Question about 1992 Suzuki DR 350 S

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My '92 drs 350 has a leaky fuel petcock. it is a vacuum assist type. What would happen if I override the vacuum assist by just installing a solid gasket in place of the diaphram assembly? Flooding, leaking carb? or just epa stuff?

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It may be ok , but many bikes flood when sitting over night and fill the sump with fuel. if the carb float doesnt quite seal.
Not sure about epa , I think it shouldnt be a problem unless carb overflows and drips on the ground, during the inspection.

Posted on Jun 01, 2010

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I have a honda 50 2007 and i took apart the carb cleaned it thoroughly, replace the on off valve and sdpark plug. it ran great for a couple of days. now it starts first kick runs for a minute or so then...

sticky float needle- run some seafoam through a tank of gas- also check for vacuum leaks as the petcock on bikes with a petcock are usually vacuum operated off engine vacuum.. if disconnected or leaky- that will starve the engine once the fuel in the float bowl is used up.

Jul 11, 2014 | 2007 Honda Shadow Aero

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What will happen when you by pass the vacuum seal on a fuel shut off for a 883 sportster

Hi Anonymous, nothing bad your new fuel valve will work just fine, just remember to block off vacuum line with a plug or something simular. The vacuum line fuel valve was designed so when the engine is not running no fuel can get pass the fuel valve no matter what position you accidently left the lever in. Also FYI they do make a rebuild kit for your stock fuel valve. Good luck

Apr 11, 2014 | 2001 Harley Davidson XL Sportster 883

1 Answer

Does a pit **** ever go bad or just cleaned?

I'm going to guess that "pit ####" meant petcock :-) and yes they do "go bad" in a number of ways. There is a diaphragm inside which can crack over time. There is also a diaphragm return spring which may break (I've seen only one like that though). But most often, the use of fuel with ethanol in it will cause the breakdown of the plunger seal. When that happens, the petcock "leaks".... not externally but internally. The Maxim-X has a vacuum operated petcock which is supposed to only provide fuel to the carbs when set to PRI (prime) or when set to ON while the engine is running. When the engine is off, there should be no flow of fuel. But the damaged plunger seal allows fuel to flow from the gas tank to the carbs at all times, even when the engine isn't running. When you combine that leak with a leaky float valve, the result is usually a crankcase full of gasoline - clearly not good. If you'd like to know all there is to know about the XJ700X / XJ750X petcock, visit the following page on the Maximum Maxim-X web site:
Maximum MAXIM Resource for 1985 86 Yamaha 700 750 Maxim Models XJ700X...
There are also some helpful tips for rebuilding the petcock here:
...with supporting pictures here:
Index of pix petcock
Hope that helps.

Jan 15, 2014 | 1985 Yamaha XJ 700 X Maxim

1 Answer

I changed my petcock on 2000 dyna wide glide it had a vacuum assist but I put a reg. petcock on trying to save money and plug off the the vacuum line but sometimes the bike will die and also notice fuel on...

Hi Anonymous, and the usual suspects are:
1. Damaged or restricted fuel tank venting system.
2. Loose float bowl screws.
3. Damaged float bowl o-ring.
4. Improper fuel level in float bowl.
5. Worn or dirty inlet valve or seat.
6. Damaged or leaky float assembly.
7. Particle contamination in inlet fitting cavity.
8. Ethanol sludge, dirt, rust in bottom of fuel tank
Good luck

Jan 23, 2013 | 2000 Harley Davidson FXDWG Dyna Wide Glide

1 Answer

No fuel getting to carbs

If you have a vacuum operated fuel petcock, it should also have a "prime" position. That should let the fuel flow without vacuum from the engine. If this solves your fuel starvation problem, I would double-check to see whether the the replacement petcock gasket(s) may have shifted just enough to block some little pinhole that's required for vacuum equalization. That has happened to me--the replacement gaskets aren't exactly the same as what was originally in there.
You can also test the vacuum release of the fuel petcock without taking anything apart. Put a mity-vac (a hand-pumped vacuum pump) on the vac line to the fuel petcock and see whether you can get the fuel to flow. Harbor Freight sells a cheap mity-vac type pump for under $20 when it goes on sale (which it does regularly).
Good luck!

Dec 06, 2011 | 1982 Suzuki Gs 550 L

2 Answers

About after a min of the bike running gas starts flowing into the air box, its alos getting into th oil

First check to see if the oil level in your crankcase is too high. If you have a vacuum petcock malfunction (hole in the diaphragm) or if the fuel petcock is left in the prime position and a float needle sticks, then you get you get gas running into the cylinders, past the rings, and into the oil.
When you start your motorcycle the oil/gas mixture has no place to go, the crankcase is too full, and the mixture exits through the crankcase breather into the air box where it will ruin a paper air filter. Always turn your fuel petcocks off when not driving. If the petcock diaphragms are bad rebuild the petcock with K&L rebuild kits or replace the fuel petcocks with new ones. If the float needles in the carburetors are bad or sticking, take the carburetors apart, clean them, and replace any worn or damaged parts You will have to change your gasoline saturated oil for it will no longer properly lubricate your motor.
Just a note: in 1983 brand new Honda's would fill there engines in gas. All the components were clean and new. This can happen to any machine in any condition at any time. When not riding always turn off the fuel vales never leave them in the prime position.

Mar 21, 2011 | 1982 Yamaha XS 400

3 Answers

Fuel mixing with oil in crankcase

Answer #1 is spot on! Get the carbs professionally cleaned and set. They will inspect the needle/seat assemblies (or SHOULD) and replace as necessary.

Jan 16, 2011 | 1999 Suzuki GSX-R 600

1 Answer

I have a 2001 dyna low rider. This winter I took the tank off to paint it. I put everything back together and fired it up and got a block before it shut down. I got it back home and checked the fuel lines....

It sounds like the carburetor is running out of gas. If you have the original petcock on the tank, you MUST have the vacuum line connected. When the engine starts up, vacuum from the carburetor is applied to the vacuum diaphragm in the petcock and opens the petcock. Without vacuum on the petcock, the only fuel you will get to the carb is if the needle valve in the petcock leaks.

Now, you said you had the tank painted. This is the clue. Painters pay a lot of attention to the outside of the tank but NONE to the inside. I would guess that the screen on the inside of your tank is completely blocked with small chips of paint or sanding material.

Replace the vacuum operated petcock. It's a "Motorhike" waiting to happen. A "motorhike" what you do when your bike quits and you wind up pushing it. I've seen too many of these things leave people stranded with a full tank of fuel but not a drop in the carb. Replace the OEM petcock with a high quality manually operated petcock like the old timers use. A Pingle is a very good choice. If you want to save a few bucks, check on the price of an OEM petcock for a 1995 or earlier model. Block the vacuum line off and I'd advise an inline fuel filter. Buy the sintered metal type filter that can be cleaned. These filters come in Chrome, and a few anodized colors as well.

See if this helps.

Jul 14, 2010 | 2001 Harley Davidson FXDL Dyna Low Rider

1 Answer

Vaccum lines from carb, where do they go?

Check the fuel petcock to see if there's a similar-sized fitting.

Most carbureted motorcycles use vacuum lines for one thing only: To apply vacuum to the fuel petcock so it'll turn the fuel supply on ONLY when there is vacuum being applied.

Though the same bikes also typically have positions on them that override the vacuum safety system.

"Vacuum safety system"?


Unlike a car, most bikes carry their fuel ABOVE the carb, and instead of a fuel pump, use gravity to feed the carbs. If you've got a petcock that's always open, only the float needles in the carbs hold back the fuel flow, and these are prone to being held at least partially open. The tiniest speck of debris can do it.

And the results can range from annoying to catastrophic.

If the fuel is flowing into a carb while the bike is parked, you can fill a cylinder and, when you hit the electric starter with good battery power, you can bend a connecting rod since liquids cannot be compressed. The piston will slam into the incompressible liquid and if the starter's stout enough, there goes a rod.

Or if the fuel leaks into a cylinder whose exhaust valve is open at the time, the bike will start but sometimes you're left wondering what that loud bang was and why are you feeling so warm and where on earth did that muffler go?

You should get this taken care of quickly because if I'm correct about this line, not only are you having to use manual override positions on the petcock (not a biggie -- the vacuum part is a frequent failure point -- just turn the petcock off when you park it), you have a vacuum leak which can result in at least poor running and though the leak is quite small, there's the possibility of running too lean and burning a hole through a piston, which kinda sucks.

Jun 01, 2010 | 2005 Honda VT 750 DC Shadow Spirit

1 Answer

Where could I find a fuel line diagram for a 92 Yamaha XJ600 Seca II?

For the fuel pump portion you can go here -

Two hoses come from the intake area under the carburetors - the small hose on the left side (facing front) which is directly under #1 intake goes to the Fuel Petcock vacuum input. The hose under #2 intake goes to the Fuel Pump - vacuum intake (marked with P). The left side of the fuel pump is the input for fuel - the right side is the output for the fuel pump - the hose goes up to the small T input between carburetor 2 and 3. The input for the fuel pump has an inline fuel filter and that runs up to the Fuel Petcock fuel outlet.

Jan 20, 2010 | 1992 Yamaha XJ 600 Diversion S

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