Overflowing carbs issue SOLVED! Check the float DROP! BS34 Mikuni.

[@rgmax6205]

I’ve never seen anyone address this. Very informative. Thanks!

[@MotoRestoFL]

Thanks. It's rarely necessary to address. Doesn't happen very often. It's one of these things where if you have a carb or carbs that just keep spewing gas after rebuild and rebuild again and again and again with all settings exactly to spec, you gotta look elsewhere than the normal stuff. Many carbs don't have float bowls deep enough to let the needle get cattywampus and jam up in the float seat. What I have found is, if you have a set of older Mikuni's that use the flat paper/composite gaskets on the float bowls and not the O-ring type like newer Mikuni's and almost all Kehin's, this is something to take a look at. Seems those carbs have the deeper float bowls. The early Keihin's and the low buck Honda's like the old XL's with the solid slide carb, where the throttle cable goes right into the slide, these type are definitely suspect. Cheers.

[@mathewcridland1084]

@@MotoRestoFL G'day champ, great last vid, very much, informative. Mate any chance you happen to ask the Z1R custom if he'd sell me that Z1R swing arm you so meticulously engineered so well ? Big fan. Cheers mate, G'day from OZ

[@MotoRestoFL]

@@mathewcridland1084 he's been away for work for quite some time. Should see him after first part of December. Email me your offer to [e-mail] and I'll present to him. Please note, he hasn't made a 100% decision on which swing arm he's ultimately going with. Again, make sure you send an email. I will forget if I don't see it sitting there in my in-box. Cheers.

[@calvarycustoms6681]

Wow, excellent troubleshooting here. I’m working on a customer’s VStar 650, and immediately after rebuilding the carbs (duals), I’m having massive fuel flow out of the carb breather tube. My first thought was, of course, bad float settings on the Jhinese rebuild kit that the customer supplied (w/ plastic floats, and the tiny clips that “secure” the needle to the float tang). But I’m really glad I came across this video, so now after I open the bowls back up, I can double-check those drop-stops and also check for a needle bind condition. Otherwise, might have adjusted the floats, buttoned-up the bowls and STILL had an overflow, and then have to open em up AGAIN. Thanks for this helpful vid!

[@ipfreelynow]

Very interesting, I never noticed those tangs. I'll have to check mine next time I pull my carbs.

[@cavsnake13]

Great stuff, working on my 1979 xs1100 and having an overflow problem. Your channel a great resource! Thank you!

[@MotoRestoFL]

Thanks. Consider subscribing for more! Like and share videos helps also.

[@cavsnake13]

@@MotoRestoFL oh we have BEEN subscribed! Bell on baby

[@nikolamasic7395]

I found this the hard way working as an apprentice on Virago Hitachi carbs that would always flood. After two years and many carbs I came across a float drop conversation and it solved all my problems. All the old men in my area were thrilled there were no drips under their Viragos, or Viagros, as the English would call them.

[@lickitysplit2413]

Good mechanics have to have some detective in them. Good catch

[@brianishmael7845]

Glad I came across this video

[@SkyrayModels]

Great result finding the float tang issue, Happy Thanksgiving.👍

[@stevensapyak7971]

12.28.23. I just watched a video from a KZbin channel called Lost Socket MotoSport©️, and someone was commenting in the comment section of his video that they were having trouble with a carburetor, not sealing up with the float valve and seat, so I linked your channel/Float Drop video in his comments section, so someone can view your Float Drop video, for them to consider when they can’t find a reason for the carbs overflowing⚠️

[@MotoRestoFL]

Thanks. Hope it helps too.

[@306GokartsCustomBuilds]

Having a similar issue qith rebuild carb ..cant wait to vuvw your method a try thanks

[@gimpygardner3377]

Rochester B carburetors have a spec for float drop, typically 1-3/4".

[@MotoRestoFL]

No kidding... Yea, haven't fussed with a Rochester, Carter or Holley in a LOT of years, but I am not surprised cheers.

[@cussheavy8672]

Life saver!

[@henryhawk978]

What is the silver knob between 2 and 3 ? And should there be hoses going from the over flow ports to the underside of the bike? The floats I read on 94-97 are unadjustible. Enjoyed the video and RIDE SAFE OUT THERE!

[@MotoRestoFL]

Idle adjustment. Yea there’s supposed to be hoses sometimes I do and sometimes I don’t. It’s not critical.

[@henryhawk978]

​@MotoRestoFL the 94-97 I was referring to about the unadjustible floats was the VFR750F.

[@MotoRestoFL]

@@henryhawk978 yes many are. Valkyrie also. If it’s way out replace float.

[@henryhawk978]

What should the measurement be on the floats for the VFR750F floats? I'm gonna be pulling the carbs, I have a leak. So I'm gonna check everything. Also, the choke isn't working so I've got to check it out.

[@MotoRestoFL]

@@henryhawk978 I don’t recall at the moment, you can find a manual online or I’ll have to look it up later.

[@Solabo95]

Thank you so much!!!

[@mikecogswell2364]

Excellent video! I'm tinkering with a 79 Kawasaki KZ650 and am unable to get the floats set correctly. Too much flow or too little/none. I live fairly close to you. Are you available to check them out?

[@MotoRestoFL]

Check back in a week or so, I’m having some medical issues right now.

[@MotoRestoFL]

Oh and thanks.

[@MotoRestoFL]

@mikecogswell2364 I am feeling somewhat better now and had to cancel my motorcycle trip to TN so I am staying in town, if you want to reach out on these carbs, email me [e-mail] and include your phone # and we'll talk. Thanks.

[@JohnBenda-o2p]

Glad I watched this. I just restored/cleaned a set of 3 from a 1978 Yamaha XS750 E. The bike hadn't run for many years, so the float bowls were stuck to the floats upon disassembly. The float drop tangs were likely bent when I forcibly separated the float bowls from the carburetor bodies. The engine ran well during the initial startup, but after the test ride, the engine wouldn't idle down. The carbs then showed signs of leakage and possible overflow. After watching this video, I now know where to investigate.

[@denniz1990]

Lets see if this is the problem on my srad ... Hopefully it is

[@adamlafont2715]

Y is the other jet capped off?

[@MotoRestoFL]

You'd have to ask a Mikuni engineer I don't know. Several Mikuni's are like that, the slow circuit is plugged at where it typically would be open, and there is a connecting port between the main and the slow where it ultimately gets its fuel from. Again, I don't know why. Just the way they did it.