1974 70 HP Evinrude Carbs

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wrmdunker

Petty Officer 2nd Class
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Sep 17, 2010
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Had a bit of motor trouble at the end of the season. Seemed like the carbs or a carb was flooding. Good idle but when I put it in gear and tried to throttle up, it was bogging down. If I kept forcing it, it eventually "cleared" and would speed up and get on plane. This happened at times, and at other times started and ran up to speed fine. Other times when this acted up, I would shift to neutral, raise the RPM with the warm-up lever until it responded cleanly and then shift and take off.

Had an OMC shop squeeze me it to take a quick look. Spark and compression are fine. We took the boat to a local launch ramp and submerged the lower unit while still on the trailer. Shop owner (30 years in the business) ran it at what I would think was close to WOT and it ran and shifted fine. Power pack, coils and stator, fuel pump have all been replaced recently so the mech thought it might be dirty carbs. I have the time and like a challenge so I bought the kits. Sierra with the floats but know the cork floats are long ago replaced but not much cost savings w/o the floats.

So I get to pulling the carbs today. The sheet that comes with the kits doesn't say much. Clean it, adjust float, re-install in reverse....... I don't have experience so could use the advice of those that have.

Looks like 3 core plugs. Should I remove all 3? What tools and techniques are appropriate? Two on top


IMG_1340.jpg


One on the bottom facing the bowl

IMG_1341.jpg


I removed the high speed jet with a narrow screw driver

IMG_1342.jpg


Pic showing the nozzle and orifices

IMG_1343.jpg



These all show the top carb. Looks pretty clean to me so far as I have not started to clean it yet. Maybe I'll see more issues in the other 2. Please feel free to comment on any items regarding cleaning and re-installing. I have bookmarked a post regarding the link and sync and will be looking to make those checks later. Or, am I off-track and my running ploblems may be something else.........?????

Thanks to all in advance.

WD
 

boobie

Supreme Mariner
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Nov 5, 2009
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Re: 1974 70 HP Evinrude Carbs

Maybe you should stick with one post as it gets confusing.
 

wrmdunker

Petty Officer 2nd Class
Joined
Sep 17, 2010
Messages
170
Re: 1974 70 HP Evinrude Carbs

Not my intention to post twice. I tried to change the title from 1977 to 1974 and then the posts were all mixed up. Sorry. I will try to delete this one.


Please comment to the other post.Moderator, can you delete?
 
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