Question about 1998 Honda VF 750 C Magna

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I have a gas lick is a drip from the petcock .... i change it for a new one and still dripng gas .... it came with a spring and i dont now how to replace it

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Go to the dealer he can show u for free--also make sure that pcock is tite to the tank for no seepage

Posted on Sep 30, 2010


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After winter service on my Honda Magna VF750. Still runs, but gas drip underneath tank. Possible gasket damage? What all needs done? Change oil and filter and what else?

You may have a loose fuel line after doing your winter service. Check that they are all snug. If the petcock had force applied to it, you may have damaged the petcock and will need a replacement.
Also check the bottom of the tank and the seams, ensure that the tank isn't rusting from the inside out. I had a V65 Sabre do that once - from previous owner improperly storing bike with only a tiny amount of gas in tank.

Apr 22, 2015 | Honda Motorcycles

1 Answer

Harley turns over but does not fire i checked fuses they are good i drained the fuel tank to make sure there was not any thing in the filter but i dont know if it is getting gas gas does not come out of...

You didn't say what year or model your bike was so I'll just take a guess here. In 1996 and later, Harley started putting vacuum operated petcocks on their bikes that are equipped with a carburetor. It should have a small vacuum line running to the backside of it unless someone has changed the petcock to a manual operated one. The vacuum line comes off the backside of the carburetor and supplies vacuum to the VOES switch and the petcock.

If it is a vacuum operated petcock, it will have a square plate on the backside with four small screws holding it on. Take the screws out and carefully remove the plate. Notice how the stuff in there comes out. There is a spring, a needle, and a diaphragm in the petcock. Hold the diaphragm up to the light and gently stretch it while looking for a hole. If you find one, put a new diaphragm in the petcock. Upon reassembly, connect the vacuum hose and turn the petcock to the normal run position. Leave the fuel hose off and spin the engine. Fuel should flow from the petcock. If you have a hand operated vacuum pump, you can connect it to the petcock and apply vacuum to get the fuel to flow.

Personally, I suggest changing the petcock to a high quality manually operated petcock and turn your fuel on and off manually. Old School style. Pingel makes a very high quality petcock. They aren't cheap but you'll never have another petcock problem.

Good Luck

May 16, 2011 | Harley Davidson FLSTF Fat boy Motorcycles

2 Answers

2005 1200 s. Since not being ridden for 6 to 8 weeks,gas has leaked into crank case.Fuel tap has no shut off,so I assume there must be a vaccume activated diafram,of sorts,in the tap.Could this be...

Either the vacuum operated petcock is stuck in the flow position as well as a float needle is stuck in the open position. Two things would have to be wrong so that the fuel would over flow the carburetors and run past the piston rings into the crankcase. Or, more likely, the vacuum diaphragm inside the fuel petcock is leaking and the fuel is flowing down the vacuum line into the engine. I would start by inspecting the vacuum fuel petcock. If you unplug the vacuum line and gas is dripping from the vacuum line then you will need to rebuild or replace the fuel petcock.

Mar 06, 2011 | 2005 Suzuki GSF 1200 Bandit S

1 Answer

Hi I have bought a 1985 700 maxim watercooled it has been sitting for appr 2 years today I took carbs out, disassembled them, cleaned them w carb cleaner and put them back in in addition to that I...

If I understand "the petcock was in prime position and it eventually quit dripping."
Prime = on
Sound like the needle rubber was hard and after a while they soften up enough to cut off the fuel.
Keep an eye on it and ride safe.

Feb 02, 2011 | 1985 Yamaha XJ 700 X Maxim

2 Answers

Fuil in air box getting in oil dr200se year 2005 have carb soaking now olny 500 miles cant be worn may be the dry rot o ring in pet **** so far all the diaframs good in pet **** and diafram in top of...

What you are dealing with is a vacuum petcock with a bad vacuum diaphragm , in this case fuel is bypassing the petcock via the vacuum line and filling the engine (oil) with gasoline.
If you have a standard petcock that is leaking (not shutting off properly) or just left in the on position a stuck float needle will also fill your engine (oil) with gasoline. This can happen with a clean carburetor and a good float needle. It just sticks and you have to change your oil. If you have the kind of fuel petcock that allows you to turn it off when not in use , always turn off your gas when not riding.
You will have to change your oil if it is fouled with gasoline. I suspect a vacuum operated petcock is at fault. With standard petcocks I have seen new motorcycles in perfect order stick a float needle ( Kei Hin Carburetors ) and fill there engines and air boxes with gas/oil mix. On vacuum petcocks the diaphragm that shuts off the fuel flow is usually leaking and at fault.

Jan 01, 2011 | 2001 Suzuki DR 200 SE

1 Answer

My 1998 Dyna has a small leak or drip coming from petcock

Sounds like you have a hole in the vacuum diaphragm that opens and closes the petcock. This is one of the problems with the vacuum operated device. The other problem is that sometimes they don't open and you're left stranded with a full tank of gas and not a drop in the carburetor. I changed to a manual operated petcock. Personally, I'd rather have a Pingle petcock than another vacuum operated Harley petcock. If you do change to a manual operated petcock, don't forget to plug the small vacuum hose.

If you want to keep your vacuum operated device, I think you can buy a replacement diaphragm. You will have to drain the tank and remove the petcock. There are four small screws on the backside. Remove the screws and the backplate will come off. The diaphragm and a sping is all that is in that section of the petcock.

Mar 31, 2010 | 2000 Harley Davidson FXDWG Dyna Wide Glide

1 Answer

Gas in oil (2007 shadow spirit)

The gas must be passing in through the inlet via the carburator/s which seems to be flooding.
Remove the carbs and check the float pins and adjust.
Please dont forget to replace the oil filter as it must be full of gas too!
Check the petcock too ...maybe the auto shut off isn't functioning!
Hope this helps!

May 23, 2009 | Honda VT 1100 C Shadow Spirit Motorcycles

4 Answers

I own a 2004 TTR-225-S and when we try to start it will not get any gas to flow to the carburator

remove fuel line from petcock and see if fuel runs out, if not remove petcock from tank and clean filter screen, if it does come out, check for inline fuel filter change it, if it dont have one check fuel pump if it has one, or could be diaphrams in carb split and not building vaccuum to draw gas thru

Apr 11, 2009 | 2004 Yamaha TT-R 225

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