[Solego]

Here's what I've done:
All carbs cleaned and good fuel filter. New fuel tank and lines. New NGK plugs, correct model.
Checked compression when cold and got 120 psi +/- 5 psi on all cylinders.
Checked spark when cold and got well over 15,000 volts at each plug wire.
Replaced CDI unit with identical unit.
Removed all three coils and checked primary and secondary coil resistance both cool and when heated up. All are on spec, based on Yamaha manual.
I checked the triggers' resistance and got 130-135 ohm on all three (black to white/green, black to white/black, black to white/red). This is right to spec.
Checked the triggers' voltage when cranking engine, and got 0.6 volts AC. SPEC. for triggers with DVA is 2.5 volts.

[Eloar]

Since this motor starts right up and runs great for 15 minutes before the problem, am I right to believe that it is not a fuel system issue? Is there any other area besides ignition that it could be?

[SceneSite]

Should I pull the flywheel and see what the stator assembly looks like? Any chance that a fault giving the above symptoms would be visible?

[snowball]

QUESTION: Does the fact that I used a non-DVA meter but watched the readings carefully and they never went above 0.6 volts mean my reading is likely accurate, or do I absolutely need a DVA meter to get correct reading? here

[Shfork]

2007 WELDCRAFT 1652 MUV SPORTSMAN SC ! A Yamaha 50 hp jet outboard with power trim powers this aluminum fishing or hunting boat. Features include: side console, speedometer, tachometer, Humminbird 143 depth/fish finder, MinnKota All-Terrain 40 lb thrust trolling motor, forward console aerated livewell, raised bow and stern platforms w/in-floor seat bases, bow storage, (2) moveable swivel seats, fire extinguisher, marine cranking battery, 5 person capacity, and 6-gallon fuel tank. Also included is a galvanized Venture bunk trailer including; 12” wheels, composite fenders, side-centering bunks, keel roller, tie down straps, swivel jack, and bearing buddies. The package is in good overall condition with minimal wear. There are minor cosmetic scuffs/scratches on the interior and exterior (see pics/video). It has been inspected by our factory-trained technicians and is mechanically sound. Trades will be considered and delivery and competitive financing rates/terms are available. Approximate payment is $169/mo. for 48 mo. with 20% down (WAC). Leaders RPM is one of the largest marine and powersports dealers in the Midwest with over 70,000 sq ft of showroom, parts, and service under one roof located in Kalamazoo, MI. Price is plus sales tax/fees and is subject to change without notice. For more information, please call toll free 866-572-1051. Additional photos and video are available at www.leadersrpm.com. [links]

[knascit12]

Hobby Lobby Marine is family owned and operated since 1961, with Award Winning Sales and Service Departments. Our facility is a quiet and secluded basin in Toms River, NJ. We strive to make every aspect of your boating experience exceptional. Whether you are traveling from Florida, Pennsylvania, Maryland, Connecticut, Massachusetts, New Jersey, Delaware, Virginia, North Carolina, South Carolina, Georgia, or really anywhere on the east coast stop in or give us a call! Let us show you why our customers rate us so highly and why you will find only the best at Hobby Lobby Marine. We are worth the trip if you are coming from FL, PA, MD, CT, MA, NJ, and DE, VA, NC, SC, GA. [links]

[Nerd]

1999 AQUA PATIO 240 RS! A C115 hp Yamaha V4 outboard with power trim powers this pontoon boat. Features include: snap-on mooring cover, color coordinated bimini top, fiberglass console w/removable windscreen and storage, Sony AM/FM CD stereo w/AUX input and weather guard, gauges including; tachometer, voltmeter, fuel, and trim; Humminbird digital depth gauge, 12-volt power outlet, electric horn, navigation/anchor lights, docking lights, captains bench seat w/slider, port and starboard bow couches w/under storage, composite seat bases, stern L-group couch w/under storage (folds out to make sunbed), removable table, pop-up changing room w/privacy curtain, padded and pillowed stern sundeck, stainless ski/tow bar, rear exit w/4-step heavy duty boarding ladder, bow/port/starboard entry/exit doors, beverage holders, (4) stainless mooring loops, M-bracket skirting, fence rails spacers, 23” diameter pontoons, 8’6” beam, marine cranking battery, fire extinguisher, and 14 person carrying capacity. A trailer is NOT included; however, float-on trailers are available starting at $1,999. This boat is in very good overall condition with minimal wear. There are minor cosmetic scuffs/dings on the exterior fencing and graphics (see pics/video). It has been inspected by our factory-trained technicians and is mechanically sound. Trades will be considered and delivery is available. Competitive financing rates and terms are also available. Approximate payment is $161/mo. for 60 mo. with 20% down (WAC). Leaders RPM is one of the largest marine and powersports dealers in the Midwest with over 70,000 sq ft of showroom, parts, and service under one roof located in Kalamazoo, MI. Price is plus sales tax/fees and is subject to change without notice. For more information, please call toll free 866-572-1051. Additional photos and video are available at www.leadersrpm.com. [links]

[specto]

2016 Yamaha Outboards F70 2016 Yamaha Outboard F 70 LA here

[thrillkisser]

2004 SEASWIRL 2101 WA STRIPER! A 150 hp Yamaha fuel-injected outboard powers this walkaround. Features include: bimini top w/canvas enclosure, full windshield, Lowrance LMS-335c GPS/fish finder, in-dash Ritchie compass, Yamaha digital gauges including; speedometer, tachometer, fuel, trim, engine temp, oil pressure, and voltmeter; navigation lights, bilge pump, electric horn, 12-volt power outlet, driver/passenger swivel seats w/removable cushions and sliders; in-floor storage, port/starboard cockpit storage, driver/passenger flip down footrests; stern aerated livewell w/cutting board, (2) removable stern bench seats, port and starboard padded bolsters, port and starboard rod storage, (4) flush mounted rod holders, raw water washdown, boarding platform w/3-step ladder, stainless bow rail, stainless thru-hull fittings, (6) stainless mooring cleats, port/starboard walkaround to bow, deck seat w/removable cushion, and bow anchor locker w/pulpit and roller; CABIN; privacy door, 6-piece removable cushion set w/under storage, wrap-around storage shelf, marine toilet w/holding tank, deck hatch w/screen, (2) hull windows, mirror, carbon monoxide detector, and overhead light. The trailer is NOT included. The boat is in very good overall condition with minimal wear and corrosion. There are minor cosmetic scuffs on the exterior and hull (see pics/video). It has been inspected by our factory-trained technicians and is mechanically sound. Trades will be considered and delivery and competitive financing rates/terms are available. Approximate payment is $214/mo. for 144 mo. with 20% down (WAC). Leaders RPM is one of the largest marine and powersports dealers in the Midwest with over 70,000 sq ft of showroom, parts, and service under one roof located in Kalamazoo, MI. Price is plus sales tax/fees and is subject to change without notice. For more information, please call toll free 866-572-1051. Additional photos and video are available at www.leadersrpm.com.

[HopeFlynn7x]

Purchased in 2007. Estimated number of hours is 50 - 70 hours. Only used on a tender. Well maintained - engine and gear oil and spark plug changed every year. Stored in basement in the offseason, with frequent pulls on the manual starter handle. Will throw in my external fuel tank for free (3 Ga). I have all the original documentation and owners manual.- Model Year: 2007- Model: F4MSH- Short shaft- Manual start- Forward, neutral, reverse- Internal gas tank (.29 Ga) and fuel joint for external fuel tank

[xuO4k04c6Ng]

One Gasket Kit [including 1 Head Gasket, 1 Head Cover Gasket, 1 Base Gasket, 2 Reed Valve Gaskets, 1 Carburetor Gasket, 2 Exhaust Cover Gaskets, 1 Upper Crank O-Ring, 1 Lower Crank O-Ring, 1 Thermostat Cover, 1 Fuel Pump Gasket, 2 Lower Crank Oil Seals, 1 Upper Crank Oil Seal, and 3 Carb Mounting O-Rings] here

[chizu]

Featuring all the parts needed to effectively rebuild an outboard powerhead in one convenient package, our powerhead rebuild kits offer a combination of cast WSM Pistons complete with Japanese rings, pins, and clips, the highest quality gaskets available, and the necessary crank bearings, rod bearings, and rod bolts. These kits are available with Standard-Size Pistons or .010/.020/.030/.040 Oversize Pistons, so please specify when placing an order.

[geebus]

Three Pistons [Complete with rings, pins, and clips]

[sixy]

Three Upper Rod Bearings [Note: this kit does not include Lower Rod Bearings due to the model of the powerhead.] [links]

[OneFixt]

This rebuild kit is designed for use with Yamaha 60/70 HP 3-Cylinder Powerheads from 1984 and Up. The kit includes the following:

[avatar1135]

6300 rpm
Alternator Output at W.O.T.: 17 Amp
Compression Ratio: 9.4:1
Fuel Induction System: EFI
Weight*: 114 kg (253 lbs)
Recommended Fuel: Octane 87
Recommended Engine Oil: Yamalube® 4M (See owner’s manual)
Recommended Fuel Filtration: Yamaha 10-Micron Fuel/Water Separating Filter (external)
C.A.R.B. Rating: 3-Star
Exhaust: Through Propeller
Intake: 16
Ignition: TCI Microcomputer
Spark Plug: LKR7E
Alternator Output: 17 Amp
Starting System: Electric
Lubrication: Wet Sump
Engine Oil Capacity: 2.1/1.9
Recommended Cooling: Thermostatic Control
Ethanol Blend Limit: 10% Maximum
Gear Ratio: 2.33:1
Gear Shift: Forward, Neutral, Reverse
Shaft Length: 20″
Degree of Tilt: 65°
Degree of Trim: -4° through +16°
Dry Weight: 114 kg (252 lbs)
Mounting Centers: N/A
Steering Angle (maximum): 40° from center, either direction
Warranty: Limited 3-year Pleasure, 3-year Government, 1-Year Commercial
NOTES:
*Weight refers to shortest shaft length, and is measured without motor oil, gearcase oil and propeller (except models 25 hp and under, which include a standard propeller). All Jet model weights include the jet pump assembly (weight estimated). here

[chyraski]

Model Specific Features
Available for mechanical remote or tiller control
Only 253 pounds
Available in a 20” shaft
Powerful 17-amp alternator
Optional Variable Trolling RPM Switch (VTS®) via the Multi-Function Tiller Handle, Command Link® tachometer or helm-mounted remote VTS
Specifications
Engine Type: i4
Displacement: 1.0L
Bore x Stroke: 65 x 75mm (2.56 x 2.95 in.)
Prop Shaft Horsepower: 70hp at 5800 rpm
Full Throttle RPM Range: 5300

[konaya]

Description
Our 1-liter 70-hp midrange features a two-piece upper case and 10 percent lighter pistons. It’s up to 80 pounds lighter than other four-stroke competitors and the class-leader in power-to-weight. Combined with its 16-valve SOHC design and 17 percent larger intakes, and it’s one of the most responsive outboards on the water.

[DayLightStranger]

Power & Performance
Single Overhead Camshaft: A Single Overhead Camshaft (SOHC) on the F70, F60 and F50 provides a compact, lightweight, space-saving design.
Fuel Economy: Precision Multi-Point Electronic Fuel Injection delivers the exact amount of fuel needed for optimum performance and efficiency. Yamaha’s EFI optimizes fuel atomization further enhancing fuel economy.
Powerful Hole Shot: A Composite Intake Manifold features long tube intake tracks, tuned to increase airflow, which boost low-end and midrange torque. This means a more powerful hole shot and increased acceleration. Even with all this responsive power, an air silencer box and surge tank reduce air intake noise and air turbulence for smooth, quiet operation.
Optimum Performance: A TCI microcomputer ignition adjusts timing to maintain optimal engine performance, economy and power under all operating conditions.
Precise Throttle Control: All air entering the engine block is routed through a single throttle valve, to ensure the precise amount of air necessary for optimum power and fuel efficiency. It then enters each cylinder through individual long intake tracks, which are ‘pulse tuned’ to provide air at the precise volume and timing for maximum density and power.
Reliability & Durability
Corrosion Protection: Combined with our proprietary alloy (YDC-30), our exclusive Phaze Five™ electro-deposited, anti-corrosive paint system provides a tough, five-layer barrier against corrosion. This protection is standard on all the Yamaha Midrange 70-, 60- and 50-horsepower four strokes.
Engine Warning System: This system protects the outboard with a range of functions including: overheat protection and low-oil-pressure warning (automatically reducing maximum RPM to 2000), over-rev protection, water-in-fuel detection, start-in-gear protection and shift-in prevention at open throttle.
Wet Sump: The F70, F60 and F50 use a pressurized oil delivery system and incorporate a compact and durable oil pump to keep all of the moving parts of their SOHC systems lubricated and running smoothly for maximum reliability.
Magnetic Drain Plug: Located in the lower unit to remove metal particles from the gear oil and prevent gearcase damage.
Convenience & Control
Control and Comfort: Our optional, award-winning Multi-Function Tiller handle features a Variable Trolling RPM Switch (VTS®). It allows for precision trolling speed adjustments in 50-RPM increments. Compatible with all Midrange models.
Easy Engine Flushing: A Freshwater Flush Device allows you to flush the engine without running it, for added convenience and extended engine life.
Gauge Compatibility: Optional Command Link® gauges provide real-time outboard performance, boat systems and environmental data at your fingertips. Streamlined displays are designed to withstand the elements and are available in square or round style for single- or multi-engine applications. [links]

[n0m4d]