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Old 02-07-2012, 18:09   #1
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Cold-starting O/B

My 2hp Yamaha dinghy O/B is very hard to start on days when it gets down to about 10degC. I try different combo's of throttle and choke, but it's still a bugger. When it finally does start, it runs fine, and at higher temperatures it starts first pull and runs fine.

The plug has done only a few hours, and I have stripped, flushed and cleaned the tank, filter, line and carby and refilled with fresh mix.

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Old 02-07-2012, 19:45   #2
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Re: Cold-starting O/B

Check the compression. Low compression will inhibit starting due to blow by but once the parts are warmed, the compression rises enough for normal starts. It should be around 125 psi.
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Old 03-07-2012, 00:39   #3
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Re: Cold-starting O/B

Got plenty of compression.
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Old 03-07-2012, 08:48   #4
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Re: Cold-starting O/B

Magneto coil is on the way out-- it was on mine to cause that symptom.
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Old 03-07-2012, 09:48   #5
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Re: Cold-starting O/B

You pull the Choke button out, into the "Start", position, right?
http://www.yamaha-motor.com/assets/s...-03-58_567.pdf
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Old 03-07-2012, 12:10   #6
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Re: Cold-starting O/B

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Originally Posted by GordMay View Post
You pull the Choke button out, into the "Start", position, right?
http://www.yamaha-motor.com/assets/s...-03-58_567.pdf
MY yamaha 2CMH has a little flip lever than you turn from 1 o'clock back to 11 o'clock for choke.
Jus sayin.
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Old 04-07-2012, 00:48   #7
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Re: Cold-starting O/B

Yep, like I said, I've tried all combinations of choke and throttle settings.
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Old 04-07-2012, 09:34   #8
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Quote:
Originally Posted by Blue Stocking
Magneto coil is on the way out-- it was on mine to cause that symptom.
These engine apparently have a reputation for this but improving the spark quality is my vote as well. I dont know what the points setup is on this type of motor either but worn or improperly gapped points are another common spark weakener. Not a factor if electronic.

Cold fuel won't atomize as well producing a lean mixture that is hard to light.

The idle jet would be suspect but you've cleaned the carb properly and it runs well warm.

Better spark could mean better starts.
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Old 04-07-2012, 09:52   #9
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Re: Cold-starting O/B

I had a hard starting problem some time ago. It was eventually traced to a faulty "kill switch" wiring issue. We'd have to pull the darn thing 60 (!) times to get it going. Now, no problems at all. Check everything out carefully. Evinrude 1990 2 stroke 9.9 hp.
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Old 04-07-2012, 10:07   #10
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Re: Cold-starting O/B

Quote:
Originally Posted by Ex-Calif View Post
These engine apparently have a reputation for this but improving the spark quality is my vote as well. I dont know what the points setup is on this type of motor either but worn or improperly gapped points are another common spark weakener. Not a factor if electronic.

Cold fuel won't atomize as well producing a lean mixture that is hard to light.

The idle jet would be suspect but you've cleaned the carb properly and it runs well warm.

Better spark could mean better starts.
Don't know which model he has. My 2CMH Yamaha has CDI ignition. No points, fixed coil-to-flywheel setting. Stop switch is the red plastic "Y" on the tiller. Direct drive.
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Old 04-07-2012, 10:52   #11
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Re: Cold-starting O/B

Beginning to sound like an old Classic Motorcycle thread,,finicky carbs at low temp.
I used to get around the problem by using a blow dryer on the motorcycle carb in the mornings, yes i know its not a Motorcycle,,but it is out in the weather all the time just like a Motorcycle.
I would either use a little shot of ether before starting, or increase spark value with a high performance coil.
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