[EconomyBuilder]

An outboard motor is an engine mounted on a boat that performs independent of other mechanical or electrical devices on board. The coil is a critical part of an outboard engine's ignition system. A coil is composed of a primary and a secondary circuit. A faulty coil means the engine will turn over, but not fire -- or fire, but not correctly. If your outboard motor will not fire or runs hard -- chugs and lurches -- test the resistance of the coil using a voltmeter. The values given by a volt meter are in OHMS.

[v-tim]

Test the primary circuit. Place one probe from the amp meter on the positive terminal and the other probe on the other terminal. It is irrelevant which probe touches which terminal because you are testing a circuit. The values of an outboard motor must fall between .02 and .04. If your OHMS do not fall within that range, your coil is bad.

[MaXviUs]

Disconnect the wires from the positive and negative terminals on the coil. These terminals are connected to the primary circuit. The primary circuit is connected to the battery and creates a charge.

[marieellis444]

Re: Yamaha 50 hp Four Stroke, difficult Starting " Cold " more

[sstsf]

Re: Yamaha 50 hp Four Stroke, difficult Starting " Cold " here

[enoxice]

hello<br /> hahaha patience.<br /> wait for the manual.<br /> you will find the tinest bit of trash or shellac in the carbs will affect cold starts on that motor. you will also find that the choke closing is critical and proper adjustments are imperitive.<br /> keep the NGK's but really on that ign system it doesnt matter.<br /> good luck and keep posting more

[joechip]

Managed to get round to having a look at the engine today . tested out feed to solenoid, seemed ok as did the grounding "earth" wiring for the solenoid, watched solenoid function when starting and the plunger "retracted" moving the linkage slightly . according to the Clymer manual, there is an electro thermal ram, this is a black plastic encased cylindrical devise, which on first impression would appear to be some sort of solenoid? . it has a plunger, and the plunger seemed to extend as the engine got warmer . so all in all .. the solenoid operated with the starter motor being cranked, as mentioned the plunger retracting and moving the link, and as the engine warmed the electro thermal ram extended gradually the warmer the engine got.<br />One point I did notice was following the diagrams in the Clymer manual, mentioned two thermal switches, simply referred to as Thermal switch 1 and 2. I'd read into the manual and I'd presumed switch one was for the audible warning feed to the remote, and as it mentioned in the manual switch two was the thermal bridge for activating the choke solenoid, anyhow it turns out there is only one thermal switch on this engine, I look around the engine to the extent I followed the wiring loom and I never found switch 1.<br />When should the choke solenoid operate ? .. is it purely when the starter motor is operating only ?<br />And this devise the japs call an electro thermal ram. as mention previously that it extends as the engine warms up, am I right in thinking the enrichment is given when the plunger is in a retracted position, and as it extends it is diminished ?<br />Any help much appreciated . cheers guys [links]

[alowm]

There are four unique kinds of Yamaha 50 hp outboard repair manuals: owner’s manual, repair manual, factory service manual, and owner’s workshop manual. With each manual, there are specific instructions on how to repair or maintain your outboard motor. The owner’s manual often entails general repair and maintenance with helpful tips and instructions on how to take apart or rebuild a motor. Included in these instructions are visual guides, in the form of diagrams or illustrations. There is also information on where to find specific controls.

[TORNS]

When I down loaded the 50HP manual the list of covered motors included the
50TLRD. Which manual and supplement do I use.
My serial number plate reads:
50TLDR
6H5K L 1004226
N

[Alex]

The only 2005 50hp model not listed here is T50TLRD LIT-18616-02-85

[mike_la_jolla]

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[aurelian]

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