Petcock replace without vacume

[jdp]

I would like to replace my petcock without a vacuum line which one is the most popular everyone is using

[Challenger]

Part #  16950-mal-603
Honda CBR600 vacuumless petcock

[Willow]

One can convert the OEM petcock to be non-vacuum driven.  In so doing one maintains the original presentation and switch positions.

[Sixgunluvr]

One can convert the OEM petcock to be non-vacuum driven.  In so doing one maintains the original presentation and switch positions.

Do tell...

[Willow]

One can convert the OEM petcock to be non-vacuum driven.  In so doing one maintains the original presentation and switch positions.

Do tell...

link to Tech board discussion on coverting the petcock

[Pluggy]

Disabling the vacuum side is no guarantee of reliability.

On my bike, the "manual" side of the valve failed. Turned it on and rode a mile, then fuel starved. After my rescue, testing showed the vacuum side worked but the manual side barely flowed. Disassembled the valve and found the vacuum side was perfect. The shaft on the valve was much harder to turn than the replacement.

If that valve was modified to eliminate the vacuum, it would still have failed. Before modifying an old valve, consider buying a new one.

[John Schmidt]

I've modified the OEM by opeing it up, removing all the guts, and replacing with o=rings where the diaphragm orinally sat...takes two different sizes but don't recall them just now. Plug the vacuum intake and the litle drizzle tube, you're now totally mechanical with the same mount and appearance. The best part is no more fail prone diaphragm apparatus internally.

[Pluggy]

Hey, John.  You know the vacuum valve is there to respond to an accident.  In an accident, the "tip over" switch stops the engine.  With the engine off, the vacuum is off and the fuel valve closes.  That keeps fuel from flowing out through the carbs, over the engine and possibly catching fire.

None of us plan to have an accident.  As there is that possibility, modern bikes have the "automatic off" features built-in.

[-mike-]

To keep the petcock membranes healthy just install a vacuum snubber in the control hose.

See old Tech talk archives for details.

Works flawlessly on my Valkyrie for years now.

[98valk]

how to modify oem to manual. I also drilled mine for higher flow, however can't go back to vacuum operation after drilling.

https://www.valkyrieforum.com/bbs/index.php/topic,37577.0.html

[98valk]

https://www.daughertymotorsports.com/howto/tankvalve/tankvalve.html

[ridingron]

On my other Honda bike forum, a known to be knowledgeable member said a snubber was built into the valve"s casting. I've never checked the numbers but that valve looks identical to the Valkyrie valve.

As a side note, the valve is often deleted on the other bike. One of mine now resides about 40' off the south side of I-40 in Arizona. Many years ago, right after the turn of the century, I was setting on the side of the road with a dead bike and about to die from heat exhaustion. No cell service. I wasn't young and dumb, just dumb. I finally determined it wasn't the filter but the doodad before the filter. The doodad was the infamous vac. fuel valve. I did a bypass and the bike ran for about 10 minutes and the temp. gauge was headed into the red.  Ran it up the shoulder for 1/4 mile and back. It was nice that the cars coming at me were flashing their lights and honking their horns but I would really have appreciated if they had moved over a lane. I reassembled the bike and never had another problem the rest of the way home or since. I ended up owning 7 of the bikes over the years and deleted the vac. fuel valve on every one of the bikes. I still regularly ride 2 of them with zero problems.

My current Valk is not in use currently due to a leaking valve. I ordered the non-vac. valve and will be installing it in the next week or so.