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General Category >> Rubber Side Down! >> Raptor petcock failure
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Message started by Tocsik on 09/13/20 at 12:44:50

Title: Raptor petcock failure
Post by Tocsik on 09/13/20 at 12:44:50

Anyone have this happen?! Went for a ride, heading for the hills. Wait, why does the back of my thigh feel wet?! Look down and the bike is puking gas.

Title: Re: Raptor petcock failure
Post by justin_o_guy2 on 09/13/20 at 13:07:55

Thats a new one,, and WAY uncool..

Title: Re: Raptor petcock failure
Post by Tocsik on 09/13/20 at 13:15:03

Just made it home, but I doubt I can trust that petcock without replacing it. Weather just turned amazing and this was my first chance at a real pleasure ride all year. I know, minor annoyance in the scheme of things, but it is frustrating just given the timing of the beautiful weather.

Title: Re: Raptor petcock failure
Post by badwolf on 09/13/20 at 13:15:14

I have had that happen, twice! But it was while pulling off the fuel line, not riding.
I shoved it back in and gave it a light rap with a hammer and it worked fine,,,,, untl I pulled the fuel line again.
Never bothered while riding.

Title: Re: Raptor petcock failure
Post by Tocsik on 09/13/20 at 13:29:01

badwolf, did you replace the faulty petcock or are you still riding with it?
My roadside repair was to pull the fuel line, shove the brass fitting back in, place the plastic handle of a screwdriver on it and tap the screwdriver with a wrench. I turned around and went home rather than chance getting up in the canyons with an unknown like this.

Maybe this is another thumper vibration "feature".

Title: Re: Raptor petcock failure
Post by badwolf on 09/13/20 at 16:15:39

It is still on there. I thought about using J B weld to seal it but it has been fine if I leave the fuel line on.
Hold a big hammer behind it and tap it in with a smaller hammer. (I can't fix anything with just one hammer!)
You could drain the tank and remove the petcock and try maybe a vice to squeeze it in ???
It's brass and cast aluminum so perhaps it could be soldered?

Title: Re: Raptor petcock failure
Post by twhitus on 09/13/20 at 16:46:18

funny enough thats the reason i replaced the stock petcock.

635854445E5C370 wrote:

Anyone have this happen?! Went for a ride, heading for the hills. Wait, why does the back of my thigh feel wet?! Look down and the bike is puking gas.

Title: Re: Raptor petcock failure
Post by ckahleer on 09/13/20 at 17:17:52

It happens. Happened to me once on a Honda petcock. Not while riding, but when pulling off a hose.
I would try to JB weld it for temporary use, and order a new S40 vacuum petcock.
I'm to forgetful for manual petcocks.

Title: Re: Raptor petcock failure
Post by Dave on 09/14/20 at 03:06:18

JBWeld is not fuel proof, and will soften when it is exposed to fuel.

I have never had this happen on a Raptor Petcock - I have had it happen on a few petcocks on vintage bikes while taking off the aged and shrunken hoses. I have never had one of them come apart again after cleaning them with acetone or lacquer thinner and gently tapping them back together.

It is just a press fit from the factory.....just do as Badwolf suggests and tap it back together. Put the brass tube in the freezer if you want to shrink it a small amount.

If you can find a threadlocker of super glue that is fuel proof......then you could use some of that - but they don't do that when they build these petcocks.

Is this a "real" Yamaha petcock....or one of the Chinese copies? The real Yamaha part has a brass tube that is drawn and has a formed bulged on the hose end......the copies have a machined brass tube with a few ridges machined into the brass.

Title: Re: Raptor petcock failure
Post by Tocsik on 09/14/20 at 06:16:07

It's the real-deal Yammy brand. I was wondering how they were joined at the factory. I ordered a new one to be safe. Haven't disconnected the fuel line in a long time so not sure why this popped out with the bike in use. I don't mind $30 for peace of mind when I may be up on the Peak To Peak highway a bit the next couple of months :).