BoseMensch

So I picked up a project 91 CBR600F2 for $600, and am in the process of cleaning the carbs out. Problem is that the main jets and slow jets are totally plugged with some kind of grime. I let em soak overnight in gumout carb cleaner, but that did nothing. Also, it looks like that may have had some kind of reaction, because all the brass turned green. I'm hesitant to poke anything through there for fear of screwing them up, and don't want to keep soaking em in gumout because of the apparent reaction. Also, on two of the carbs the passages from the slow jets and main jets into the carb throat appear to be similarly blocked because the carb cleaner won't spray through. Any suggestions on clearing those blockages?

Thanks in advance everyone!

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NoChickenStrips

I just used guitar string to clean mine out. Poke it with out scratching the brass and wiggle the wire. Dont keep poking in and out.

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RedKat600

Get a can of Berryman's Carb dip, put all non-rubber parts in there and let them sit for 24 hours. I'll show you the difference and how well it works. I'm not familiar with Gumout, but Berryman's is tried and true.

Before:





After a soak in Berryman's!

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BoseMensch

Thanks guys! I wasn't sure if a guitar string would mess things up. And that berrymans stuff looks like miracle sauce! Wow! I'm definately getting some. Thanks again for the super quick replies! Have a great Sunday!

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RedKat600

I recommend NOT using a guitar string unless it's plastic. Avoid metal strings, as they can make the jet larger. Get yourself some heavy monofilament fishing line and use that if you need to poke a hole in the sludge, but I prefer to just dip and forget. The plastic line won't mess up the holes in the jets.

Also keep in mind when you dip the carb it needs to be completely disassembled......no rubber parts, no jets installed, bare body and a pile of parts. The pics I took were after I put it back together.

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nsrg500

Go to your local drug store and get Dental floss for cleaning under bridges.
It's long piece of hardish string with a thin felt like stuff. The stiff part is good for pocking through small spaces and you can soak it with your favorite carb cleaner.


Works great on mains. If it's too big for pilots I pull one wire out of a multi strand speaker wire and use that. Brass on brass, less chance of scratching the jet.

P.S. You can also pull a thread of a broom if you need a thin piece of plastic type of something. They can get frayed so it's easy to split it into something very thin.

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dragracer1951

No guitar strings
I've been known to use brass wire though
And when you put a carb into berrymans, two things...
Make absolutely sure you've removed all the rubber parts. They aren't easy to find...
And, don't get any of that stuff on you.
You'll never get the smell off

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RedKat600

They have changed the formula in recent history. It's now a nice, deep brown color with almost no odor at all. The last can I bought really surprised me!

The first time I bought it it looked like antifreeze and stunk to high heaven! Not anymore.

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james1300

Use Gloves (Nitrile) and Eye protection. Berrymans is THE stuff!
Don't let it get on any painted surfaces.

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moparmiller

Propane torch. Hold the dry jet with pliers and torch it until the varnish boils out. Hit it with a blast of shop air when it is still hot and you are done.

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rotordrvr

$49 ultrasonic cleaner from ebay. get a 2 qt one. cleans anything without harsh chemicals and you can use it over and over. I use water/vinegar/simple green solution in mine, sometimes stoddard solvent. makes short work of gunky carbs and little bit and won't harm plastic/rubber parts.

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demologik

This is exactly what I've been searching for on my 91 f2.. Constant bogging especially at full throttle. Thanks. Got any tear down tips/ pix to help assist me?

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nsrg500

Just Goggle it and you should be able to come up with a ton of INFO.
It's not a hard job.
Pull the carbs and place them on a nice clean table. Remove the bowls,jets,slides, emulsion tubes, and clean every thing. Then when you're all done, do it again.
I use Qtips to clean inside fuel, vac hoses, compressed air to clear holes. Maybe some carb cleaner. Soak the bodies and blow em out, just get em clean. Use the Bridge type Dental floss like I said up there^ to clean jets. Spray some cleaner on it and pull it through till it comes out clean......blhablahblah I could but wont go on and on.

You will learn a lot as soon as you get those bowls off.
Don't forget to check out your fuel tank/replace fuel filter, might have lots of crap in it.

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jnicola

Jet's are $5 a piece if you know the correct jet size, sometimes less. Spend the $40 to start over and get some piece of mind. Clean the rest of them up while you're in there. Also add another small washer under your needles of equal thickness to the OEM one and you raise the needle the equivalent of a half step. Apparently that's the most common jetting fix for exhaust systems on these bikes and/or K+N air filters, as preached to me by countless old racers.

Good luck. F2's are fun bikes and not that hard to troubleshoot. Next most likely culprit for trouble would be the R/R.

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nsrg500

OK take the easy way out.


Good advice there^^

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dragracer1951

Strip one carb at a time
That way, when you forget where the jets go, you have an example

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dwh4784

Another vote for replacing the jets. Does DynoJet make a kit for it?

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jnicola

The dynojet kit runs $125 and includes a variety of parts that you probably don't need, again though this is according to old timer racers and they're simple jetting fix technique.

It's an old bike, just slap the best priced but still good shit in it that gets it running at 99% and spend the savings on gas to go ride.

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CB1000work

You can order new jets through Jetsrus.com by bike model, good guys to deal with.

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demologik

well i ended up ordering a jet kit.. I'm a complete newb mechanically with bikes, and this looks discouraging for me to try.. mostly just scared of messing something up..

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