Moar Ducati carbs - Ex-500.com - The home of the Kawasaki EX500 / Ninja 500R
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post #1 of 12 (permalink) Old 4-17-2019, 9:45 PM Thread Starter
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Moar Ducati carbs

Plugged pilot jets, way low float heights (yielding way high fuel levels), dead float valve return springs, flattened, hardened orings and fouled fuel rail seals, 1 pilot screw missing oring and washer.....these require definite, long overdue attention. Disassembled, split, ready for action to begin tomorrow.

I hope the Dawn dish soap does the trick
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Last edited by ducatiman; 4-17-2019 at 9:52 PM.
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post #2 of 12 (permalink) Old 4-17-2019, 9:51 PM
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Were these designed to be split? Also, do you split the EX carbs?

There is something oddly satisfying about watching you work. The dirtier they are at the start, the better it is. Lol
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Money can't buy happiness. But it can buy a motorcycle. And you can't be sad on a motorcycle.<br /><br />"That's kinda like bragging you got 30K miles out of your original oil filter before the rod bearings failed."
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post #3 of 12 (permalink) Old 4-17-2019, 10:11 PM Thread Starter
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Surely, these BSDT38 Mikuni's were engineered for and used by various other period 4 cylinder multi's...Yamaha, Suzuki's. I'd guess they raided the parts bins, designed with both 2 and 4 cylinder applications in mind. Keihins do similar to meet various 2/4 cylinder applications.

Way beyond a simple "carb kit" ....splitting affords access to further cleaning, especially replacing the vent and fuel rail seals and clearing the fuel pathways between carbs (all very important, IMHO)

I always replace both fuel and vent rail orings on EX250 and 500 applications. They are traditionally not included in carb kits, but consumables nonetheless vital to restore long term reliability.

These bikes are ageing....renewing seals (only accessed via splitting) is essential in "turning back the clock". You'll see...these babies 'll look and perform like new....as I always post "will offer a long service life"......"REFURB" or restoration (whichever term you prefer) can only be attained and proclaimed by replacing everything. I'll post up pics as I complete these.

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**Being shot out of a cannon will always be better than being squeezed out of a tube. That is why God made fast motorcycles, Bubba.... Hunter S. Thompson**


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Last edited by ducatiman; 4-18-2019 at 9:49 PM.
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post #4 of 12 (permalink) Old 4-18-2019, 7:39 PM
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Are those the ones from "finally home" ? Per our previous conversation I'm guessing so.



I don't know if you knew but his SP is top triple plate number 001 for that year in the US. Pretty cool.....and if I could have done so, I'd have bought it a long way back when I was looking for a 900SS. Looking forward to seeing how these come out........sean


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post #5 of 12 (permalink) Old 4-18-2019, 8:52 PM Thread Starter
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Yes they are, though I didn't realize his was 001. These carbs were long neglected. Among his issues ...both pilot jets plugged, many gaskets not only hardened, but nearly crystallized, his *float* levels set extremely low at 11mm...should be near 15. As a result an extremely high *fuel* level...I believe he was sucking in basically unmetered fuel during his failed start attempts.

I counted around 70 disassembled component pieces in total....every one scrutinized and dealt with to some degree.

All circuits and jets are now clear, new rail seals (Suzuki, LOL), ALL new orings everywhere, new float valves, spoke to owner today to fulfill his specific jetting tweaks and setup needs. I'll be cojoining the bodies tonight, wet testing tomorrow.

MOAR BETTER, EH? Looking good, I predict they will run fine as well.

Almost forgot...NO ovaling of the emulsion tubes with stock 5C22 needles. I've got a new theory on the cause of that Ducati specific issue...but another time.
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**Being shot out of a cannon will always be better than being squeezed out of a tube. That is why God made fast motorcycles, Bubba.... Hunter S. Thompson**


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Last edited by ducatiman; 4-19-2019 at 12:07 AM.
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post #6 of 12 (permalink) Old 4-18-2019, 11:17 PM
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Originally Posted by ducatiman View Post
MOAR BETTER, EH? Looking good, I predict they will run fine as well.

Almost forgot...NO ovaling of the emulsion tubes with stock 5C22 needles. I've got a new theory on the cause of that Ducati specific issue...but another time.
Whoa....yes, MOAR BETTA!! That is intriguing that there is no ovaling. I'm now wondering if that is a by product of using the Ti needles? Ti is far harder than brass so it would make sense. What material are the stock needles? Stainless or brass as well? Anyway, I'd love to see you expound on your theory.....sean


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post #7 of 12 (permalink) Old 4-18-2019, 11:23 PM Thread Starter
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even MOAR BESTEST ER...finished them tonight Done pending wet testing

even installed ye old Kawi rail filter, fits moar better er...perfect even
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**Being shot out of a cannon will always be better than being squeezed out of a tube. That is why God made fast motorcycles, Bubba.... Hunter S. Thompson**


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Last edited by ducatiman; 4-19-2019 at 12:08 AM.
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post #8 of 12 (permalink) Old 4-18-2019, 11:35 PM
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LoL.....that last line about Moar Better er made me laugh. Sounds like some of my buddies at the old shop talkin' shit to one another.


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post #9 of 12 (permalink) Old 4-18-2019, 11:36 PM Thread Starter
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pm sent re theory

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**Being shot out of a cannon will always be better than being squeezed out of a tube. That is why God made fast motorcycles, Bubba.... Hunter S. Thompson**


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post #10 of 12 (permalink) Old 4-19-2019, 11:19 AM Thread Starter
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LoL.....that last line about Moar Better er made me laugh. Sounds like some of my buddies at the old shop talkin' shit to one another.
30 years at a union shop...I'd fit right in, 4 sure erer

and them Ducati carbs now on their way home to Michigan.

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**Being shot out of a cannon will always be better than being squeezed out of a tube. That is why God made fast motorcycles, Bubba.... Hunter S. Thompson**


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Last edited by ducatiman; 4-19-2019 at 3:11 PM.
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post #11 of 12 (permalink) Old 4-24-2019, 3:53 PM Thread Starter
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and THIS time, I didn't forget to reorder enough stuff for even moar Duc carb refurbs.

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**Being shot out of a cannon will always be better than being squeezed out of a tube. That is why God made fast motorcycles, Bubba.... Hunter S. Thompson**


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post #12 of 12 (permalink) Old 5-4-2019, 2:30 PM Thread Starter
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Originally Posted by Apriliarider View Post
Are those the ones from "finally home" ? Per our previous conversation I'm guessing so.
I don't know if you knew but his SP is top triple plate number 001 for that year in the US. Pretty cool.....and if I could have done so, I'd have bought it a long way back when I was looking for a 900SS. Looking forward to seeing how these come out........sean
And "finally home" reports his SS started right up, no issues, sent video of the new owners quickie test ride. He's quite happy, bike has swapped hands now, transaction finalized. Somehow I gain some inner satisfaction, as if its partially mine.... hearing the bike come alive, happy, laughing ex and new owner (he's selling the bike to his friend/neighbor) I tried to download .mov file, but the system won't allow it.

GTG...a moar-er set of 2 fitty carbs just arrived.

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**Being shot out of a cannon will always be better than being squeezed out of a tube. That is why God made fast motorcycles, Bubba.... Hunter S. Thompson**


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Last edited by ducatiman; 5-4-2019 at 11:19 PM.
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