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Thread: Cleaning Used Throttle Body

  1. #1
    Registered User m_stock10506's Avatar
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    Cleaning Used Throttle Body

    I purchased a pair of used throttle bodies.
    My plan is to clean them up, send the injectors out for professional cleaning and eventually swap them onto my R1100RT (currently 100k miles). So, I don't have a parts washer or ultrasonic cleaner. I've got an aluminum roasting pan, simple green and any other bottle of cleaner chemical available at the local auto parts places. What's my best choice to get these cleaned up. They are fairly grungy both inside and outside.


    Used Throttle Bodies.jpg
    Michael Stock, Trinity, NC
    R1100RT, R100, R60/6

  2. #2
    IBA #44567 Ken F's Avatar
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    soak them in vinegar with lemon juice
    IBA #44567
    "Two things are infinite: the universe and human stupidity; and I'm not sure about the the universe."
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    Quote Originally Posted by m_stock10506 View Post
    I purchased a pair of used throttle bodies.
    My plan is to clean them up, send the injectors out for professional cleaning and eventually swap them onto my R1100RT (currently 100k miles). So, I don't have a parts washer or ultrasonic cleaner. I've got an aluminum roasting pan, simple green and any other bottle of cleaner chemical available at the local auto parts places. What's my best choice to get these cleaned up. They are fairly grungy both inside and outside.


    Used Throttle Bodies.jpg
    Just make sure you remove the TPS before using any strong solvents on the TB's.

  4. #4
    Curmudgeon nrpetersen's Avatar
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    Quote Originally Posted by Ken F View Post
    soak them in vinegar with lemon juice
    That's a new one on me. Does it by chance cut corrosion etc too? Where do you use it? What sort of mixture? How long to soak?

    I was going to suggest carb cleaner & cotton swabs, here. I know carb cleaner will dissolve a toothbrush handle. DAMHIK.....
    Retired w 2005 K1200LT, 2000 R1100RT, & 1975 R90/6

  5. #5
    IBA #44567 Ken F's Avatar
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    Several different methods. My favorite is 1 part vinegar/2 parts water and soak for 24-48 hours.
    You can also heat it on the stove and cook the parts for 1-2 hours.
    I'd try on a small piece first to test for discoloration.

    It's jsut a mild acid.....

    Ken
    IBA #44567
    "Two things are infinite: the universe and human stupidity; and I'm not sure about the the universe."
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    I've heard of folks using a pine sol solution. Go over to adv riders forum and read up on it.

    Personally, I have not tried it... yet

  7. #7
    Aspiring Profligate jeff488's Avatar
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    I recently learned about a 50/50 mix of Dawn dish wash liquid and white vinegar as a degreaser. The vinegar needs heating to coffee temperature prior to mixing so it combines better with the soap. Biodegradable is a plus.
    Works very well. Spray on, scrub with stiff brush and rinse with water.
    Cheap, too.
    '04 Silver R1150RT "Big Oel". '05 Yellow KLR 650
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  8. #8
    Registered User m_stock10506's Avatar
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    Quote Originally Posted by R1100RS View Post
    I've heard of folks using a pine sol solution. Go over to adv riders forum and read up on it.
    Personally, I have not tried it... yet
    Yep, going to try the Pine-Sol soak. It will take a few days before I can report back but I will provide results.
    Michael Stock, Trinity, NC
    R1100RT, R100, R60/6

  9. #9
    Registered User weeman's Avatar
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    Fresh and clean too!

    Quote Originally Posted by m_stock10506 View Post
    Yep, going to try the Pine-Sol soak. It will take a few days before I can report back but I will provide results.
    It'll be clean and fresh smelling when you're done!

  10. #10
    Registered User m_stock10506's Avatar
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    Clean Throttle Bodies

    Done.
    I soaked the throttle bodies in a mixture of Pine-Sol and water in a 1:1 ratio. The water was hot when I started this. Soaked the right side TB for about six hours. I used a soft toothbrush on a few tough spots but that might not be necessary. Then I removed it and rinsed, first with warm sudsy water, then just hot water. With the hot water I was able to remove the rubber manifold between the TB and the cylinder which was stuck on before.

    Then I placed the left side TB into the Pine-Sol solution after adding a bit more of hot 1:1 mix. The TPS was removed before the left TB went into the bucket. Soaked it for six hours too. The mix was pretty dirty after the first TB and this may have reduced the effectiveness as the left TB did not clean up quite as well as the right TB. The insides cleaned real well on both, just the outside of the left TB was not as clean.

    Photo of the Right Throttle Body, before and after.
    Throttle Body Right 1.jpg
    Michael Stock, Trinity, NC
    R1100RT, R100, R60/6

  11. #11
    Registered User m_stock10506's Avatar
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    Right throttle plate on the air intake side, before and after.
    Throttle Body Right 3.jpg

  12. #12
    Registered User m_stock10506's Avatar
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    Right throttle plate on the engine side, before and after.
    Throttle Body Right 2.jpg

  13. #13
    Registered User m_stock10506's Avatar
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    Right throttle body, after cleaning.
    Throttle Body Right 4.jpg

  14. #14
    Registered User m_stock10506's Avatar
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    Left throttle body, before and after.
    Throttle Body Left 1.jpg
    Michael Stock, Trinity, NC
    R1100RT, R100, R60/6

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    Carb Cleaner

    Just went thru this exercise on mine this morning using a commercial carb cleaner. Used a tooth brush and fine steel wool and the results weren't near as impressive as these. Since they are still off the bike, I'm going to soak them and see how they do. I'm curious, the right throttle body has substantially more black buildup than the left. Mine looked just like that also. I was concerned that there might be a problem in the balance. Any thoughts?

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