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 Catalina/Capri 25/250 Sailor's Forums
 General Sailing Forum
 If you own a Yamaha 8HP motor...		  New Topic  Topic Locked
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kevinmac
Admiral

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USA
732 Posts
Initially Posted - 01/15/2006 :  15:47:58  Show Profile
If you read the 250 forum, you may have read that my new 8HP Yamaha outboard was having trouble idling. I have since had the dealer look at it. He increased the idle speed, and also ran the motor at high RPM a bit, speculating that there was oil on the plugs. (This motor has about 30 minutes of time on it, plus whatever test running the dealer did).

Now that he has done that, the motor works as I would expect. I neutral, the idle is a little fast, but in gear the idle is slow speed I have experienced on other motors. So, problem solved, I guess.

The question I have for you is, in order to get this smooth operation, I have to run the motor for about 3 - 4 minutes to warm it up (with the choke closed almost all of that time, just open for a few seconds to start it). This is on a 45 degree (air temperature) day. Do you find it normal with your motor on a semi cold (but not really cold) day to have to warm it up for this period of time?

During the warmup period, I slowly reduce the RPM from the start position, but can't get it all the way to idle until the 3 to 4 minutes has elapsed.

Please let me know what your experience with this motor has been. Thanks!
Kevin Mackenzie
Former Association Secretary and Commodore
"Dogs Allowed"
'06 C250WK #881
and
"Jasmine"
'01 Maine Cat 30 #34
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At Ease
Admiral

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672 Posts
Response Posted - 01/15/2006 :  18:01:15  Show Profile
Don't have an 8 hp Yamaha now, but did have one for four years. Never had the warm up problem you mention. The only problem I had was, at times, if not fully and properly primed, it had difficulty starting.
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tinob
Master Marine Consultant

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USA
1883 Posts
Response Posted - 01/15/2006 :  23:06:22  Show Profile
Kevin, don't have Yamaha but I noticed the same peculiarity on the new Nissan 9.8. I thought it strange, water temp was around 60, didn't think it should require such a long warm up. The old Johnson started on choke and then was run without in perhaps 15/20 seconds.

Might be four stroke characteristic.

Val on the hard DAGNABIT # 3936
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Notice: The advice given on this site is based upon individual or quoted experience, yours may differ.
The Officers, Staff and members of this site only provide information based upon the concept that anyone utilizing this information does so at their own risk and holds harmless all contributors to this site.