Barn find CARB ISSUE - Frozen slides

[Peder_y2k]

Working on my barn find not run for 22 years, found the 2 Mikuni carburetor diphragm slides fozen in their bores. Soaked in WD40 for 2 days and still firmly stuck. Only 2K miles on the clock so it all looks new under the skin, so I don't want to use mechanical methods that could easily destroy the fragile plastic-like piston.

Any suggestions how to unstick the slides without wrecking them?

 

SEAFOAM DEEPCREEP, penetrating oil, Marvel Mystery Oil, carb cleaner spray.............. I'm open to help here.

 

-Pete, in Tacoma WA USA

[Condor]

 

SEAFOAM DEEPCREEP, penetrating oil, Marvel Mystery Oil, carb cleaner spray.............. I'm open to help here.

 

-Pete, in Tacoma WA USA

 

They're probably glued in there from dried varnish. Personally I'd remove the covers and lift up the diaphragms and fill the cavity with Sea Foam and let them soak.... Sea Foam makes short work of varnish. Another possibility would be to find a place with a big enough ultrasonic cleaner to take the set. I know it's expensive but considering the alternative??

[bongobobny]

If the sliders are stuck there is most likely more than that to fix, i.e. disassembly and soak everything and plan on replacing stuff! Maybe you can find a good bank of carbs on Fleabay...

[Yammer Dan]

Jacks idea may work. If you could soak them. Be carefull what they soak them in. Some stuff just too harsh. Wally World sells BerryMans by the gallon now.

[VentureYZ]

I have a pretty good size ultrasonic if you want me to soak them. I will need dimensions to make sure they will fit. Maybe remove bowls and floats to reduce size. Let me know Mike

[Peder_y2k]

I have a pretty good size ultrasonic if you want me to soak them. I will need dimensions to make sure they will fit. Maybe remove bowls and floats to reduce size. Let me know Mike

 

Mike, thanks for the offer. I'll consider it. Waiting for results of soaking with "PB Blaster"

 

-Pete, in Tacoma Wa USA

[utadventure]

When you do try moving the slides....do it from the inside of the carbs by prying outward.

 

Pulling or twisting can result in a broken slide....experience is a cruel teacher.

 

Dave

[Hotrod]

I read on another forum where a guy used pine-sol, about 3 big bottles, and soaked his carbs in a dish pan. Used it straight and enough to completely cover carbs.Let soak for a couple days and see if it will dissolve the varnish. He said it worked very well and would not hurt the rubber or plastic.I have not personally tried this,but seems like it would work.It comes in a plastic bottle, so you know it will not harm the plastic.

[Black Owl]

My suggestion, for what it's worth. Soak them in tranny fluid.....

[Bob Myers]

Buy a gallon of cheap lemon juice, put it in a pan and put it on the stove. Bring it almost to a boil and ease the carb down in there. keep it just at a light boil for a few minutes, pull them out and rinse 'em off. I have seen this make stained dirty carbs look new, and other not so new, but clean.

[theportunionkid]

i've had good luck with yamalube card cleaner dip about $15 a qt but u mix 3 to 1. directions say with water had young mechanic from shop it say works well with water had old school mechanic 30 yrs yamaha shop said mix with gas was the label insrtuction back in the day. i went old school bought 2 qts and plastic box just big enough to fit carbs in and dipped all. did not put diaphams in though.

[MiCarl]

You need to make sure the needles aren't stuck in their jets or you can pull the needle through the bottom of the slide. Pull the main jet and needle jet out the bottom of the carbs. Spray just a bit of carb cleaner in there.

 

I have had luck prying stuck slides up by hitting them with a shot of carb cleaner (through the bore, not under the diaphragm) and prying up gently with the handle end of a small screwdriver. Sometimes it takes a few squirts before enough cleaner wicks up through the varnish to break them loose.

 

After they come out dry off the diaphragms to minimize any chance of the cleaner damaging them.

[Peder_y2k]

My suggestion, for what it's worth. Soak them in tranny fluid.....

 

I've created home-made penetrating oil from a mix of tranny fluid and acetone. Might try it if the PB Blaster doesn't work.

-Pete, in Tacoma WA USA

[Condor]

I've created home-made penetrating oil from a mix of tranny fluid and acetone. Might try it if the PB Blaster doesn't work.

-Pete, in Tacoma WA USA

 

After seeing what DOT3 does to paint I wonder what it mixed with acetone would do???

[Flyinfool]

Seeing as how we are trying to get a plastic slide unstuck, and knowing what brake fluid does to some plastics, I think I would pass on that one.

[Condor]

Seeing as how we are trying to get a plastic slide unstuck, and knowing what brake fluid does to some plastics, I think I would pass on that one.

 

I know it all depends on the plastic, I have messed up the paint over the ABS and it has only removed the paint. Nothing to the plastic. But you're right. Maybe a test spot...??

[van avery]

I use Brake cleaner to remove a stuck needle valve. Other things were not working.

Good luck

[dacheedah]

I remember using hot pinesol in water and a circulating pump. pull the bowls and give them an overnight soak, rinse in hot water and blow dry.

[Huggy]

My 86 had sat for 11 years when I got it and I just soaked slides with Kroil, I swear by the stuff.

Let it sit and just gave the slides a slight pry with a piece of wood doweling now and then till I could move them. If they wouldn't move gave them another shot of Kroil.

[Yammer Dan]

Kroil??

[Flyinfool]

Kroil??

 

Kroil is great stuff for unsticking things. I keep several can on hand.

http://www.kanolabs.com/google/

[Flyinfool]

Kroil??

 

Kroil is great stuff for unsticking things. I keep several can on hand.

http://www.kanolabs.com/google/

Always Google it to get the Google discount.

[Peder_y2k]

Success!!!!

After soaking in PB Blaster overnight, decided to remove the main jet needles in order to fit a levering tool past the needle jet centerline, and with a little coaxing, the slides MOVED. They moved enough to replace the metal lever with a flat carpenter pencil to finish levering them out to where I could grip and pull. Came out without any damage, and Berrymans flushed the damp varnish right off the parts.

Now I can continue to clean up the carbs and put it all back together and start it up with fresh fuel.

-Pete, in Tacoma WA USA

[Yammer Dan]

:clap2: Good Luck!!

[dacheedah]

a little air to blow through the orifices will help