1980 carb float setting

[BA80]

What do y'all se your G and SG floats at? The book says 23mm but that's way too high, I have them set at 24mm now but it still floods when sitting with the engine off and it loads up at stop lights.

Gonna try 25mm next.

[Schming]

23mm

I set my '80G at 23mm and the following pic is where my running fuel levels are:



But I'm still dialin' her in and not sure if I'm too lean. I may raise the level a mm before I change any stock jetting.

[Ranger_xs1100]

I set my LG at 23 and it seems to be fine.

[BA80]

Pretty sure I have some leaky float valves. I got them set at 25mm now and it's still doing it. And yes, I did replace the O-rings on the valve seats.

There is one float with some damage also that may be causing a problem.

[skids]

What do y'all se your G and SG floats at? The book says 23mm but that's way too high, I have them set at 24mm now but it still floods when sitting with the engine off and it loads up at stop lights.

Gonna try 25mm next.

Joe, next time, turn them right-side-up and blow into the fuel supply hoses. If they are sealing, you will probably know it.

Other things are,
1. Leaking seals/o rings for specials at the fuel valve in the carbs,
2. Blocked breather lines for older carbs, Note: you can't use a newer air box with older carbs and hook up vent hoses to the air box nipples.
3. Floats not able to function correctly due to contact with gasket or other,
4. Crusty float pivot action,
5. Debris on fuel valve or other reason for seal failure,
6. Pin of fuel valve needle is sticking (leaking valve).

[BA80]

Joe, next time, turn them right-side-up and blow into the fuel supply hoses. If they are sealing, you will probably know it.

Other things are,
1. Leaking seals/o rings for specials at the fuel valve in the carbs,
2. Blocked breather lines for older carbs, Note: you can't use a newer air box with older carbs and hook up vent hoses to the air box nipples.
3. Floats not able to function correctly due to contact with gasket or other,
4. Crusty float pivot action,
5. Debris on fuel valve or other reason for seal failure,
6. Pin of fuel valve needle is sticking (leaking valve).

LOL.....I ain't Joe.

I cleaned these carbs quite well and replaced the o rings as I said. Everything mentioned has been checked. Using old parts though.

[HalfCentury]

What do y'all se your G and SG floats at? The book says 23mm but that's way too high, I have them set at 24mm now but it still floods when sitting with the engine off and it loads up at stop lights.

Gonna try 25mm next.

Flooding sounds like the seat/needle seal is leaking. You know more about this than lots of people. Did you replace all the soft parts?

[BA80]

Flooding sounds like the seat/needle seal is leaking. You know more about this than lots of people. Did you replace all the soft parts?

Old valves. See post #6

[MPittma100]

Float setting

Hi Greg AKA Joe,

I've had the best results with the highest float setting. I've also found, when using the tubes for checking, that it verifies the need for the highest setting. The last Venturer carbs I did needed a little more than spec to get proper tube level. And it does appear that some new float valves are needed.

YOU COMING TO XSSE?

[RichW1064]

isn't there a carburetor-less float solution..? seems to me, oh several years back I recall hearing about the "electron carb"... am I the only one to hear of this thing? had one on a old 85 dirt bike, worked well, but cant seem to find them anywhere... was I dreaming or in a state of wishington..?

[skids]

LOL.....I ain't Joe.

I cleaned these carbs quite well and replaced the o rings as I said. Everything mentioned has been checked. Using old parts though.

Sorry Greg! ...and Joe.

[BA80]

YOU COMING TO XSSE?

Not looking good Mike. I got the time off work but other factors are not working out.

[MPittma100]

Xsse

Not looking good Mike. I got the time off work but other factors are not working out.

I'm sure you will continue to try. Good luck. Hope it works out for you. Charlie Haas, Bohn Frazer, and maybe Karla Jones (The Jones Gang) are going to attend.

[mack]

Greg

I feel for you man. I've had some that just will not hold. I had set of LG carbs I was going to sell to Dwayne Potter but I couldn't get them to stop leaking. The inlet valves would hold for a few hours then randomly leak over night. Drove me crazy because it wasn't the same one that would leak at any given time. I've been working with Mike at Jets R Us to determine what the real numbers for genuine mikuni carb are. We have determined that their charts are incorrect and that while the site says "genuine mikuni" they are in fact mostly packaged by K&L. As a side note K&L IS just a packaging company not a brand name so they buy in bulk at the cheapest price ans what you get may be from china, Pakistan, Chec republic or mexico. You'll find that the needle heights can change dramatically:



For the 1980/81 carbs the only one that would seat and seal properly is the 18-4676 but it may come without the mikuni stamp and in fact be a K&L imposter ($8.99 makes me suspicious because you look at all the other mikuni seats and they are three times that price) and not seal. So the 007-503 number is actually a threaded seat. My advice is to state quite firmly that you only want 18-4676 that are in fact genuine mikuni with the stamp! The other issue is that mike won't have any in until mid September so I'm waiting for twelve myself.

[mack]

Greg

don't be put off that the pictures show metal needles, it just happens that it was the only picure I had handy on photo bucket. It's the same issue with the viton tips. I had some of mine at 27mm with the tang almost bent straight down and they still wouldn't seal properly for long.