Nasty carb pics-Before & After!!

This was the first order of business that I took care of after my purchase. Completely disassembled the carb. Cleaned every thing inside and out. It's like maple syrup rock candy, very hard. Used most of a can of carb cleaner!

Looks really good. You're still not outta the woods, just yet. First order of biz...unscrew the jet holder from the carb body. It is also the emulsion tube. Once it's on your bench, you need to run a thin wire through each & every orifice...nothing else will suffice. This is the most critical part inside these carburetors and getting those minuscule orifices 100% squeaky clean & unobstructed can make the difference between sweet success and bitter frustration. Next up, the petcock assembly. The entire assembly is still available, new. If you're skilled with tapping holes, the rivets can be carefully drilled, the holes tapped for M3 screws and just the packing washer can be replaced. Don't be surprised if the rubber has turned crunchy...in which it won't seal.

I don't see the fuel inlet & filter screen. Plan on cleaning that area then replacing the screen and O-rings.

Lastly, verify that all the fuel & airbleed passages are clear. For this purpose, as well as a final cleaning, carb cleaner is ideal. Judging by the lack of pitting and tiny bit of iridited finish remaining inside the float bowl, I am optimistic about this carb rebuild turning out well.

Looks great from here.
I don't think I've ever seen a carb with stalactites in it before.lol

I must say I was just a little shocked at what I say when I opened the float bowl from the main carb!

I did have the petcock disassembled, it had screws holding it together, no rivets, cleaned in there too. Had the strainer and strainer bowl out too. All were nasty. Blew carb cleaner with the straw attached threw all the little passages until it came out the other end. Then finished with compressed air and a piece of 20 lb fishing line to clean and poke through the passages. Also bought 2 new Honda jets and a new float needle valve. It was about a 6 hour process.

Sounds very good, thorough

What about the emulsion tube?

I purchased a ultrasonic cleaner from harbor freight and you add a 25% mix of pine sol and run it for about 90 min and they come out looking new.

I wish I had one of those! I’m sure it would have been easier. We don’t have harbour freight in Canada. There’s another store up her called princess auto that I think is similar, I should check it out.

Can't you order one online?

If I come across a carb in this condition again, it would definitely be a solid investment. Save a lot of time and effort too by the sounds of it. I did look online, shipping and exchange rate would make it a bit pricey.

How about this:

https://www.amazon.ca/iSonic-P4810-...7456&sr=8-3&keywords=ultrasonic+cleaner+P4810

Or this:

https://www.amazon.ca/iSonic-P4820-...27927&sr=8-1&keywords=ultrasonic+cleaner+4820

I'm definately putting one on my wish list. Thanks.

fatcaaat said:

I purchased a ultrasonic cleaner from harbor freight and you add a 25% mix of pine sol and run it for about 90 min and they come out looking new.

Click to expand...

Pine-sol is magical.

Adding in pictures of a set for motivation:

Before and almost done pics

Definitely a big improvement! What did you wind up using to clean them? Ultra-sonic cleaner, pine sol? What bike did those carbs come off?

BTW, the carb in the first pictures I posted on this thread a couple of years back went into my 1983 with an SL-70 4 speed engine. Works great.

MountainMini said:

Definitely a big improvement! What did you wind up using to clean them? Ultra-sonic cleaner, pine sol? What bike did those carbs come off?

BTW, the carb in the first pictures I posted on this thread a couple of years back went into my 1983 with an SL-70 4 speed engine. Works great.

Click to expand...

I used my ultrasonic cleaner. Added in a little surfactant that I had handy (used with the lawn sprayer) and some dish soap. Went looking for the PineSol in the laundry room but we were out. Next time I’m going to give it a try. I picked up two sets of carbs for a CB77. The ones in the picture were the worst.

Is there any additive we can add to the fuel every now and again that cleans the carb as we ride ?

scooter said:

I used my ultrasonic cleaner. Added in a little surfactant that I had handy (used with the lawn sprayer) and some dish soap. Went looking for the PineSol in the laundry room but we were out. Next time I’m going to give it a try. I picked up two sets of carbs for a CB77. The ones in the picture were the worst.

Click to expand...

PineSol does a really good job. I buy the really big bottle. Then I fill a container just enough so I can submerse the entire carb in it. I check it after about an hour, don’t let it sit too long. Then it usually only needs some light brushing with a toothbrush or similar. For the really nasty stuff I use carb cleaner spray. Wear your eye protection too! Then I use compressed air to blow out all the passageways. More specifically I thread one of those needles you use to inflate footballs etc into my air gun. This works great.

RMHRC said:

Is there any additive we can add to the fuel every now and again that cleans the carb as we ride ?

Click to expand...

IMO, it’s the sitting of old fuel in the carb that causes all the problems! If my bikes are gonna sit for more than about 2 weeks I turn off the fuel valve and drain the carb.

I’ve had great success with “Techron” by Chevron as a fuel cleaner additive. It cleared a plugged jet on my daughters Ninja 250. It would only run with the choke on at idle. When you got it up to speed you could turn the choke off. Added Techron and we went for a couple hour ride and everything started working as it should again. You could idle it with the choke off again after warm up.

Here’s a couple of pics. This is what I use to clear the passageways in my carbs after cleaning.