed the anterior shuttle valve from the Chinese pump now on the boat. This is the end that...
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    shock absorber oil amount on 1989 Force 125 HP

    Just rebuilt tilt cylinder and shock absorber. Since shock absorber is not hydraulically controlled by tilt/trim pump, about how much oil should I pour in before reinstall for average running conditions?
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    Force 125 tilt/trim pump bypass valve

    I screwed up a bit when installing a new tilt/trim pump on my Force 125 motor. BTW the pump/motor was from JB Electric TRM8000 pump. Pump/motor went on fine but as I commenced the bleeding process immediately the oil seen through the fill hole became milky. So I thought it best to just try to...
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    1989 Force 125 with one weak cylinder

    Just acquired a 1989 Bayliner with 125HP Force. This boat had been sitting for at leat 2 years so I expected the worst (but got a sweet deal so why not?!). A number of relatively minor issues need to be addressed but first attempt at starting and the motor would barely crank with fresh...
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    Mercarb rebuild and float drop

    I'm rebuilding a Mercarb 3304-9565A1 and, per the official Mercruiser service manual, Vol. 7, it mentions TWO diffferent float drops - 32 mm (in specifications at beginning of mercarb section) and 27 mm (later in the reassembly description).That seems to me a huge difference; does it matter...
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    1/4" thick throttle body gasket for my Mercarb 3304-9565A1

    Anyone know where I can find the 1/4" thick throttle body gasket for my Mercarb 3304-9565A1 carburetor. I'm rebuilding and from what I've read the thicker gasket is the way to go to make for cooler carb and better idle mixture adjusting.
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    1988 4.3L Mercruiser with Mercarb dumps gasoline into carburetor throat at shutdown

    As in title, the fuel dumping seems to then flood the engine so that each restart - even when engine is warm - requires cold start procedure (throttle forward to set choke, etc.) Is float possible sticking? It runs great once started just always hard to start.
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