Honda CX 500 Forum banner

1 - 9 of 9 Posts

·
Registered
Joined
·
2 Posts
Discussion Starter #1
I have the petcock itself but I dont have the packing or filter that goes with it and im having a hard time finding replacements. Any idea where I can get some?
202607
 

·
Registered
Joined
·
1,599 Posts
For a very small price you could buy a complete new petcock with rubber seal and filter straw

 

·
Super Moderator
Joined
·
4,289 Posts
I've been looking and I cant find the same petcock set up on ebay.
Yours is a vacuum petcock. However the vacuum function is not really needed, the petcock can be replaced with a non-vacuum petcock. If that is done the vacuum port on the carb must be blocked off.
 

·
Registered
Joined
·
1,599 Posts
18mm isnt it ?
 

·
Super Moderator
Joined
·
15,447 Posts
IIRC, the CX500 models that came with non-vacuum petcocks have 16mm threads but the GL500, CX/GL650 and later CX500 models that came with vacuum petcocks have 18mm threads. Hopefully someone who knows for sure will either confirm or correct that.

If you convert to a non-vacuum petcock you will also need to cap the barb on the left side of the right carb where the vacuum hose connects.

FWIW, I have a bunch of old petcock parts and could send you what you need but with postage rates being what they are a new one from China would probably cost you less than postage from Canada, not to mention that there is no guarantee that the one you have will work - there is a rubber "donut (actually a disc with 4 holes) in the main valve of the petcock that can deteriorate with age & use plus the vacuum part would probably need to be rebuilt (you can get a kit for that but the donut is not available.

Welcome to the forum. Please add your location to your profile and your bike's model and model year to your signature so that you don't have to remember to tell us every time and we don't have to keep asking when you forget (see Forum Settings link in my signature).

And welcome to the world of antique vehicle ownership (they own us, not the other way around). Your bike is about 4 decades old and the Previous Owners may or may not have done the maintenance necessary to keep it safe & reliable so it is highly recommended to download the Factory Shop Manual for your model (available through the CX Wiki - link in my signature) and go through all of the service procedures, regardless of whether your bike has reached the specified mileage.
I also recommend looking on all rubber parts with suspicion because rubber does not age gracefully. Check the date codes on your tires and replace them if they are over 5 years old no matter how good they look & feel because old rubber simply cannot flow around the irregularities in the asphalt well enough to grip, especially if it is cool or wet. If your bike still has the original rubber brake line(s) (should be replaced every 2 or 3 fluid changes = 5 or 6 years) I recommend shopping for modern stainless braided ones (they last practically forever and double the life of the fluid).
 

·
Registered
Joined
·
1,112 Posts
Interestingly for the std CX (different tap) just the screen is listed at $80 via Honda and the whole tap with screen for $100 or so.....

Aftermarket might b the go....

as per muzza
"For a very small price you could buy a complete new petcock with rubber seal and filter straw "
 

·
Super Moderator
Joined
·
15,447 Posts
I think they changed to the vacuum petcock about the same time they introduced the TI ignition.

I believe I paid under $15 CAD (shipping incl.) for my petcock on eBay. The only problem I have with it is that the face plate has rusted after a few winters of use on salted roads. I will either slap a bit of paint on it or if I get ambitious I might see if one from an original petcock will fit.
 
1 - 9 of 9 Posts
Top