Hey guys, gots issues with my carbs...

[JackPanzer]

Sorry to be asking for help with my first post, but I have to say you collectively have helped in many ways before I decided to join up. I just want to say thank you before I pose a big question.

So here it is: I'm having carb issues after putting on pod filters and a Mac 4-into1 exhaust. I've searched and Googled until my eyes bled and I can't for the life of my figure this crap out.

Here's the bike: http://imgur.com/plCepIk

I know, little bare, I didn't chop her up. But I like her like this.

Here's where the carbs are leaking out of(the hole on the bottom right.) http://imgur.com/XrxsQZ6

I've adjusted the float levels to spec, changed out the float needles, needle seats and floats with my other carbs(issue does not move with the parts), made sure the floats work with bowls off and it still leaks from there.

Here's the other side of the bike: http://imgur.com/orqYm30


Here's a tube that I have no idea what it does(Goggle didn't turn anything up): http://imgur.com/CCsKD6E


...What am I doing wrong?

[JackPanzer]

I know the carbs are dirty, windy day here. I have cleaned them and the floats and made sure to blow them out.

[BA80]

The tube (hose) you are showing there looks like the vent hose for the middle drive. At least it looks like the small hose that's connected to the top of the engine case. If that's what it is it doesn't hook to anything. There should be a small bracket that mounts to where the center bracket for the stock airbox bolts. It just vents under the seat.

I had a similar issue with one of my old style carbs with the brass floats. The float had a pinhole in it and was filling with gas and sinking. I found it quite by accident when I was tearing into the carbs for the umphteenth time. I shook the float and heard the gas sloshing inside. You might want to check that out.

Are ALL the carbs leaking or just one. Those floats have to be set perfectly and BOTH sides must be even. What spec are you using?

[JackPanzer]

The tube (hose) you are showing there looks like the vent hose for the middle drive. At least it looks like the small hose that's connected to the top of the engine case. If that's what it is it doesn't hook to anything. There should be a small bracket that mounts to where the center bracket for the stock airbox bolts. It just vents under the seat.

I had a similar issue with one of my old style carbs with the brass floats. The float had a pinhole in it and was filling with gas and sinking. I found it quite by accident when I was tearing into the carbs for the umphteenth time. I shook the float and heard the gas sloshing inside. You might want to check that out.

Are ALL the carbs leaking or just one. Those floats have to be set perfectly and BOTH sides must be even. What spec are you using?

The number 2 carb and the #4 carb (Left to right) are both leaking, depends on which petcock I turn on. The floats are set at 27mm, but I've tried them at 23mm as well. The floats needles and seats work fine.

[natemoen]

The number 2 carb and the #4 carb (Left to right) are both leaking, depends on which petcock I turn on. The floats are set at 27mm, but I've tried them at 23mm as well. The floats needles and seats work fine.

Well, start off by setting the floats correctly. They should be at 25.7mm measured from the gasket mating surface with the gasket removed.

[BA80]

Well, start off by setting the floats correctly. They should be at 25.7mm measured from the gasket mating surface with the gasket removed.

What nate said for sure. Also, on those 79 carbs there are 2 sets of T's. The upper set is for venting the bowls an should be clean and clear but NOT have the fuel lines connected to them. The lower set are the fuel inlet T's.

[Winterhawk]

Don't get mad at me for this dumb question but I did this once.

You wouldn't have the fuel supply going into the vent tubes instead of the bottom T's would you? Don't get mad for asking but I did do this once and the same thing happened. LOL

[Winterhawk]

BA80 beat me to the question by 2 min while I was typing so I guess I'm not the only one who thought the fuel was going to the vent hoses.

[BA80]

Ha ha.... your not the ONLY one who's made that mistake Larry.

[JackPanzer]

The vent lines are clear and not comnected to the petcock or anything else. i will set the floats to 25.7 shortly. I'll update as sson as I find out if the works.

[BA80]

One thing I've found that helps seal those brass on brass needle and seats is if you designate each needle to it's seat and before installing the float drop the needle into the seat and lightly tap it in to create a good sealing surface between the two. If you understand what I'm saying.

Even at that sometimes mine will flood randomly if I forget to turn the petcocks off. Sometimes it will but most of the time it doesn't.

[MPittma100]

Fuel Leaking

After you set (both) float heights per carburetor correctly, put fuel to the carbs OFF of the bike. Hold them level and remotely let fuel fill the bowls. Tilt the carb bank to duplicate the angle of the bike on the side stand. Any leaks found here can be corrected prior to installing them onto the bike. Sometimes a light tap on the bowl will stop a leak.

Most often, any disturbance of the fuel system - taking lines on and off, cutting lines to add filters, etc. induces foreign objects into the system and can get stuck in the float valves. It is a good idea to let some fuel run out of the lines into a container prior to hooking them up to the tee fittings on the carbs.

You will ultimately get them to stop leaking. All of us have had these same issues. Be patient.

[JackPanzer]

After you set (both) float heights per carburetor correctly, put fuel to the carbs OFF of the bike. Hold them level and remotely let fuel fill the bowls. Tilt the carb bank to duplicate the angle of the bike on the side stand. Any leaks found here can be corrected prior to installing them onto the bike. Sometimes a light tap on the bowl will stop a leak.

Most often, any disturbance of the fuel system - taking lines on and off, cutting lines to add filters, etc. induces foreign objects into the system and can get stuck in the float valves. It is a good idea to let some fuel run out of the lines into a container prior to hooking them up to the tee fittings on the carbs.

You will ultimately get them to stop leaking. All of us have had these same issues. Be patient.

I do appreciate all the help and advice guys, I understand it takes patience and I just need morevof it. Hahah. In the meantime, I will be trying to reset the floats tonight and I'll let you know when I do. Thanks again for all the months I never registered because you guys fixed all my issues beforehand.

[TopCatGr58]

Hey Jack,

One thing I didn't see in the photos were INLINE FUEL FILTERS. You can't rely on the IN TANK filter towers that are part of the petcocks! Small pieces of debris, ie. scraped up inner fuel line as well as just rust and such from the tank will get into the carbs between the float needle/seats and cause them to not seal=flood!

Also, the vent hoses need to be OPEN to vent....not just connected to each other, folks often will put a fuel filter on the end to keep moisture and bugs out, but still provides the venting function.

I also didn't see it, but it might be on your carbs....do you have the OCTOPUS vacuum controlled valve....has a lot of fuel lines going to it and then to the carbs??

T.C.

[JackPanzer]

Hey Jack,

One thing I didn't see in the photos were INLINE FUEL FILTERS. You can't rely on the IN TANK filter towers that are part of the petcocks! Small pieces of debris, ie. scraped up inner fuel line as well as just rust and such from the tank will get into the carbs between the float needle/seats and cause them to not seal=flood!

Also, the vent hoses need to be OPEN to vent....not just connected to each other, folks often will put a fuel filter on the end to keep moisture and bugs out, but still provides the venting function.

I also didn't see it, but it might be on your carbs....do you have the OCTOPUS vacuum controlled valve....has a lot of fuel lines going to it and then to the carbs??

T.C.

Octy's been off for a while. Was spewing fuel, moreso than my carbs. Inline filters are there as well