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  Merc 135 nearly impossible to start

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Author Topic:   Merc 135 nearly impossible to start
kgregg posted 09-21-2002 02:06 PM ET (US)   Profile for kgregg   Send Email to kgregg  
I just spent nearly 30 mins squeezing the bulb, setting the choke (unsure if this even works), turning the ignition key, etc before the beast (AKA 1991 Merc 135) would spring to life. I changed the fuel supply line (with inline bulb) about 10 days ago but this did not help. I've oriented the bulb so it points somewhat vertical (with discharge side pointed up) but this has not helped. I wire brushed spark plug tips... they are clean. Engine will idle and run just fine once it gets started and warmed up (so fuel filter does not seem to be clogged). Any ideas? I've been an outboard owner for all of 29 days now. I have a Clymer reference manual for engine. Thanks. Kevin
Dick posted 09-21-2002 05:37 PM ET (US)     Profile for Dick  Send Email to Dick     
Are you pushing the key in while starting to engage the choke?

Are you advancing the neutral start throttle?

Never wire brush spark plugs, replace them if they need it.

kgregg posted 09-21-2002 08:05 PM ET (US)     Profile for kgregg  Send Email to kgregg     
>Are you pushing the key in
>while starting to engage the choke?

Yes. But I never hear the "click" that the book on the motor says I should hear. So, I'm guessing something with the choke is not right.

>Are you advancing the neutral
>start throttle?

I guess you're asking me if I am applying part throttle (in neutral) while trying to start engine. Yes.

>Never wire brush spark plugs,
>replace them if they need it.

OK. They weren't very fouled to begin with.

Kevin

quattro20vt posted 09-21-2002 11:59 PM ET (US)     Profile for quattro20vt  Send Email to quattro20vt     
quote:

>Are you pushing the key in
>while starting to engage the choke?
Yes. But I never hear the "click" that the book on the motor says I should hear. So, I'm guessing something with the choke is not right

keep in mind the key push isn't really a choke, but an "enrichener" which just opens a valve (the click you should hear) to dump additional fuel into the engine for as long as you push on the key. i usually do so for 3-5 seconds before turning the key to start, and my 91 135 starts right up...when i forget...your engine's behaviour sounds really familiar ;)

quote:

>Never wire brush spark plugs,
>replace them if they need it.

OK. They weren't very fouled to begin with.



I'm with Dick here--wire brushing a plug may create conductive tracks across the ceramic insulator, shorting or seriously weakening the spark. time to replace them.
kgregg posted 09-22-2002 10:00 AM ET (US)     Profile for kgregg  Send Email to kgregg     
<blockquote>
keep in mind the key push isn't really a choke, but an "enrichener" which just opens a valve (the click you should hear) to dump additional fuel into the engine for as long as you push on the key. i usually do so for 3-5 seconds before turning the key to start, and my 91 135 starts right up...when i forget...your engine's behaviour sounds really familiar ;)

</blockquote>

I never knew that I needed to push on the key while turning it. I thought a single push would turn on the enrichment. I will push & hold key in while turning it next time I start motor. Thanks for the tip.

simonmeridew posted 09-22-2002 12:57 PM ET (US)     Profile for simonmeridew  Send Email to simonmeridew     
I can never tell if plugs for 2 stroke engines are OK just by looking at them. Not like a 4 cycle plug anyway. When in doubt get new plugs and throw out the old ones so they don't get mixed up.
simonmeridew
jstachowiak posted 09-23-2002 09:09 AM ET (US)     Profile for jstachowiak  Send Email to jstachowiak     
Call you local Merc dealer and get the Quicksilver primer bulb. The Tempo primer bulbs do not work. Most are defective off the shelf. The new Merc Quicksilver bulb has a yellow band on it. My 90HP did the same thing, ruined a family outing. Since replacing the bulb with the new one, motor starts right up. Bulb takes 4 to 6 pumps and it is rock hard, no comparison to old bulb.
Bigshot posted 09-23-2002 10:02 AM ET (US)     Profile for Bigshot  Send Email to Bigshot     
I push my key in and out like 5 or 6 times. Then push and hold while turning key. You are either doing it wrong or choke is screwy. Unlike 4 strokes, a 2 stroke may never fire when cold without a choke.
rmart posted 09-23-2002 11:35 AM ET (US)     Profile for rmart  Send Email to rmart     
I just purchased a complete Tempo fuel line this morning for my Yamaha 115. Are they really that bad? I have not installed it yet but I was experiencing great difficulty getting the prime bulb to harden. This problem got so bad the engine ran rough and had difficulty running at more than an idle speed. I was hoping that a replacement fuel line would solve the problem (since the primer bulb was not getting hard).

Now I wonder if the Tempo I just bought should be opened???

jstachowiak posted 09-23-2002 12:10 PM ET (US)     Profile for jstachowiak  Send Email to jstachowiak     
I'm not sure the primer bulb will solve a problem of rough running, all I know is that I could not get fuel to the carbs with my new Tempo primer bulb (roughly 12 feet). And I'm not the only one. Jimh wrote about in "A primer on primer bulbs". My Merc mechanic said that this new Quicksilver primer bulb was a subject of a tech bulletin and is the major problem with hard starting.

The difference was night and day on how fast the bulb got hard and how hard it got. I can now smell gas right away when I pump it up and my 1979 merc fires right up every time.
And it is a cheap thing to try.

kgregg posted 09-23-2002 05:11 PM ET (US)     Profile for kgregg  Send Email to kgregg     
I held in the ignition key for 5 seconds before starting motor Sun and it fired up nearly right away. I'm pretty certain that my failure to HOLD key in for more than a split second was making motor so hard to start. This was never properly explained to me by guy who sold me boat and is not readily apparent when reading shop manual. Good thing for this web site. Kevin (THANK YOU DICK!)
frank_king posted 09-26-2002 05:37 PM ET (US)     Profile for frank_king  Send Email to frank_king     
tempo fuel lines and bulbs are junk
frank_king posted 09-26-2002 05:38 PM ET (US)     Profile for frank_king  Send Email to frank_king     
rmart replace yam parts with yam parts....
jimh posted 09-26-2002 11:32 PM ET (US)     Profile for jimh  Send Email to jimh     
What do sweet potatoes have to do with starting a Mercury engine?
knothead posted 09-27-2002 02:09 PM ET (US)     Profile for knothead  Send Email to knothead     
JMH

Sweet Potatoes aren't yams and yams aren't sweet potatoes, at least in North Carolina.

This is small potatoes.
Cheers, Knothead

jimh posted 09-28-2002 11:25 AM ET (US)     Profile for jimh  Send Email to jimh     
I finally figured out that frank_king was addressing the question of rmart regarding replacing his Yamaha fuel lines and primer bulb with Tempo branded parts.

Along this same line, I did just that last year when I rebuilt the fuel system on my boat. I took out a pair of perfectly good Yamaha primer bulbs (that were 14-years old) and replaced them with some Tempo bulbs fresh off the shelf at the marine store.

The Tempo bulbs did not work well at all. They would never get firm.

I replaced one with a Quicksilver bulb. It did not work any better.

Finally I got new-style Mercury primer bubls. They pump to firm in a few pumps.

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