1992 100HP Mariner

[Charlie T]

I have a rebuilt 1992 100HP Mariner in-line 4 cylinder outboard that I am having trouble starting FOR THE FIRST TIME ONLY while in the water. It doesn't seem to do this when running it on a hose. It will fire over then die at least 10-15 times before it starts and stays running. I tried choking it longer and not choking it as much but nothing seems to help. This only happens when starting the motor for the first time when offloading and the rest of the time it starts and runs fine. Also, I have a problem with the motor bogging for a second or so when trying to get on step for the first time only. Once it takes off, its fine but it just gives me trouble to get started each time. It did this before the motor was rebuilt and still does it after the rebuild. Also, I need to change the plugs. It has some NGK BP8HS-10 plugs in it now. Should I go back with those?

 

[Laddies]

Re: 1992 100HP Mariner

It sounds like a lean idle mixture

 

[sprinkler]

Re: 1992 100HP Mariner

I have a 1988 100HP. I don't know how similiar a 1992 is to mine, but your problem sounds familiar to me. Mine is a hard-starting engine. Before starting cold, I do the following:<br /><br />- make sure the engine is trimmed all the way down<br />- pump bulb until it is firm<br />- open the cowling and prime the carb. On mine there is a little black button on the right side of the engine (if you're facing the engine from inside the boat). hit the button about 10 times to prime the carb<br /><br />However, I'm not sure why yours would be easier to start while on the hose.<br /><br />Hope this helps.

 

[Charlie T]

Re: 1992 100HP Mariner

I'll try that this weekend.<br />Thanks!

 

[sbva]

Re: 1992 100HP Mariner

until you figure out the problem, when launching try starting on the trailer with just the lower unit submerged. Once started back the trailer rest of the way down. <br /><br />Could save you a dead battery to mess up the beginning of the day

 

[Charlie T]

Re: 1992 100HP Mariner

Originally posted by sprinkler:<br /> I have a 1988 100HP. I don't know how similiar a 1992 is to mine, but your problem sounds familiar to me. Mine is a hard-starting engine. Before starting cold, I do the following:<br /><br />- make sure the engine is trimmed all the way down<br />- pump bulb until it is firm<br />- open the cowling and prime the carb. On mine there is a little black button on the right side of the engine (if you're facing the engine from inside the boat). hit the button about 10 times to prime the carb<br /><br />However, I'm not sure why yours would be easier to start while on the hose.<br /><br />Hope this helps.

I looked on my motor and it doesn't seem to have a carb prime.

 

[BikerBoater]

Re: 1992 100HP Mariner

I had the same problem with my 1988 100 HP (2+2), an experienced boater told me to:<br /> <br />1. Trim all the way down (floats in carbs must be level)<br />2. Pump the fuel bulb until hard (fill those fuel bowls)<br />3. Push the release for the throttle so it won't be in gear and push forward to first soft spot. (normal position for idle forward)<br />4. Turn the key to on postion (not start postion) and push the key in 3 times for about 1 second each time (primes carbs).<br />5. Turn key to crank engine. <br /><br />Usually will start on 1st or second try.<br /><br />I only pump the fuel bulb hard and push the key once when starting a warm engine.

 

[sprinkler]

Re: 1992 100HP Mariner

BikerBoater - I have the same engine. I'm not aware that pushing the key in multiple times primes the carb. But if you push the key in and hold it it chokes the engine.

 

[BikerBoater]

Re: 1992 100HP Mariner

I could be wrong about the priming the carbs. <br />I thought the "enricher system" squirted fuel into the crankcase (intake on 2 stroke) when the key was pushed.<br />Anyone?

 

[emckelvy]

Re: 1992 100HP Mariner

The "primer" valve is held open only when you press in the key with the ign in the 'on' or 'start' position. It has no motive force of its own, only residual fuel pressure from when you pump the primer bulb, and then the pressure developed by the fuel pump when you crank the engine over.<br /><br />My buddy had a 1990 90HP with a similar problem. He found that if he depressed the key after he started cranking, it usually didn't start too well. But, if he pressed the key in first, then cranked over, it kicked off every time. <br /><br />Strange but we figured maybe the voltage drop of the starter cranking over was keeping the priming valve solenoid from 'sucking' in. Whereas, if you activated the primer first, there was enough power to keep it in while cranking. <br /><br />Just a theory, but it might be worth trying.<br /><br />Just be sure to keep the key pressed in to activate the priming solenoid, until the motor kicks.<br /><br />Let us know how it works out............ed