1997 Johnson 15 hp dropping a cylinder??

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fleetwin
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Re: 1997 Johnson 15 hp dropping a cylinder??

Postby fleetwin » Tue Apr 03, 2018 6:48 am

Richard, I spoke with Dan last night...
He says you check resistances on the coils, and all is OK...
So, we need to review our test results. Yes, I realize that just because coil resistances are OK, does not mean the coil is OK...But again, I don't think that cracked potting is anything to worry about.
I just want to review what you posted and make sure I have it right....
Your engine sparks on the lower cylinder #2, but there is no spark on the upper cylinder #1, do I have it right?
I recommended that you swap the coil primary leads on the coils, put #1 orange pack lead on the lower cylinder and vica versa...Leave the plug leads alone/do not swap them...
I think you said that with the coil primary leads swapped, the #2 coil/cylinder still sparked, and the #1/top cylinder still did not fire....Do I have this right? If so, this tells me that both powerpack primary leads had juice/fire when connected to the lower/#2 coil. This would indicate a problem with the #1 coil/ground/plug lead...
If I have it wrong, let me know...
Don

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Richard A. White
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Re: 1997 Johnson 15 hp dropping a cylinder??

Postby Richard A. White » Tue Apr 03, 2018 11:06 am

Hey the light just came on...lol
What you called the coil primary leads is not what I thought you meant, so I will test again this evening and message you with the results since it is such a new motor, I don't want to offend anyone...LOL

Thanks for the help

Richard A. White
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fleetwin
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Re: 1997 Johnson 15 hp dropping a cylinder??

Postby fleetwin » Tue Apr 03, 2018 11:44 am

Can't offend me, you can even call if you like...

Don
Last edited by fleetwin on Wed Apr 04, 2018 12:03 pm, edited 1 time in total.

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Richard A. White
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Re: 1997 Johnson 15 hp dropping a cylinder??

Postby Richard A. White » Tue Apr 03, 2018 11:52 am

Don,

I have skills in the being offensive department....lol

Richard A. White
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Richard A. White
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Re: 1997 Johnson 15 hp dropping a cylinder??

Postby Richard A. White » Tue Apr 03, 2018 3:54 pm

Ok, so I swapped the orange wires from top to bottom, no change, in fact I have no spark at all right now...So I gotta check kill circuit

Richard A. White
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Richard A. White
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Re: 1997 Johnson 15 hp dropping a cylinder??

Postby Richard A. White » Mon Apr 16, 2018 1:20 pm

Update for those that care, thanks for all the help, especially Don and Dan, runs wonderful now, owner realizes his boat is too small for this motor..LOL said it scared him...Power pack was bad

Richard A. White
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Mumbles
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Re: 1997 Johnson 15 hp dropping a cylinder??

Postby Mumbles » Mon Apr 16, 2018 1:39 pm

Richard A. White wrote: owner realizes his boat is too small for this motor..LOL said it scared him.


That's what I've said before, they pack a lot of power in a small package! :D

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Re: 1997 Johnson 15 hp dropping a cylinder??

Postby PugetSoundBoater » Mon Apr 16, 2018 9:51 pm

Mumbles wrote:
Richard A. White wrote: owner realizes his boat is too small for this motor..LOL said it scared him.


That's what I've said before, they pack a lot of power in a small package! :D


Mumbles has a video of him running a 15hp at about 4500rpm,about the same top end as a 9.9,he then takes it to full throttle about 5500 rpm ,and thats where the additional 5 Hp kicks in.It breaths better with the less restricted exhaust and the bigger carb throat than the 9.9 as i understand it.
I have a '89 15 ,seems like more than 5 hp at the top end.
"We only learn in two ways,one from reading,the other by association with smarter people" Will Rogers


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