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Ironhead Sportster Motorcycle Talk (1957-1985) For all those that wanna talk about Ironhead Sportster Motorcycles

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  #11  
Old 10th August 2022
Racepres Racepres is offline
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While in Rebuild process... Make sure your float, actually Floats... some are "lighter" than others.. If the float, floats reliably... that damnable little spring is Not a necessity (yea somebody somewhere will eventually call ya out for leaving out parts...Oh Well)
In general, those floats are not reliable, and therefore one needs to struggle with that Spring... Worth it to study carefully and get it in Correctly. If installed incorrectly, it is Worser than leaving it out!!!
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  #12  
Old 10th August 2022
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IronHeadRon IronHeadRon is offline
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Quote:
Originally Posted by Monte03 View Post
Bendix - Zenith Float Needle & Seat * there are many Threads on this Carburetor here at XL Forum, If you ever pull the VITON coated float needle , inspect it with a Magnifier, the seat is just a Brass Ring, as the Needle wears it gets an indent ring around the VITON and will ‘hook’ in the brass ring seat , at this point replace the float needle
Yeah, you should check that gas is getting to the bowl, I guess I just assumed you had a clear filter you could watch flow like I do. But definitely would cause a lack of squirt!
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  #13  
Old 10th August 2022
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Monte03 Monte03 is offline
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Float level is 3/16” end of float to carb body flat , use a 3/16” drill bit
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  #14  
Old 10th August 2022
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IronHeadRon IronHeadRon is offline
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Quote:
Originally Posted by Monte03 View Post
Float level is 3/16” end of float to carb body flat , use a 3/16” drill bit
Yup, that's the spec. However you may need to adjust up or down to fit your particular set up (in my experience anyways very small adjustments) to get it to stop the flow (on my carb, maybe others have issues with flow stopping to soon, or maybe it has to do with the dump and spec works for most -\_o_/-)

Anyways, he didn't mention a float issue, and the plunger gas is sucked up from the bottom so idk why it would be (unless the needle is stuck shut as someone mentioned above, but that seems far from the most likely cause, and if it's overflowing that doesn't affect the squirt in a bendix in any substantial way, just makes it a bxxxx to get started).

imo
It's either the plunger he was searching or the brass valve at the bottom if the bowl I think. Best way to tell is (again, imo) to tear it apart, suck through the plunger hole ensuring it comes from bowl, blow ensuring it goes to venturi (it takes quite a blow, but I felt it, hence why I am not using the new valve) this will rule out the valve, then its either the plunger or linkage

If his throttle is opening and the plunger is attached correctly it is most likely not the linkage leaving the plunger he is searching for the most likely culprit

Be careful not to huff too much gas, best to let the bowl dry out a while, and probably blow first actually

also, if I remember right you'll see the valve jump up and maybe turn ¼ or a something ...... yeah, I'm pretty sure I am recalling correctly, but most importantly air comes from bowl and goes to venturi with respect to the hole the plunger is inserted to; for ruling out the valve anyways.

EDIT replace all instances of venturi with brass nozzle thingy that sticks into the venturi, clearly when the bowl is off the venturi is sitting on the bench or something
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  #15  
Old 10th August 2022
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* I mentioned the float 3/16 measurement as general info to help the poster, Set too low it starves - Too high gas pisses out the overflow onto the Magneto or Distributor , and that won’t be pretty ..
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  #16  
Old 11th August 2022
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ZTatZAU ZTatZAU is offline
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Quote:
Originally Posted by ricusa View Post
Are there any good quality accelerator pumps still available out there for these carbs? The ones I've found so far are cheap & useable. Even Zenith refers you to Chinese made kits. I just had to order a NOS Harley #27762-71TA from Australia! Still have a couple bikes with these carb's.
I'm wondering what ever happened to RICUSA and how this thread has gotten so far afield??? This discussion has really wandered from the OP's question?

Ricusa simply asked if anyone knew where to get a good quality accelerator pump. The Zenith kit (from Zenith or D/K) contains an accelerator pump that works fine. (Purple color plunger as opposed to black or gray)

Ricusa said, "... The ones I've found so far are cheap & useable..." Though I'm guessing that he meant un-usable; but he never explained what the problem was.

From what I've read the cheap black accelerator pump plunger cups are difficult to insert into the barrrel without distortion and lose their seal. But the purple zenith plunger cups worked just fine for me and seem to work fine for many others.

The only other problem I've learned about is some of the accelerator plunger shafts are too long above the single hole (or multiple adjustable holed) pin that secures the shaft to the pump actuator. The extra length can cause the end of the shaft to hang up on the actuator. The Doctor 71 wrote about this problem here...

http://xlforum.net/forums/showthread...mp#post5724843 (see POST #12)

And posted his fix for this problem here...
http://xlforum.net/forums/showpost.p...20&postcount=7

I'm still learning here but I hope this helps the OP!

ZT (Ironhead Apprentice)
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