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Carb cleaning???

R

Retired OG

Contributing Member
I'm not holding out much hope, but does anybody have a special brew they use??? I'm finding the new environmentally friendly concoctions aren't as good as the "old school" types we used to use...Suggestions??? It's for my 1972 Evinrude.
 
racerone said:
What motor and what is the motor doing / not doing that leads you to carburetor issues ?
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It's a 1972 Evinrude 50 hp Lark....the engine is now "surging"....it was running a little rough before....I've had the carbs off about 6 times since rebuilding them last year. Most recently to replace the reed valve gasket because it was spitting fuel out the throat....Since I'm gonna have to replace the gaskets, I want to tear them apart again and see if a more thorough cleaning will smooth out the low speed idle a bit.
 
Retired OG said:
It's a 1972 Evinrude 50 hp Lark....the engine is now "surging"....it was running a little rough before....I've had the carbs off about 6 times since rebuilding them last year. Most recently to replace the reed valve gasket because it was spitting fuel out the throat....Since I'm gonna have to replace the gaskets, I want to tear them apart again and see if a more thorough cleaning will smooth out the low speed idle a bit.
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I've used a product called Techron to sort out carb problems. Just add it to your fuel and run your engine a-bit. Friends of mine have had good luck with it too. I add a container to my automobile twice/year. It's made by Chevron and available in most auto parts stores.

Bill
 
There is no mechanic in a can to fix carb problems. Fuel additives are better as preventetive measures. Gunk makes a really good product for soaking carbs. I have also used sea foam to soak carbs.
 
flyingscott said:
There is no mechanic in a can to fix carb problems. Fuel additives are better as preventetive measures. Gunk makes a really good product for soaking carbs. I have also used sea foam to soak carbs.
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I agree....I think I'll try the Sea Foam soak, followed by a boiling with water, followed by another soak.
 
Any other trouble shooting done ?-----If you have had carburetors apart 6 times then maybe the problem is elsewhere.-----Compression test done ?
 
flyingscott said:
There is no mechanic in a can to fix carb problems. Fuel additives are better as preventetive measures. Gunk makes a really good product for soaking carbs. I have also used sea foam to soak carbs.
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I have only used lacquer thinner to clean carburetors. Just make sure the lacquer thinner doesn't come in contact with any rubber parts or it will ruin them. As far as Techron is concerned a friend added some to the fuel in his chain saw that was running horribly. It's running fine now and he's never removed the carburetor since. Choose your poison. There's a fellow in Long Island, New York who makes motorcycle carbs run like new. He utilizes, among other things, ultra sonic cleaning. Just F.Y.I.

Bill
 
If it is still spitting fuel out of the carbs thats a classic reed valve failure. Did you surface the flange on the carb and install a new gasket when mounting the carb?
 
kimcrwbr1 said:
If it is still spitting fuel out of the carbs thats a classic reed valve failure. Did you surface the flange on the carb and install a new gasket when mounting the carb?
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It's no longer spitting, reed valves are fine....and I haven't had the carbs apart several times...I only had to remove them in order to address other issues..
 
Gunk makes a gallon can with a basket for small parts. I've only used it for my Tohatsu 6hp, but that carb needs frequent cleanings. The hard plastic stands up to a 4 hour soak. Overnight might be too long, I've read that aluminum will begin to etch. It seems to work well. Ultrasound is always good.
 
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