Redajx
23.05.2021 0:49:26
Id bet your oil injection pump is going,they over oil as they wear here
See full version: Plug fouling 90hp Yam 2 stroke
Id bet your oil injection pump is going,they over oil as they wear here
Below is a link to some photos of the plugs. The plug on the left is from the top cylinder (#1) on down. #1 seems light the culprit, right? Or is #2 and 3 too wet and clean?
Any thoughts are greatly appreciated.
Re: plug fouling 90hp Yam 2 stroke [links]
Probably a simple weekend-warrior-rookie-shade-tree-wanna-be-outboard-mechanic mistake on my part. [links]
how do you know compression is good?
they make spark testers and peak voltage reading meters to make sure the inputs to the CDI and out puts are good.
measure things.
pulling plug wires off while running can cause the voltage to jump at a place it is not suppose to harming components like a the coils. [links]
did you pull them both at the same time?
how did the piston look different?
if everything you test is in spec, then it is time to dig into the fuel
If a bad spark plug remains in your engine for the long period of time, the effects can be devastating to your engine. Sooting can occur which can ruin your boat’s engine.
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The transmission in the Yamaha 50TLR has a gear ratio of 1.85. It is lubricated with a precision blend oil injection system. The recommended oil type is Yamalube 2M and the motor can hold 1.6 quarts of oil. [links]
The Yamaha Outboard motor runs on gasoline with a minimum octane content of 87. The induction system is a charged carbureted loop with exhaust through the prop. The ignition system is a capacitor discharged ignition system that is electric.
The Yamaha Outboard 50TLR motor is a mid-range motor designed to propel small to medium-sized boats. The engine features corrosion protection in the form of the Enhanced Ultimate Corrosion Protection System. It also has three gears: forward, neutral and reverse. It can be controlled remotely and has a manufacturer's suggested retail price of $4,990 as of December, 2010. [links]
The 50TLR is a three-cylinder, two-stroke motor that displaces 698 cc. The bore is 2.6 inches and the stroke is 2.6 inches. The outboard motor weighs 189 lbs. The shaft is 20 inches long and features power trim and tilt, as well as a right-hand gearcase rotation. The motor is cooled with water using a thermostatic control. more
The Yamaha Outboard 50TLR can produce 50 horsepower at 5,000 rpm. The optimum rpm range is 4,500 to 5,500. The compression ratio is 6.0-to-1. [links]