ULTRASONIC CLEANING

[oldntired55]

Do you use a stabilizer, it is a must plus 89 octane a must for 2 cycle, I use stable marine brand all year, 1 oz per gal. eliminated 95% of fuel problems. Stabilizers do not absorb much water, the fumes push fresh air.

yes Stabil

 

[Wellcraft1]

On my gun parts I put Simple Green or other cleaners in a zip lock bag with the parts to be cleaned, then I have warm water in my parts cleaner, put the zip lock bag in the cleaner and turn it on to let it do its thing. This saves a lot of cleaning solution.

 

[oldntired55]

You say:

Wondering if the wisp of black smoke starts the surging or ??
Wisp of black smoke, intake valve guide??
Make sure you have a good new properly spark plug.
Try holding the carb throttle steady at different rpm's so as to defeat/disable the governor. I see in one of your posts where you indicate it also surges/hunts at low speed or idle. Try adding little bit of choke gradually and see if it tries to get smoother. If it does it's running lean, too much air, not enough fuel. (due to air leak or restricted fuel delivery)

Take note if it idles really good at slow rpms and then if it idles slow really good start opening the throttle manually and when the rpm's get fast just hold it and see if it ever puffs any black smoke.

I've seen those Tecumseh adjustable jet carbs that the H jet on the bottom of the bowl would be very critical of proper adjustment from cold to warm engine, 1/8 turn in too far would get cold surges. The H jet is usually very responsive to fast rpm adjustment also. (usually a range of about 1 1/4 to 1 3/4 turns out but 1/4 turn in/out can be critical) Also make sure the little flat washer (that usually get lost) is on the bottom of the H jet spring or the spring will chew the little sealing o ring and the H jet WILL HAVE the annoying slow fuel drip.
Take care of that Adj jet Tecumseh carb, they are few and far between.
The replacements carbs are usually the non-adjustable lean surging and hunting type. (fixed jet)

Is that the points condenser type engine or the electronic magneto type.
Engine ID info posted would help.

Did you try the 8 hp carb?

I'm beginning to suspect it's not the carb.

i am going to try the 8hp carb tomorrow, working today. i will say, when it goes from idle to mid or hugh speed with throttle lever, it will stumble, puff black smoke, surge a few times then smoothe out. the washer is under the spring on main jet, lost one once so pretty careful about those. im not scrapping the carb yet, i believe the one on the 8hp is also adjustable, will keep you all posted. magnatron magneto, new spark plug.

 

[Tiger Small Engine]

just looking for a few opinions, i have an ultra sonic cleaner i bought from Harbor freight... ( dont laugh please) it works pretty well i think, sometimes after 2 cleanings for stubborn dirt. i bought the solvent from harbor freight... what kind of cleaners do ya all use ?? im thinking of trying Dawn dish detergent.

I use 1 part Super Clean to 3 parts water in

i am going to try the 8hp carb tomorrow, working today. i will say, when it goes from idle to mid or hugh speed with throttle lever, it will stumble, puff black smoke, surge a few times then smoothe out. the washer is under the spring on main jet, lost one once so pretty careful about those. im not scrapping the carb yet, i believe the one on the 8hp is also adjustable, will keep you all posted. magnatron magneto, new spark plug.

I use Super Clean in ultrasonic cleaner.

 

[oldntired55]

I use 1 part Super Clean to 3 parts water in

I use Super Clean in ultrasonic cleaner.

ill give that a shot!

 

[oldntired55]

i am going to try the 8hp carb tomorrow, working today. i will say, when it goes from idle to mid or hugh speed with throttle lever, it will stumble, puff black smoke, surge a few times then smoothe out. the washer is under the spring on main jet, lost one once so pretty careful about those. im not scrapping the carb yet, i believe the one on the 8hp is also adjustable, will keep you all posted. magnatron magneto, new spark plug.

one more important thing i forgot to mention, the 3 little transfer holes in throttle bore were cleaned with a small L-shaped wire. no restriction, although... i did not remove welch plug. wondering if dome dirt or corrosion trapped behind it?

 

[rdedrick]

just looking for a few opinions, i have an ultra sonic cleaner i bought from Harbor freight... ( dont laugh please) it works pretty well i think, sometimes after 2 cleanings for stubborn dirt. i bought the solvent from harbor freight... what kind of cleaners do ya all use ?? im thinking of trying Dawn dish detergent.

Totally Awesome from the Dollar General works as good as anything I have tried. I have heard the Cascade platinum dishwasher works really good but I haven't tried it. Over the years I have used simple green and others I don't remember. For carbs make sure you get the outside clean first with brake clean or that dirt may be deposited some where you don't want it.

 

[StarTech]

Ultrasonic cleaners does a very good job at cleaning but they are not miracle cleaners. Sometimes it require some additional mechanical cleaning. With ultrasonics the surfaces must be a little rough microscopy; otherwords, say a jet with a very smooth clog it will not clean. This is because there is no place for the microscopy bubbles to form that in turn explode loosening the unwanted foreign materials.

Another mistake some do is to overload the solution with cleaning agents. Just use enough to suspense the foreign materials and no more. Actually your cleaner will let you know by sounding more muffled than normal as it get overloaded with cleaners. Or at least my does.

And all ultrasonic will not fully clean on the first cycle. Most will require multiple cycles depending how dirty an item is. And everyone should do at least one rinse cycle when cleaning done to remove the cleaners.

As for welch plugs most can be left in place as the foreign materials are usually broken up very fine pieces and float out the small opening. Hence with a clear cleaning solution it looks as if the item is smoking out the ports.

The problem I had so far besides burning out a heat element due leaving an unit dry is the size of the HF one is too small for my applications. And I might consider an even larger unit later if needed than my current 6 or 10 liter unit.

 

[Forest#2]

one more important thing i forgot to mention, the 3 little transfer holes in throttle bore were cleaned with a small L-shaped wire. no restriction, although... i did not remove welch plug. wondering if dome dirt or corrosion trapped behind it?

I would not remove the welch plug unless the other carb tests good.

I don't remove welch plugs on old carbs that I do not have a correct replacement plug UNLESS I know for sure it's the carb and I've tried most everything else first so as to get it corrected.
If I do not have a replacement plug I carefully drill a small hole in the center of the plug then use a O ring pick or ice pick to carefully remove the plug for re-use. I reform the plug concave using a piece of leather and re-install and use a non-runny slow drying epoxy to reseal the hole without getting any epoxy inside and cover the complete plug out to the edges.
I have a screened carb cage and I can sometimes use blow gun with needle tips and force out a welch plug with high pressure air into the welch plugs jet area and not have to drill.

 

[StarTech]

Actually HF sells a doming tool for making domes and reshaping them.

Doming Block Kit