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  1. #1
    PWCToday Regular
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    Low speed circuit plugged

    One of my mikuni 44mm low speed circuit is plugged. Pulled the low speed jet and low speed adj screw. Blew carb cleaner and also compressed air and still cannot get it to open up. Spray carb cleaner in the adj screw hole and it does not flow thru. Any suggestions?

  2. #2
    PWCToday.com Is My Home Away From Home Myself's Avatar
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    Re: Low speed circuit plugged

    What does the end of the adjuster look like? Maybe its broken off.
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  3. #3
    PWCToday Guru Dan87951's Avatar
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    Re: Low speed circuit plugged

    Quote Originally Posted by Myself View Post
    What does the end of the adjuster look like? Maybe its broken off.
    That's what I was thinking. If that isn't it, you might need to soak it in Chem-Dip. This stuff does an excellent job of cleaning carburetors.
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  4. #4
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    Re: Low speed circuit plugged

    No the adjuster is all there. There is hardened white stuff in the low speed bypass hole. Trying to dig it out with with a dental pick but that won't help with the internal circuit. I bought these Buckshot 44mm's off from ebay. I'm thinking the carb ingested salt water and this is what's left. The other carb is perfect.
    Will an ultrasonic cleaning unit clean the internal circuit?
    Last edited by critracer; 09-03-2017 at 11:02 AM.

  5. #5
    I dream skis Bionic racing's Avatar
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    Re: Low speed circuit plugged

    That's e bay for ya , buyer beware , try ultrasonic cleaner after you soak in water and muratic acid mixture (pool acid ) , I bring back all kinds of carbs with this soak , whited out float bowls on motorcycle carbs , etc ., they come out perfect and won't attack paint unless salted out , put carb in stripped condition , carb body only , in plastic bowl , fill with water , add to water 3 cc s of pool acid , let sit for an hour , go back and you should see the debris bubbling out of the carb in area where blockage is , if not bubbling add more acid , if you have too much acid it will make the water HOT to the touch and will start to attack aluminum , dump and start again with less acid or more water , ideal is cold water with bubbles coming out of contaminated area , monitor for a day , pull out and blow out circuit with compressed air , if not clear repeat process , be patient , let the acid work, have not tried to do the electrolysis removal on aluminum yet , battery charger and water with steel rod , might work too , the pool acid attacks corrosion and tidrifal varnish contamination well

  6. #6
    PWCToday.com Is My Home Away From Home Myself's Avatar
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    Re: Low speed circuit plugged

    You can also try pulling a strand or wire from a brass wire wheel. Maybe try feeding it from the low speed hole in the carb throat backwards into the passage.
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    light porting, massaged cases, lightened flywheel, port matched manifolds, Rossier pipe, stubby pump cone

  7. #7
    PWCToday Regular
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    Re: Low speed circuit plugged

    Thanks Bionic,I will try the muratic acid & water. Stay tuned for results.

  8. #8
    PWCToday Regular
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    Re: Low speed circuit plugged

    Low speed circuit is all cleaned out. I used NAPA house brand carb-dip, on sale for $20.00. Let it soak for 45 minutes and then went to work with safety wire and compressed air. Took a bit of time but all cleaned out. Just waiting for a new throttle shaft assembly and then the 787HX will awaken!

  9. #9
    resident guru hafweigthr's Avatar
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    Re: Low speed circuit plugged

    Small stainless steel tubular wire brushes(like used for paint sprayers,etc) also work well for this.
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