Starting Problem

[big_johnst]

My 1985 55 HP Mariner/Yamaha is hard starting. I am having to use starting fluid to kick it off before every trip which is about every two weeks. Once started it runs great and will continue to start without problems for the rest of the weekend. Since it runs fine after starting, I just chalked it up to the motor getting old. Now after reading on this site about the hazards of starting fluid, I would like to solve the problem.<br /><br />I use this procedure. Pump up bulb, advance throttle, choke, start. It use to work great but now when I pump up the bulb I hear a squirting sound like gas going into the cylinders. This doesn't seem normal. My guess is the motor is flooding because the float level is set too high. Also, the spark plug gap in my manual is smaller than the one NGK recommends on their web site. I have cleaned the carbs recently with no improvement. I am baffled. The motor used to start very easily. This is more of an annoyance than anything, but I would like to fix it. This motor is a corporate halfbreed. I have never been able to find a manual that specifically covers this model. The only manual that I have is an all models type. I used the instructions for the 40 hp for my carb cleaning. The float needle valves do not seem worn (no grooves, etc.). I have checked on a carb kit for this motor. It is $115.00, which seems pretty outrageous to me. especially since the only things in them are a couple of gaskets and the needle valve. If someone has ideas, let me know. It really pains me to take it to the shop.

 

[rickdb1boat]

Re: Starting Problem

Make absolutly sure that the choke is working. re-check float level and make sure nothing is sticking. Next time before you try to start it(Cold), mix up some pre-mix in a spray bottle and give the carb throats a few shots and see if it fires. If so, probably a bad choke or choke selonoid.

 

[Troy_from _Oz]

Re: Starting Problem

I recently found out that parting out the carb kit may be cheaper than going for the 'kit' - ie. just buy the bits you need.<br /><br />See what you think for your motor here:<br /><br /> http://www.mercruiserparts.com/SelectProductLine.asp <br /><br />best of luck<br /><br />Troy

 

[BillP]

Re: Starting Problem

Did you change plugs or just check them? I've only had one motor (Kawasaki 440 2 stroke air cooled)that NGK plugs lasted long on and many motors (OBs) that they didn't. You can't look at the plug to tell if it is bad and checking for spark is not 100% accurate that it will be strong enough under compression. Regardless, I would put new plugs in and gap at what Merc says.<br /><br />Have you tried starting cold without choking or priming? <br /><br />Have you pulled the plugs before hitting with starting fluid to see if they are wet? At least that will tell you for sure if flooded.