The Carb's Apart - Couple of Questions

[guy74]

Re: The Carb's Apart - Couple of Questions

Interesting....... Makes one wonder why it isn't shown in the BRP diagrams. What manual are you referring to? Just curious.

Clymer Evinrude/Johnson outboard shop manual 48-235hp 1973-1990. It has a good picture of the bottom side of the carb. It also shows a screen in the vent opening, I have also worked on this type of carb before, I just looked it up to refresh my memory and make sure I was thinking correctly. I'll try to scan and post the picture.

 

[guy74]

Re: The Carb's Apart - Couple of Questions

Here is the page.

 

[Theoutdoorsman]

Re: The Carb's Apart - Couple of Questions

Here is the page.

This is very weird........ .......... I'd like to hear from someone with an OEM Service Manual on this to see if their's confirms this. It's odd that NONE of the diagrams for Johnsons, in that year, depict a core plug in that particular location........ huh? Your aftermarket manual covers 48 hp - 235 hp outboards. He is working on his 1985 Johnson 30 hp. However, the carb does appear to be the same general make. Very odd.


Quick question for ya Shawnswan......... I'm guessing you were having trouble at an idle but ran reasonably well on top end........correct?

 

[guy74]

Re: The Carb's Apart - Couple of Questions

If memory serves me right, 18 thru 75hp motors use a very simular carb in those years. They use the same kit.

 

[shawnswan]

Re: The Carb's Apart - Couple of Questions

Thanks guys!! Guy74, thanks for that scan!
Yeah, I'm having trouble at idle. It'll run for about 5 min. then start to sputter, then die. Sometimes when I have it wide open going across the lake then engine will stall out on me, Then it's practically impossible to start or keep going without someone manually pushing on the throttle plate.
I'm hoping this carb rebuild solves the problem.

 

[Benny1963]

Re: The Carb's Apart - Couple of Questions

i have the clymer manual it also shows a plug in that hole

 

[shawnswan]

Re: The Carb's Apart - Couple of Questions

Well, I hope the plug was supposed to be there, 'cause it's in now! I'll let you guys know on sunday how it worked.
Thanks again for your help.

 

[Randyg123]

Re: The Carb's Apart - Couple of Questions

$0.02

I'd go with what the OEM manual says over the aftermarket manual that doesn't even cover the engine you are working on.

I have a Clymer's and an OEM. Many booboos and misleading info in the Clymer's.

 

[Theoutdoorsman]

Re: The Carb's Apart - Couple of Questions

Well, I hope the plug was supposed to be there, 'cause it's in now! I'll let you guys know on sunday how it worked.
Thanks again for your help.

Worst case cenario, you'd have to remove the carb and pull that core plug back out. No biggy. I'd have probably installed it too, IF, it had idle jetting in the bottom of that hole. That being said, I wouldn't hesitate to pull it out if it didn't idle and run perfectly. A lean condition is nothing to take lightly. It can cause some serious damage. Do get back with us, I'm really curious now. BTW, you never elaborated on the symptoms that led to the carb rebuild in the first place. I'm also curious on that as well.

 

[samo_ott]

Re: The Carb's Apart - Couple of Questions

If I'm not mistaken, the exploded diagrams refer to them as "core plugs". The welch plug (freeze plug) is the quarter sized plug usually located between the heads and atop the block, which has a serial and/or model number stamped on it, and is used to identify the powerhead......... correct?

Wait a sec, I was just looking at a parts diagram of my early 7.5 and in the diagram they call the plug a welch plug. (on top of the carb)

 

[shawnswan]

Re: The Carb's Apart - Couple of Questions

Well, I ran it twice on the weekend and no problems....knock on wood.
When I put the cap on inside where the float is, I noticed there's a hole that bypasses the cap and runs near the center pin. So by adding the cap I guess it just redirects to that hole. Picture attached.

My problem with the motor was that it wouldn't idle for more than 5 minutes without stalling. When I did get it out, it would stall when I had it wide open anywhere from 5 to 10 minutes (not all the time though). When it did stall the only fix was to push on the throttle pin with someone else starting it. Then have them put it into gear and drive with me holding the throttle pin half way down. I'm assuming the engine was flooded. A couple of weeks ago, after running it a while, leaving it for 10 minutes, it wouldn't start. It took forever to get it going.
This is a new problem that just started this year. When I took the carb apart and saw the unpunched welch cap sitting in the bottom of my float bowl there was also a red gasket sealant. I'm assuming that the guy who did the last rebuild (1 year ago) put the sealant in and forgot to punch the cap. The sealant must have held last year but let go this year.

Thanks for everyone's help!

 

[Theoutdoorsman]

Re: The Carb's Apart - Couple of Questions

Glad you got it running shawn. Thanks for the update......... ALAN

 

[guy74]

Re: The Carb's Apart - Couple of Questions

Thanks for the update, Shawn. It's good to hear that it worked, alot of people never lt us know how it turns out.
Thanks,
Brian