Just wanted to share this little experience I found, so no one has the same fate. I removed my gas tank and changed out all my plugs and cleaned my air filter. I notice a build up on the top of the cyclinder cover right under the fuel vacuum valve. heres a pic of it in case you dont know what im talking about http://www.ebay.com/itm/96-Honda-VF750-super-Magna-Vacuum-Fuel-Valve-/201090277256?pt=Motorcycles_Parts_Accessories&hash=item2ed1ea1f88&vxp=mtr (http://www.ebay.com/itm/96-Honda-VF750-super-Magna-Vacuum-Fuel-Valve-/201090277256?pt=Motorcycles_Parts_Accessories&hash=item2ed1ea1f88&vxp=mtr) it goes from the petcock over to this valve on the right side. it has four phillips screws that i found were loose and leaking fuel all over my cyclider top cover. it was an accident waiting to happen. i tightened all four screws and the leak stopped and has not leaked since. just thought i would share in case someone else is having this issue. i dont know how long it has been doing it, but i know my fuel milage changed two months prior and now has been restored. Happy riding.
Good you found that, you should have had a strong gas smell while it was leaking.
That vacuum diaphragm valve has always been major PIA. Valks have similar ones and I finally pulled all of mine and replaced them with Pingle valves.
They are a good idea, but wear out after time (rubber insides) and then they leak.
Yours may have been retrofitted with a replacement diaphragm because I believe all of the factory ones were riveted together and the fix was to drill out the rivets, replace the bad diaphragm and screw the halves back together.
Here's the mischief maker: http://www.ebay.com/itm/Auto-Petcock-Cover-Valve-Set-01-07-VT600-Shadow-98-03-VF750-C-Honda-Magna-P45-/231263751012?pt=Motorcycles_Parts_Accessories&fits=Model%3AMagna+750&hash=item35d864cb64&vxp=mtr
believe it or not the gas smell wasnt that noticable due to the dripping and not flowing. i did notice a little smell but i thought it was from the exhaust. i know better now and lesson learned. thanks for all of your responses.
hey smoked, can you please post a link to the pingle valve that you used when you changed out the fuel vacuumn valve. i want to change mine out and want to make sure i get the best. i have a 1996 vf750c
There iz a rebuild kit sold by Honda, but it's not on the schematic drawings... someone posted it up some time ago. A search might find it... I bought one but never used it.. I have it somewhere
Quote from: hootmon on July 25, 2014, 04:55:46 PM
There iz a rebuild kit sold by Honda, but it's not on the schematic drawings... someone posted it up some time ago. A search might find it... I bought one but never used it.. I have it somewhere
Yes I think you unscrew and replace the diaphragm, I need that number to post on the FAQ section.
Edit - the part number is now in the Magna FAQ section under Gas Fuel Shut-Off
The kit is PN 16953-MN5-023
Quote from: TLRam1 on July 25, 2014, 05:13:07 PM
Quote from: hootmon on July 25, 2014, 04:55:46 PM
There iz a rebuild kit sold by Honda, but it's not on the schematic drawings... someone posted it up some time ago. A search might find it... I bought one but never used it.. I have it somewhere
Yes I think you unscrew and replace the diaphragm, I need that number to post on the FAQ section.
Edit - the part number is now in the Magna FAQ section under Gas Fuel Shut-Off
The kit is PN 16953-MN5-023
Thanx Terry
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Pingel sells a vacumn fuel valve but it is not cheep about a 100 dollars I have one ordered for my super just google pingel and search vacumn fuel valve it is a universal one. I will review it after I get it installed
Pingel In-Line Vacuum Fuel Valve 9050-AV
List Price: $124.95
Our Price: $92.38
Pingel In-Line Vacuum Fuel Valve 9050-AV
List Price: $124.95
Our Price: $92.38
Description
Shuts off the flow of fuel to the carburetor whenever the engine shuts off Ensures a minimum of fuel spillage out of the float bowl vent if the motorcycle is dropped on its side, helping keep fuel off a hot motor Perfect fit for riders who need every drop of fuel available Installs easily into the existing fuel line and includes an auxiliary vacuum, hose barb to install wherever there is a vacuum source on the engine CNC-machined from billet aluminum with a matte gray finish; 5/16in hose barbs Made in the U.S.A.
© Copyright 2014 Powersport Superstore, Inc. Go to main site
heres another question while we are on the topic. i was looking for a fuel filter on the bike, but i dont see one at all. it goes straight from the petcock to the fuel vacuumn valve to the carbs. should i stall one from the tank to the petcock are is it okay the way it is. just curious.
There is a filter in the tank attached to the pet cock. It is a screen that can be replaced
The Pingle cutoff valve #4321-CH (this is the petcock replacement not the in line vacuum cutoff) replaces the stock petcock and the synthetic in tank filter. The beautiful thing is the Pingle valve is precision machined from stainless steel and the in tank filter on top of it is also made from stainless. This is the last petcock valve/filter you will ever need to buy. They are pricey, but pay for themselves in the long run. Make sure you order one for your specific year model because I believe the thread diameter is different for the 3rd Gen and the earlier models.
http://www.pingelonline.com/pc_combined_results.asp?search_cat=searchexact~pcpcm.parent_pc_id~3E461507A29547E8B3F7341BFB4A9A6D&pc_id=3E461507A29547E8B3F7341BFB4A9A6D
The original Honda in tank filters are being ruined by ethanol in our gas. It makes them swell (and they are a b*tch to get out of the tank) and it makes them very hard and brittle (so they break off in the tank and you can't get them out). You must remove the old in tank filter element and the o-ring out of the tank before installing the Pingle assembly.
I don't recommend installing an in line filter in this case because it will only restrict fuel flow and the 3rd Gen is gravity flow (no fuel pump)
I received my valve and have it installed it works as it should it's fairly small and easy to install unlike the 3rd gen there is no rebuild kit for the super so this was my only option or try to remember to shiut off gas ever time I stop, not hard, but easy to forget now I don't have to remember.