Questions tagged [boat]

Questions about boats, boat engines, and other relevant (mechanical) questions about watercraft

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2 votes
1 answer
39 views

Normally-high run switch vs coil-ground out to turn off

I'm restoring a 1958 larson Playboy - it looks like it originally came with an evinrude engine as there was an evinrude starter solenoid box in the back. This was cabled into the main key which has ...
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0 votes
1 answer
33 views

What's the power problem?

2-stroke marine engine (200 Yam) starts and revs just fine out of gear. Put into gear and will only achieve 40kph or so. Old petrol (50:1)? Changed tanks and new fuel - same. Boat hull dirty? A little,...
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6 votes
2 answers
521 views

Is there such a thing as a biodegradable (boat propeller shaft) grease?

I'm using a Volvo Penta Propeller Shaft grease to to lubricate and seal the propeller shaft in my boat. The grease eventually gets "squeezed" out from the various lubricated spots and ends ...
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  • 183
2 votes
2 answers
343 views

Vacuum never decreases while leaning out carburetor mixture

I have a Rochester Quadrajet 4MV carburetor that has 2 mixture adjustment pins in the front of the carb. As I understand it, you tune these by continually tightening the mixture screws while watching ...
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1 vote
0 answers
53 views

1997 Sea Rayder F16 will not crank

looking for some help. Last week had my jet boat out for the first time this year. It ran ok - a bit of hesitation but figured after sitting for almost a year this would be normal until i ran it for a ...
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1 vote
0 answers
120 views

2004 Yamaha Outboard 50HP vibrating around half throttle (2700-3100 RPM)

I've recently bought a 2004 Yamaha outboard, specifically a F50 TLRC (four stroke 50HP) and it is generally in good condition, takes a couple key turns on startup but always starts, a little rough on ...
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  • 111
2 votes
1 answer
120 views

Ran 2 cycle without mixed gas :(

So I just purchased my first outboard boat motor. It’s a 9.9hp 1997 Mercury. I should have known better but didn’t realize I needed to run 2 cycle gas. So I ran it for about 15-20 minutes total. ...
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0 votes
1 answer
69 views

Battery connection

I screwed up and touched negative cable to positive on battery and it sparked and now when connected correctly no juice anywhere. Should there be a fuse somewhere?
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3 votes
1 answer
49 views

course of action: water cooling outlet in outboard does not reliably produce jet

There is a tohatsu 9.8hp outboard motor which should produce a jet of water out from the cooling outlet when the engine is running, but sometimes doesn't. When the engine is started, (seemingly) ...
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0 votes
1 answer
42 views

Should I change the engine oil on a boat engine after it sat for 5 months?

I have a Reinell Bowrider, with a 190 HP Chevy engine, that hasn't been started in about 5 months. Before starting it, should I change the engine oil? Or will it run okay without changing it?
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  • 1
2 votes
1 answer
847 views

How can I do a simple coil test to check for spark

I've got a boat engine which will not start. The engine was factory refurbished last year, so I do not expect wear and tear to cause the issue. I do not see sparks on the plugs. So I'm trying to test ...
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  • 183
1 vote
0 answers
330 views

1997 Mercury 9.9 HP 2-Stroke starting issue

I've been banging my head on a starting issue with the outboard motor mentioned in the subject line (it's a manual pull-start). Problem is that when I pull it over, it doesn't sound/feel like it even ...
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  • 111
1 vote
1 answer
237 views

What is behind the external vent cover on the driver's side of a runabout boat?

I was power washing my runabout boat today and sprayed over this vent. What is behind the vent? Is it OK to get it wet? My boat is a Stingray, but this picture is from a Bayliner.
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  • 111
1 vote
1 answer
268 views

Lighten flywheel to increase top speed?

i have an old gasoline fueled skiff that only makes 3-4 knots. I find this to be strange since the engine is rated at 10-12 horsepower. It isn't that heavy and i figure it should be able to do more. ...
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2 votes
1 answer
56 views

Did I damaged my engine trying to remove the flywheel nut with resistance on the pto coupler?

I was trying to remove the flywheel nut while providing resistance to the pto coupler, now if I spin the flywheel and provide resistance to the coupler the coupler remains in place while the flywheel (...
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  • 489
3 votes
2 answers
255 views

Diagnosing a boat that wont start

Having some problems with my '92 Boston Whaler Rage jet-boat again.... See this post for all relevant boat info: Starting a 2 stroke jet boat after several years Ok, so I did basic troubleshooting, ...
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  • 489
3 votes
0 answers
134 views

No Start, No Crank Issue

I have a Volvo Penta 4.3gxi-g with a no start, no crank condition. This started with an intermittent no start, no crank condition. It is impossible to get to the starter motor itself due to how the ...
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  • 31
3 votes
0 answers
128 views

Boat Inboard engine Losing Power

After about an hour of running, I find the engine starts to lose its power at say 3500RPM, and what I have to do is lower it to 2000RPM, if I try to increase the RPM back to 3000-3500RPM it starts to ...
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12 votes
1 answer
86k views

Does engine oil get old and go bad?

Does engine oil actually go bad from just sitting within an engine that's not getting use? I feel conventional motor oil has been sitting underground for millions of years prior to being extracted and ...
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  • 223
1 vote
0 answers
53 views

charging boat battery

I have a heavy (65 lb) battery for my boat & live upstairs (no elevator) in a condo. I don;t wanna keep bringing it inside to charge it & the only power plug I have outside is where I park my ...
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  • 21
0 votes
1 answer
74 views

Which 4 wheel drive to use to pull boat out of harbor? [closed]

I didn't see this asked so thought why not since I'm stuck on which to use. When pulling a 15ft or more boat out of the harbor while your truck is on the ramp partially in the water and connected to ...
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2 votes
1 answer
1k views

I have a Mariner 5 HP outboard. I need info please?

My Mariner is a 5 HP model 5M, Code 6E3 S, and Serial # 148968. I'd like to know who made it, what year model it is. Help Please !
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3 votes
2 answers
85 views

Boat part what part is this?

I own a boat with Mercury 90 motor. There is a red switch on the engine used as security to start the boat, very simple. I've lost this key and want to replace it, but have no idea what it is called. ...
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  • 39
9 votes
2 answers
854 views

Carb. Rebuild or Adjustment?

Just put a rebuilt 2 stroke and brand new Mikuni SBN carburetor in my jet boat. Got her running no problem the first couple times, now it seems I can't get any gas into the carburetor from the primer ...
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  • 489
3 votes
0 answers
182 views

Jet Boat, Cavitation or Misfire?

My jet boat is making a 'putting' noise when trying to accelerate. You can find all details regarding my boat here: My Boat Info The noise seems to happen in the mid-rpm range; 4,000 - 4,800 RPMS, ...
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  • 489
3 votes
0 answers
485 views

Yamaha F40F outboard boat engine continuous alarm when starting

I'm trying to start a very new 2014 Yamaha F40F engine on my dad's boat. The engine was used yesterday by my brother without issues but today it won't start at all, and I get a continuous alarm sound ...
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4 votes
4 answers
3k views

Why do I connect the positive and the negative to the battery on a boat?

My trolling motor for my boat has a black and a red connection. The red goes to the positive on the 12 volt battery. The black goes to the negative on the 12 volt battery. Could I connect the black ...
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6 votes
3 answers
4k views

Boat Not Getting Power to the Starter Motor

Just rebuilt most of a 2 stroke jet boat. ( if you need / want any boat details, see: this thread ) First day the boat started fine, no problems, next day I tried again and the CDI fuse had blown ( ...
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  • 489
3 votes
3 answers
690 views

Replacing a boat's blown CDI fuse

Just rebuilt most of a 2 stroke jet boat. (if you need / want any boat details, see: this thread) Yesterday, she fired right up no problem, today she won't even turn over. After some basic ...
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  • 489
5 votes
2 answers
5k views

Where Does My Boats Main Negative Battery Terminal Wire Go?

Just rebuilt most of a 2 stroke jet boat. ( if you need want any boat details, see: this thread ) When I purchased the boat, the thickest negative battery terminal wire was not connected to anything....
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  • 489
3 votes
2 answers
90 views

Hardware Installation on Fiberglass boat

I had to rebuild the jet pump on a 1992 boston whaler rage. I noticed a putty like substance on the hardware I removed directly from the hull, I assume it is used to waterproof the bolt holes in the ...
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  • 489
4 votes
1 answer
1k views

Re-wiring Harness in Jet Boat w/ Ford 460

I'm replacing the wiring harness on my jet boat. It has a Ford 460 in it. The boat has five gauges on it. A tachometer, oil pressure, amperage, fuel gauge, and water temp. There is also a toggle ...
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  • 538
11 votes
4 answers
2k views

Starting a 2 stroke jet boat after several years

The parents in law gave me a jet boat, it hasn't been started in 5 years. The boat resided in NH on a trailer on their yard for 5 years, so it has seen freezing temperatures frequently. From what I ...
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  • 489
9 votes
1 answer
3k views

What is the yellow precipitate in my outboard's carburetor?

I've got a 2008 Tohatsu 9.8 HP four stroke outboard. My low speed jet keeps getting fouled and on several occasions, I've found yellow almost crystalline "growths" for lack of a better word inside ...
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  • 233
4 votes
3 answers
2k views

1999 Yamaha 80hp Outboard Electrical Problem (Rectifier Overheating)

I recently purchased a pontoon boat and on day #3 my motor died, I'm hoping to get some help from the community with correctly diagnosing and fixing the problem. The motor - 1999 Yamaha 80hp four ...
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  • 51
4 votes
0 answers
892 views

How to wire an ignition switch for boat throttle controller

I have an old Bass Tracker boat. They no longer make the throttle controller for the boat, but I need to replace the ignition switch (which is in the throttle controller). I looked online and this ...
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4 votes
1 answer
1k views

Engine Turns but won't start

It's an old Renault 4-cylinder carburetor engine in a boat. I don't know much about engines so let me know if I'm not including important information. The boat is old but new to me. I drove it for ...
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  • 213
2 votes
1 answer
4k views

Ford 460 Does Not Start Only Backfires When Cranking Over

I have a Pioneer Jet Boat with a Berkeley Pump attached to a Ford 460 big block. The 460 has a Holley carbureter, and Basset water-injected headers. The engine was running fine until one day when ...
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  • 538
7 votes
1 answer
2k views

DIY Alternator Belt Tensioner

I've got a diesel engine in my boat, but the previous owner had somehow snapped the alternator bracket, and fitted it fixed to the boat rather than the engine. Now the alternator doesn't move when the ...
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  • 203
3 votes
1 answer
378 views

Mercedes OM636: Can I Resolder Wire to Coolant Temperature Sensor?

The wire contact connected to the Coolant Temperature Sensor of my Mercedes OM636 (Boat engine same as Mercedes 170D, 180D) was corroded and got accidentally snapped off. Can I just solder this back ...
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  • 133
3 votes
1 answer
2k views

Wiring up boat electronics - 240V and 12V with inverter

I've just bought a boat, but the electrical systems need a bit of an upgrade before going cruising for any length of time. At the moment, All the 12V runs from a single starter battery, and there are ...
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  • 203
5 votes
1 answer
254 views

Which engine part is this?

I own a speedboat that is powered by a 5 liter V8 Mercruiser with 200bhp. Yesterday when trying it out for the 1st time this season, 2 things happened: 1 - the boat was always trying to turn left ...
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  • 238