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Old 09-25-2021, 08:00 PM   #1
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Default MercCarb replacement

I have a 2001 3000 scr with twin 5.0 liter with 2 barrel MercCarb's on them. Both carbs have been rebuilt and tweeked over the pasted 5 years and I still have problems with hesitation and just poor performance. I figure after 21 years they are in need of replacement . I am looking into replacing them with 2 barrel Rochester compatible carbs from a website called i-5automotive.com. They are $345.00 a piece compared to around $820.00 for mercury replacements.

My question is: has anyone done this to their 5.0 liter engines. The website says that the Rochesters are bolt on ready to roll. Are there any others places that offer a replacement for these MercCarbs?

Thanks

Roger
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Old 09-26-2021, 12:36 AM   #2
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Are they Marine carbs? Who rebuilt yours? I just rebuilt the carb for my 30 HP Johnson and the key is being sure to clean all the small passages. I did this using very fine pipe cleaners for carbs and several hours in my Ultrasonic cleaner filled with a carb cleaning solution. Reassembled the carb and the outboard fires on the first pull.
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Old 09-26-2021, 03:27 PM   #3
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A certified mercury mechanic did Mike. Yes go to www.i-5automotive.com and they have a marine carburetor section. I'm still up in the air if I'm going to go with new carbs. I'm moving to a new marina next year and that might mean a new certified mercury mechanic lol.

I was curious if anyone had ordered one of these merccarb replacements and good or bad results.

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Old 09-26-2021, 04:55 PM   #4
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Roger I donít have any experience with them to provide an input. You may want to post on another site that has a larger group as you might have a better shot on getting feedback about them.
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Old 09-28-2021, 12:05 PM   #5
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I’ve rebuilt mine at least 4 times in the past 20+ years. Mikes carburetor parts has videos as well as kits. I went to the 4bbl edelbrock 1409 when I had to replace one of the mains, so no experience with the Rochester carbs you mentioned.
I would have stayed with the original setup, but 2bbl wasn’t available at the time.
The Mercarb are super simple, so a good rebuilt will be as good as anything new.
Key is really cleaning them well. I use a ultrasonic tank with carb clean and cook them after disassembly twice.
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