Repair Fuel Leaking From Air Filter on Carbureted Dyna Project Bike

After #MillennialBlue (See Instagram), the 2005 Dyna FXDC Brock’s Performance project/team building bike, started leaking fuel out of its Sprint Filter - Brock decided to document the repair after KZbin and Internet searches came up soft. Brock has been repairing and tuning carbs since he was 12 years old, so he drops some of that knowledge on today’s mostly EFI crowd, just in case they need help with their own carb issues.
FYI: this repair technique works for almost all carburetors, brands (Keihin, Mikuni, etc…) and types (flat slide, CV, etc…)
Brock also explains the transition of Millennial Blue from “not quite basket case” to a fantastic handling American machine utilizing Brock’s Performance aftermarket and various sportbike parts (Dynazuki?!) as he dives into the repair of the Keihin 45mm CV carb using practical experience as a guide vs. the technique offered in most service manuals.
Viking Powder Coating: bit.ly/3GG0Onr
#MillennialBlue Build Page: bit.ly/3GGZUa5
We hope you enjoy: Repair Fuel Leaking From Air Filter on Carbureted Dyna Project Bike
Video Time Stamps:
0:00 - Millennial Blue introduction
2:54 - A powder-coated paint job?
5:48 - Upside-down fork conversion
9:04 - Swingarm, wheel, and tire choice
12:03 - How does this modified Dyna ride?
14:05 - Fuel leaking through the air filter?
16:25 - Proper operation of a vacuum petcock
19:02 - Where is the fuel leak coming from?
21:42 - Removing and inspecting float bowl
25:40 - Explaining and testing carburetor float
29:02 - Removing the carburetor float pin
31:30 - Inspecting the float, needle, and seat
34:27 - Adjusting the float to properly seal
37:15 - Checking and reinstalling the float
40:03 - Reinstalling the carburetor float bowl
43:03 - Starting bike and checking for leaks
45:16 - Issue recap and exhaust demonstration
47:34 - Would you believe this is a budget build?
49:39 - Additional mod flexibility and conclusion
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[@BrockDavidson]

Click SHOW MORE for additional information video chapters-timestamps. We EDIT our subtitles! - Select English for the best international translation. ** Please LIKE and SUBSCRIBE if you enjoy our channel!

[@timcaldwell2619]

Man, I appreciate you making the video and everything but I gotta tell you you talk too much instead of getting to the point of the fix we didn’t need to hear all that other stuff that’s all I Gotta say

[@BrockDavidson]

@@timcaldwell2619 gotta tell you I'm working on a coloring book, that's all I'm sayin

[@shadowred1980]

I don't have a Harley, possibly never will. Watched the full video anyway. Any guide from Brock is worth the time.

[@TL1000S97]

Same here 👌

[@Dragbikeracing]

100% truth!

[@64faffi]

Observing the limited number of views, likes and comments, your video is another demonstration that the majority does not want to learn anything, they just want to be entertained. However, for those of us actually wanting to expand our knowledge, your videos are most welcome. Thank you for making them and sharing with us!

[@BrockDavidson]

@64faffi , while I agree with you to an extent (sadly), I can say that the majority of our viewers are more sportbike oriented and many of them love to learn new things (the comments say it all). This particular American V Twin carb video is not really what they can relate to. If you sort our videos by most viewed, over 50% of our top 10 most watched vids are DYI based with several having over 200K views.

[@64faffi]

@@BrockDavidson Glad to hear that 👍

[@cooperman38]

This is the best video on the internet about carburettor over fueling. Thank you so much for taking the time to show this , its invaluable and so well explained . Cheers Brother from England

[@BrockDavidson]

Glad you like 👍👍

[@Allan-zv6cc]

I've only just discoverd this video - Thanks for providing the info - There was very little info online about the details of fixing this kind of problem. The details and clear explanations are really helpful and, of course, the principles are universal and transferable to other single and multi carb set ups. Many thanks.

[@johnmclean4911]

That's just nuts for a powder coater finish. You would differently think it had been spray painted. Just a amazing finish Brock. 👏👏👏

[@ryanliberty2384]

I'm a sport bike guy, I just really enjoy your informational style videos....I only work on a couple carburetors per year. Just rebuilt the twin carburetors on a Honda Shadow 750. The previous owner let it sit up until the gas turned into gel. Quick and easy job, a little after tuning, and now runs like it should. Thank you for what you do for the motorcycle community! I'm about to order every drag racing accessory you offer for my ZX-10R lol. And The woman that answered the phone hooked me up with the military discount! You guys are awesome Thanks again!

[@suzyfan]

A really good instructional video. Thank you for taking the time and trouble to make it. I've done this job many times, over the years and carry it out almost exactly the same way as you, but, as you say, there are virtually no videos here, instructing DIY owners on how to do it. Very well done, thank you. 👍

[@BradW.]

This is an incredible resource for carburetor info. Thank you!

[@JohnGarnerIII]

Thank you for this! This is my bikes exact problem, your time is valuable and i appreciate that you took a peice of your time and shared it to teach us what you know. Thank you.

[@ar2043]

I know that I'm late to the party, by two years… 😂... but that was a fantastic video Brock!!! Thank you!!!

[@jerrygarcia3086]

THANK YOU FOR THIS VIDEO!!! Your video is so informative and detailed!! Been searching forever for a video to explain this stuff for someone that hasn't dealt with carburetors much. You just solved my issues with my carburetor. Again THANK YOU FROM MINNESOTA

[@BrockDavidson]

Glad it was helpful!

[@atlyvwire]

Brock, perfect video!! Exactly what I was looking for. I have an 05 Dyna. That’s puking gas out of the carb when I shut it off. walked back out it was currently leaking. I’m going to check the petcock first, then go to the float. Thank you for your time and effort on this video. !!!!! Not only is fuel flowing from my petcock when the engine is off, I also have fuel coming out of the carburetor. I have both problems. 😮😮 Update: just fix the carburetor. Was exactly as you said it was. adjusted the float tang, Problem solved!!!!

[@BrockDavidson]

@Thompsons - thanks for your reply and glad to help. -BD

[@michaelsmartin5388]

75% thru your video and boy am I glad I switched to a Mukuni carb at my first upgrade on my 2004 Dyna. Could not get bike to get and type of gas mileage and it all got fixed with a new Mukuni. Again great video ! I need these videos 20 years ago.

[@BrockDavidson]

Lol, carbs were certainly a time consuming challenge. Glad you like our vids.

[@SoulO-HarleyDavidsonRides]

you are a star sir, thanks for the video - I have the same issue and now know how to fix it - greatly appreciated

[@williamwintemberg]

As usual, lots of outstanding information from a master.

[@reedjoyce6998]

This is the most informative video I have ever seen on Carburetors. I so appreciate you taking the time to do this. I have a Vulcan that I got as my first carbureted bike and I didn’t know much about carbs till i watched this video. I'm Pretty sure this is the issue I'm having as my gas is flooding my air box. I will check it all the way i was just taught by you. You earned my subscription.

[@BrockDavidson]

Glad it was helpful!

[@ciscojulian5552]

thank you for such a informative video on HD mods, much Aloha

[@BanditDarville-ef2pt]

love the color.sweet wheel swap,gotta be a hoot in twisties .carb gives me SL70 flashbacks.looks waaay better than it started.

[@michaelmitchell5909]

Fueling 525 cams wake up those older 88" twin cams

[@davidashton9580]

Nice one Brock 👍 From UK Dave 🇬🇧

[@grabir01]

If the float is plastic, shake it and make sure there is no fuel inside it. IF there is, you have a leak somewhere in the float. To find the leak, submerge the float in hot water will cause what air is in the float to come out and you will see the bubbles. Mark the spot where the air comes out. You may need to take a hot needle and make another tiny hole to drain out and let dry the float. Once dry,, use a soldier iron to melt/weld the holes shut. Test in hot water to make sure there are no more leaks. Done.

[@thegreatgunbantoad]

Brilliant vid mate. This is exactly what I needed.

[@traceywalsh7899]

U are awesome 4 making this video! Thx!

[@mr2scroll538]

Amazing job brock again, thank you

[@danfrenchie8083]

Awesome really good info thanks as Im having this issue with my 01 FXDWG

[@grabir01]

I use a penny nail with a hit on the bench grinder putting a flat nose on it . Works perfect as it is just slightly under the size of the float pin.

[@bertzx9r894]

LOVE IT!

[@boreshadave]

Thanks for your excellent video. I've been looking everywhere to help with my FXR leading gas. Your video was so simple to understand. Many of the other videos assume they are taking to an experienced mechanic. I thank you once again for making the whole process every clear and thankfully understandable.

[@BrockDavidson]

@boreshadave - you just described exactly why we shoot our videos like we do. When I was first learning about bikes, the "experts" would use terms I didn't understand and apply concepts without a thorough explanation. Fast-forward 25 years and I now realize that many of the "experts" were just doing/following advice others had given them and many did (do) not really understand why they do what they do---other than it works, so keep doing it. Not saying that's bad --I'm just saying that truly understanding what's happening allows you to critically think the process through - which helps you grow mechanically and solve even more complex issues the next time they arise. Glad out video helped :) - Brock

[@user-ry4hg4ec6q]

Excellent dude thanks for info

[@beardwrench]

The 2 "towers" for the pin that holds the float in place are different A cast-in arrow in the carb body at the base of one of the "towers" points at the rounded pedestal that has the interference fit float pin. The pin is a uni-form width throughout its entire length, so it can be installed starting from either end.The arrow indicates direction of removal. Tap the pin out from INTERFERENCE SIDE pedestal (in the direction of arrow). Install pin from LOOSE SIDE pedestal (opposite arrow) The arrow can be seen at 31:54

[@BrockDavidson]

@beardwrench - GREAT INFO! Thanks for sharing 👍👍

[@josephwilson2460]

Man thanks i just bought my first one and gotta do all that. Been sitting.

[@alexj835]

You’re 5 months overdue for a video Brock’s! Where ARE YOU AT??!!

[@michaelsmartin5388]

finishing up the Video and I see the e-3 plugs I changed to them and got 3-5 MPG better So to me - - the are better

[@yamtz750]

Cool build! I would like to feel that suspension and braking.

[@BrockDavidson]

You know where to find me 😁

[@yamtz750]

@@BrockDavidson 🏁🏁

[@hotelaldi]

Hello Brock. I'm waiting for your new videos. It's quite a while now you are not around KZbin. Please do some videos

[@wobblysauce]

Just needed a simple pre-filter to stop debris. Some can get sucked up and bend the seat enough for it to leak.

[@jesuschristiscallingyou953]

I couldn't care less about Harleys, but I care about this one. 😁👍

[@marklawrencelsingson9382]

Miss this guy where are u man why you don't upload anymore

[@BrockDavidson]

We have been taking a break from videos to work on pressing business issues. We will be back soon with more of the informative content you expect...and some new surprises that you didn't see coming ;)

[@t.s.racing]

Brock, even though you ignored my request for ceramic bearings, I'll still help you out. The CV carb needs to have the float level checked at 15-20 degrees, and the measurement is .413" -.453". Yes I blueprint these carbs for a living.

[@BrockDavidson]

@Boosted Twin Cams, I mention you in the video!, lol. Please forward a link to your procedure. What request for ceramic bearings?

[@superc910]

Awesomeness. On another note, hopefully you guys can wake up the current ZX-10R. Seems like nobody can get it flashed, tuned etc correctly.

[@BrockDavidson]

2021? It's on our list and in house...STILL waiting on parts to tune. 🤔

[@michaelmitchell5909]

Dude i never knew there was a water proof air filter. I gotta have one, just on your site and seen it for the sns stealth. Perfect. Whats the difference between the orange pleated one and the gray pleated one?

[@BrockDavidson]

Grey is the P08 which filters out particles down to 80 Micron. Orange is P037, which filters out particles down to 37 Micron.

[@michaelmitchell5909]

@@BrockDavidson thanks for responding and letting me know. I'll definitely be getting one of these.

[@farfromsilent23]

Hey brock! I when I hit the throttle gas shoots at the faceplate of my air filter (I have a glass fronted one so you can see into the carb). I watched this video to learn a little more about carbs and to see if i could figure out whats wrong. Is it possible for the jet that shoots fuel into the carb to be facing the wrong way? Because i see alot hit the glass when i rev it.

[@BrockDavidson]

Some fuel blowback is normal. If you see a stream of fuel hitting the glass, your accelerator pump nozzle might have rotated. When you pump the throttle, you should see a stream of fuel shooting in towards the engine as demonstrated in the video.

[@farfromsilent23]

I checked it. And it is shooting towards the engine. Every once in awhile i get a weird backfiring noise that comes from the carburetor tho so i thought maybe that was related.

[@BrockDavidson]

If it's occasional, welcome to a Harley with a carb! It's not a problem, especially if it primarily happens during startup or when the engine is still cold. If it's more frequent, that could be a sign of a deeper mechanical issue such as improper valve clearance, a spark plug going bad, etc... If that's the case, a leak down and compression test is in order.

[@popie6735]

Before you put the bowl back on make a trip to the hardware store. Pick up 4 allen head cap screws to replace the philips head screws that hold the bowl on. Makes things much easier...

[@BrockDavidson]

The folks who actually watched the video already know this tip ;) kzbin.info/www/bejne/j5fbgZljnNakgrc

[@TankToChest]

Someone’s not paying attention in class…

[@deletedaccount1150]

My 2001 sportster has a mikuni carb it sounds like it’s spitting out air and it is leaking fuel from the center of the bolts that hold the air filter housing the bike idols great you give it any gas it does the air gasp sound and dies out I’ve tried everything I can think of does anybody know what’s going on or what I do to fix this issue thanks for your time

[@BrockDavidson]

Have you performed a leak down and compression check? Almost sounds like a bent intake... assuming it's not a severe carb issue.

[@romesyoutubechannel5356]

I want to go with inverted forks on my 2011 WideGlide. Do you have a triple tree available for my model?

[@BrockDavidson]

One of these will work, select depending on your forks/wheel size etc: brocksperformance.com/v-twin/triple-tree-clamps/

[@romesyoutubechannel5356]

@@BrockDavidson Are they in stock now along with a swing arms?

[@BrockDavidson]

@Rome, our inventory is real time. If it says we have it...we do. If you have questions, use the blue support button on our site or give us a call. 937-912-0054

[@fattymcgee123]

Was this the same bike you and your son were working on a year ago or so? I remember something about a Harley project bike, another bike with 1 disc brake up front

[@BrockDavidson]

No. We will do a follow-up on that bike soon. Its taking shape.

[@fattymcgee123]

@@BrockDavidson sounds good, looking forward to it. I like the idea of a cheap bike realizing its potential.

[@Gursewak173]

Bro first time watching channel my question is how much does it cost to build h2 like boosted h2

[@BrockDavidson]

@Gursewak Sidhu - That's a better question for Adam to answer. I can tell you that he started out with our Stock-2-Brock package and then went up from there.

[@kawasaki_kid8704]

Closing down tuning because of the EPA and Califormia?

[@BrockDavidson]

Some companies in the industry are. We currently stopped selling exhausts and other emissions-related items into California. Supporting the #rpmact because if it doesn't pass, the performance world as we know it will vaporize :(

[@donproper3632]

Drill and tap those heads for air hose fittings and pump up some tires

[@kattiegodfrey1656]

I had a friend clean the carburetor on my 06 Honda shadow spirit 750vtx well its dripping fuel after he got done , he took the tank back off and it stopped so he said he didn't do anything to it ...we decided it must be a mall hole in my tank cause soon as we put the tank back on it starts dripping again...I do have a small hole on the top side of my tank...but it's leaking right out the carburetor in my opinion...any ideas? Anything he could have done wrong o make that happen

[@BrockDavidson]

I would need to know exactly where it's leaking from to be able to help.

[@kattiegodfrey1656]

@@BrockDavidson any information would be greatly appreciated!!!

[@kattiegodfrey1656]

@@BrockDavidson it seems to be coming directly from under the carb

[@BrockDavidson]

Send photos to [e-mail] and I'll try to help

[@colinm1325]

​@@kattiegodfrey1656 hey, did you sort that leak out?

[@exothermal.sprocket]

HD refuses to update their suspension and brakes to modern standards. It's like riding around on a 1970's era car suspension and brakes with very shiny chrome and fuel injection. Comon man! Your comments about the oscillation of Harley chassis reminded me of this clip from Jeremy Clarkson talking about 1970's American car suspensions. kzbin.info/www/bejne/ppvdoauVn7qId5I

[@BrockDavidson]

@Lifted_Above - that clip is hilarious! Thanks for sharing :)

[@exothermal.sprocket]

@@BrockDavidson Haha!! you're welcome

[@michaelmitchell5909]

Thats thing is bad ass guys...front cowl and fender would have looked better blue, in my dumb ass opinion of course....

[@TankToChest]

Not a fan of the Twin Cam but if you hand me a Carby Evo in a Softail springer frame I’d help you hide any number of dead bodies on any day of the week even Mondays. 😅

[@TankToChest]

And I HATE! Mondays…

[@djlancer88]

I wish my 85 maxim had one carb lol

[@Willemillions]

JS screws. Japanese standard I think. Not regular phillips head screws...

[@BrockDavidson]

@Will E. Millions - Great point! I should have mentioned that purchasing a set of JIS bits before the first carb disassembly is a real time saver: amzn.to/2ZXJCsu Just look for the dot on the bolt head to verify the screw is JIS. Thanks for the reminder!!

[@joekovacs247]

Can I have a job...? I will sweep floors and mop...lol C-Bus Road Glide

[@mr2scroll538]

Add 1 thing a lectron or smart carb you will be happy

[@BrockDavidson]

Have they fixed the Lectron's inability to smoothly reopen after being closed while street riding? I haven't used them in years, but this is why I ran 41 Keihin Flat Slides on my Bandit. The road course with Lectrons was a PITA...

[@mr2scroll538]

@@BrockDavidson smart man,👏 😎

[@MrGsxrme]

What the hell happen to the posts. You can't be that busy trying to bring us products for the gen3 hayabusa

[@Alexandre-zv8gd]

51 minutes dude. Why?

[@BrockDavidson]

Because if you understand the "why", you don't need to rely on KZbin for the "how"....

[@loganbehrends3286]

Just by the way more people would be interested in the video if you got to the point because gas is pissing out of the f****** bike right now

[@BrockDavidson]

Please read the long description for time stamps that quickly direct you to "the point".

[@mcskippster]

Tech talk, what a load of rubbish Harley's are.

[@BrockDavidson]

I used to say the same thing...but then I grew up and realized that all bikes are wonderful - some mechanically, some aesthetically, some socially. The one thing I can say about my Harley's is that there is always something to do and some place to go. I also add in extra time because it's almost impossible to stop and not have someone strike up a conversation about a friend or relative's H-D. It's much different than the sportbike crowds - except for the passion that we all share for two wheels.