1971 9.5hp sea horse - idling issue

Andre

Seaman
Joined
Jul 19, 2006
Messages
55
It's been awhile since I last posted on this site but I must say it's the best out there.

I just got into fixing a used motor I picked up for my daughter and it's got an issue iding slow. I cleaned the carb and yes the fuel pump and it still is doing the same thing as before. The bulb stays firm when it's running and makes no differance to the performance of the motor so I can rule that out too.

This narrows it down to either points or the plugs. I am about to purchase new plugs because I'v read the B8e's are the wrong ones. I'll get some champian J4c's and see how that goes. B.T.W. the plugs were really wet and black as if it's running really rich. I've set the low idle back to 3/4 and it seems to have no effect.

I'll post back on the plug replacements to let you know how that went.

Andre

PS: for all you folks that played with the fuel pump. words of warning.

only unscrew the two long screws which hold the pump to the motor. The other two will keep it together until you get to the work bench. When you remove the other two screws hold it together firmly or it will spring apart on your. Note all the orientation of the parts as you take each layer apart.

There are two prints (one large one and a smaller one) Each spring have a plast cap which should fit against the rubber membrane as you put the together.
 

tashasdaddy

Honorary Moderator Emeritus
Joined
Nov 11, 2005
Messages
51,019
Re: 1971 9.5hp sea horse - idling issue

i really do not understand the issue. a iittle clearer.
 

Andre

Seaman
Joined
Jul 19, 2006
Messages
55
Re: 1971 9.5hp sea horse - idling issue

The issue I am having is that the motor starts up fine but as soon as I lower the RPM's it will just quite. Nothing I can do will get it to stay running a low RPM's.

I cleaned the carb, fuel pump, new premium gas (which I found water in originally) and plugs. I could only get the same NGK brand.

So after doing the easy stuff I lifted the flywheel and noticed the that coils were cracked to the point I can see the metal windings. They look like the original pink coils. The points looked clean and I suspect the condensors are good too.

At this point, I am about to replace the coils as they look like they need to be replaced due to the visable cracks.

Andre
 

Rick.

Captain
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Jul 30, 2006
Messages
3,740
Re: 1971 9.5hp sea horse - idling issue

Changing coils is a good choice. Clean the points and re-gap them @.020. Did you put a carb. kit in it or just clean the carb.? The reason I ask is if turning the slow speed needle makes no difference something is either dirty, worn out (needle) or perhaps leaking air (packing). Rick.
 

Andre

Seaman
Joined
Jul 19, 2006
Messages
55
Re: 1971 9.5hp sea horse - idling issue

I put in a new carb kit last year so hopefully that isn't the issue now. The motor wouldn't idle long enought or slow enough for me to really tell if the slow adjustment made any differance. As for the compression test, I just can't find the compression test tool so I'll have to go without that one for now. If I am changing the coils can I assume the condensors are ok?

B.T.W. I did located a couple original OEM coils at my local marina today so I can at least give that a shot. I know it a $70.00 guestimate but they look like it's time to be replaced regardless (coils dated May 6 1971).

Thanks for the point gap info, I'll do that too.

Andre
 

Andre

Seaman
Joined
Jul 19, 2006
Messages
55
Re: 1971 9.5hp sea horse - idling issue

I just missed the point you made on repacking if the needle is leaking. What do you mean by that and how can I perform the required repair?

Thanks for that suggestion. If the coils don't pan out and I go back to the carb to troubleshoot, I would like to look at that suggestion too.

Andre
 

Rick.

Captain
Joined
Jul 30, 2006
Messages
3,740
Re: 1971 9.5hp sea horse - idling issue

Andre: The packing I mentioned are small washers that fit around the slow speed needle which are compressed to form a gasket around the treads. If your carb. kit was last year then they should still be in good shape. The needle packing nut needs to be tightened just enough so the needle can be turned but that it is not loose. Many auto parts stores will lend you a compression guage. Rick.
 

ezeke

Supreme Mariner
Joined
Sep 19, 2003
Messages
12,532
Re: 1971 9.5hp sea horse - idling issue

The packing on the later 9.5 like yours is a simple 0-ring held in place by metal washers with a spring for tension.
 

Andre

Seaman
Joined
Jul 19, 2006
Messages
55
Re: 1971 9.5hp sea horse - idling issue

ok - with new coils installed (as per the secret notes of the site), points checked at 20 and flywheel tightened to 40 foot pounds the motor started up fine. Idles much better than before even with the cooler NGK plugs.

I'll see how things go over the next few weeks.
Thanks all,
andre
 
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