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  #1 (permalink)  
Old 01-29-2020, 11:05 AM
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Join Date: Apr 2012
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Bike Year, Make, Engine: 99 Softail, 127 Ultima
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Mikuni rebuild - brass washer

Long story short my bike was in my garage which burned down last year. Not much damage to the bike besides smoke and water and I’ve been slowly going through and checking things off the list of things to do. I purchased a rebuild kit for the mikuni 48 carb and all was well until I realized I have no idea where a small brass washer came from and where it goes during reassembly. After reviewing the exploded parts diagram from mikuni, the only option I see is the pilot air screw washer #52 on the parts diagram. The I.D. Fits the screw but the O.D. Does not fit into the threaded hole. I’ve pulled the carb apart and re assembled multiple times trying to figure this out with no luck. Any ideas???

I did pull the carb body apart in an effort to give it a thorough cleaning which may not have been the best idea in retrospect. If I recall correctly, I noticed the washer in my cleaning solution once I split the body. Whether that’s where it came from or not I am unsure. Thanks for any help
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  #2 (permalink)  
Old 01-29-2020, 06:31 PM
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The spring goes on the pilot screw, then the washer, then the o-ring. Then you screw the assembly into the carb body, the spring keeps the screw set, the washer acts as a seat for the spring and protects the o-ring.
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  #3 (permalink)  
Old 01-29-2020, 09:43 PM
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If I put the spring then washer then o ring, the assembly doesnít fit into the body. The washer is bigger than the threaded hole. I donít think this washer actually belongs on the pilot air screw. Itís too big

Last edited by TLOJKO; 01-30-2020 at 05:13 AM..
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  #4 (permalink)  
Old 01-30-2020, 05:27 AM
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Just spit balling here but what are the chances someone modified the carb in some way and used this washer in a way not listed on the parts diagram? Of all the places I’ve tried it, the best fit I’ve found is in the body where the choke plunger goes. It seems to fit perfectly, but not on the diagram. It also fits perfectly in the body where the needle jet and extender thread into. Any chance it was added between the jet and the extender? Is that something a tuner might do if positioning the needle requires it?
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  #5 (permalink)  
Old 01-30-2020, 01:04 PM
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Sorry for so many posts back to back but some google searching led me to lots of people discussing shimming the needle on the mikuni carbs to help with lean conditions. This washer definitely was not shimming the needle itself, but has anyone seen a shim between the main jet extender and the needle jet? I guess it would lower the jet a bit further into the bowl just a bit more than running the extender alone
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