Vacuum-Less Petcock

ninjunk · January 13th, 2015, 04:17 PM

Does anyone know or have any good leads of a non-vacuum (always on) petcock that fits the ninja?

Some bikes can use ATV petcocks that don't have the vac thing. I'm probably going to have to buy a new petcock anyhow, i'd like to get rid of that feature as its just one more thing to clog, break, or leave me stranded on the side of the road.

alex.s · January 13th, 2015, 04:55 PM

just take out the diaphragm from your petcock. now its a no-vac petcock. remember to close up the vac hole or gas will leak out once the diaphragm is gone.

keep in mind though... with only the float valves, it is easy for the ambient fuel pressure to overcome these and flood the carb which floods the cylinder which gets a bunch of gas in your oil and ****s everything up.

ninjunk · January 13th, 2015, 05:02 PM

hmm i like where you're going with that. I'm not sure if it was supposed to be a smartass response or not... if you take the diaphragm out, duh, fuel will come out the vac side of the petcock...

but, if you take the spring out or otherwise defeat the sealing of the valve, it should work.

cool! I like it.

most of my bikes are way before people got too stupid to turn off their petcocks, so i'm not worried about that.

still if i can find a reasonably priced solution that would get rid of jankiness.. i'm all ears.

alex.s · January 13th, 2015, 05:08 PM

ahh, that might be a better plan.

MrAtom · January 13th, 2015, 08:18 PM

I cleaned out my petcock because crap was in it, and I thought "Why's this washer bent? I'll bend it back flat" and later found out it was a spring washer. I have since bent it back, but you're telling me I didn't have to go spelunking again and I could have just left it flat? Ugh.

sh123469 · January 13th, 2015, 09:13 PM

Yamaha Raptor 660 petcock fits. Part # 5LP-24500-01-00. It's usually $25 to $30.

ninjunk · January 14th, 2015, 08:51 AM

^

exactly what i was hoping someone would reply. thanks!!

ninjunk · January 14th, 2015, 08:56 AM

$19 bucks on partzilla FYI.

hopefully it shows up in the next month or two, ha!

ninjunk · January 14th, 2015, 12:31 PM

HAYOOOO

$7 shipped! I'll let everyone know how it works when i get it.

http://www.ebay.com/itm/2005-2004-20...c4dd3c&vxp=mtr

sh123469 · January 14th, 2015, 06:38 PM

Be sure it's a real Yamaha not a chinese knock-off. The knockoffs don't last very long, tend to leak, and usually the outlet is 1/4 instead of 5/16.

ninjunk · January 23rd, 2015, 09:29 AM

Got the petcock in last night and it looks really nice.

I ordered from the link posted 'zoom zoom parts'

it is pretty stiff to turn but that is pretty typical until they get some fuel in there to lube the rubber gasket.

The casting quality, fit and finish are all top notch. At that price i'm sure its china knockoff, but its a very good one. It looks like these fit a lot of sportbikes, i might just buy an extra one for the next project that comes along.

ninjunk · January 23rd, 2015, 09:33 AM

also, it does in fact appear to be 1/4" instead of 5/16"

or rather, its 7 mm instead of 8 mm.

I use a urethane clear fuel line that is 7 mm and it stretches over the 8 mm barb with a little bit of heat so it wont be a problem. For people who have a problem with this, just buy the fuel filter that has a 1/4 and 5/16 stepped barb, hook the 1/4 barb to the petcock and the 5/16 barb to the carb.

FvnnyL3tt3r1ng · January 23rd, 2015, 10:01 AM

No leaks? No problems? Test rides fine? Just spend a lot more than 7 bucks for a new petcock, wish I found this sooner! Argghh

ninjunk · January 23rd, 2015, 10:36 AM

don't have it on the bike yet, so yeah i probably shouldn't have posted anything till i made sure it was working perfecto, gasket sealed up, etc.

It 'looks' nice from an initial inspection. I've seen some really crummy petcocks from china and this is a slightly-less-crummy one. Set it next to OE yamaha (which probably gets made in the same factory in china) and you wouldn't know the difference.

and obviously, no vacuum feature so if you don't shut it off manually, it could flood your bike and garage with gas.

whitestroke · August 24th, 2023, 11:30 AM

Bought a cheap Chinese petcock seems to work alright, but it wasn't long enough to clear the bottom of the tank. I had to install it backwards. If I run out of gas I'll need to get off bike and reach under tank to access reserve. Reminder to myself don't run out of gas.

January 13th, 2015, 04:17 PM	#1
ninjunk Lostcause enthusiast Name: Graham Location: Austin, TX Join Date: Jan 2015 Motorcycle(s): 2000 EX250F Posts: 178	Vacuum-Less Petcock Does anyone know or have any good leads of a non-vacuum (always on) petcock that fits the ninja? Some bikes can use ATV petcocks that don't have the vac thing. I'm probably going to have to buy a new petcock anyhow, i'd like to get rid of that feature as its just one more thing to clog, break, or leave me stranded on the side of the road.

January 13th, 2015, 04:55 PM	#2
alex.s wat Name: wat Location: tustin/long beach Join Date: Sep 2009 Motorcycle(s): wat Posts: Too much. Blog Entries: 5 MOTM - Oct '12, Feb '14	just take out the diaphragm from your petcock. now its a no-vac petcock. remember to close up the vac hole or gas will leak out once the diaphragm is gone. keep in mind though... with only the float valves, it is easy for the ambient fuel pressure to overcome these and flood the carb which floods the cylinder which gets a bunch of gas in your oil and ****s everything up. __________________________________________________

January 13th, 2015, 05:08 PM	#4
alex.s wat Name: wat Location: tustin/long beach Join Date: Sep 2009 Motorcycle(s): wat Posts: Too much. Blog Entries: 5 MOTM - Oct '12, Feb '14	ahh, that might be a better plan. __________________________________________________

January 23rd, 2015, 10:01 AM	#13
FvnnyL3tt3r1ng ninjette.org certified postwhore Name: Justin Location: Florida Join Date: Aug 2012 Motorcycle(s): Ninja 250 2001 Posts: A lot.	No leaks? No problems? Test rides fine? Just spend a lot more than 7 bucks for a new petcock, wish I found this sooner! Argghh __________________________________________________ Mods: Offset clutch pressure plate

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January 13th, 2015, 05:02 PM	#3
ninjunk Lostcause enthusiast Name: Graham Location: Austin, TX Join Date: Jan 2015 Motorcycle(s): 2000 EX250F Posts: 178	hmm i like where you're going with that. I'm not sure if it was supposed to be a smartass response or not... if you take the diaphragm out, duh, fuel will come out the vac side of the petcock... but, if you take the spring out or otherwise defeat the sealing of the valve, it should work. cool! I like it. most of my bikes are way before people got too stupid to turn off their petcocks, so i'm not worried about that. still if i can find a reasonably priced solution that would get rid of jankiness.. i'm all ears.

January 13th, 2015, 08:18 PM	#5
MrAtom . Name: . Location: . Join Date: Aug 2014 Motorcycle(s): . Posts: A lot. MOTM - July '15	I cleaned out my petcock because crap was in it, and I thought "Why's this washer bent? I'll bend it back flat" and later found out it was a spring washer. I have since bent it back, but you're telling me I didn't have to go spelunking again and I could have just left it flat? Ugh.

January 13th, 2015, 09:13 PM	#6
sh123469 ninjette.org member Name: Steve Location: Spartanburg, SC Join Date: Nov 2014 Motorcycle(s): EX250, Suzuki Savage, 76 Goldwing restoration project, 71 CB350, 73 Yamaha GT1, Posts: 73	Yamaha Raptor 660 petcock fits. Part # 5LP-24500-01-00. It's usually $25 to $30.

January 14th, 2015, 08:51 AM	#7
ninjunk Lostcause enthusiast Name: Graham Location: Austin, TX Join Date: Jan 2015 Motorcycle(s): 2000 EX250F Posts: 178	^ exactly what i was hoping someone would reply. thanks!!

January 14th, 2015, 08:56 AM	#8
ninjunk Lostcause enthusiast Name: Graham Location: Austin, TX Join Date: Jan 2015 Motorcycle(s): 2000 EX250F Posts: 178	$19 bucks on partzilla FYI. hopefully it shows up in the next month or two, ha!

January 14th, 2015, 12:31 PM	#9
ninjunk Lostcause enthusiast Name: Graham Location: Austin, TX Join Date: Jan 2015 Motorcycle(s): 2000 EX250F Posts: 178	HAYOOOO $7 shipped! I'll let everyone know how it works when i get it. http://www.ebay.com/itm/2005-2004-20...c4dd3c&vxp=mtr

January 14th, 2015, 06:38 PM	#10
sh123469 ninjette.org member Name: Steve Location: Spartanburg, SC Join Date: Nov 2014 Motorcycle(s): EX250, Suzuki Savage, 76 Goldwing restoration project, 71 CB350, 73 Yamaha GT1, Posts: 73	Be sure it's a real Yamaha not a chinese knock-off. The knockoffs don't last very long, tend to leak, and usually the outlet is 1/4 instead of 5/16.

January 23rd, 2015, 09:29 AM	#11
ninjunk Lostcause enthusiast Name: Graham Location: Austin, TX Join Date: Jan 2015 Motorcycle(s): 2000 EX250F Posts: 178	Got the petcock in last night and it looks really nice. I ordered from the link posted 'zoom zoom parts' it is pretty stiff to turn but that is pretty typical until they get some fuel in there to lube the rubber gasket. The casting quality, fit and finish are all top notch. At that price i'm sure its china knockoff, but its a very good one. It looks like these fit a lot of sportbikes, i might just buy an extra one for the next project that comes along.

January 23rd, 2015, 09:33 AM	#12
ninjunk Lostcause enthusiast Name: Graham Location: Austin, TX Join Date: Jan 2015 Motorcycle(s): 2000 EX250F Posts: 178	also, it does in fact appear to be 1/4" instead of 5/16" or rather, its 7 mm instead of 8 mm. I use a urethane clear fuel line that is 7 mm and it stretches over the 8 mm barb with a little bit of heat so it wont be a problem. For people who have a problem with this, just buy the fuel filter that has a 1/4 and 5/16 stepped barb, hook the 1/4 barb to the petcock and the 5/16 barb to the carb.

January 23rd, 2015, 10:36 AM	#14
ninjunk Lostcause enthusiast Name: Graham Location: Austin, TX Join Date: Jan 2015 Motorcycle(s): 2000 EX250F Posts: 178	don't have it on the bike yet, so yeah i probably shouldn't have posted anything till i made sure it was working perfecto, gasket sealed up, etc. It 'looks' nice from an initial inspection. I've seen some really crummy petcocks from china and this is a slightly-less-crummy one. Set it next to OE yamaha (which probably gets made in the same factory in china) and you wouldn't know the difference. and obviously, no vacuum feature so if you don't shut it off manually, it could flood your bike and garage with gas.

August 24th, 2023, 11:30 AM	#15
whitestroke ninjette.org newbie Name: whitestroke Location: San Pedro Join Date: Aug 2023 Motorcycle(s): 2003 ninja 250 8.8Kmiles Posts: 5	Bought a cheap Chinese petcock seems to work alright, but it wasn't long enough to clear the bottom of the tank. I had to install it backwards. If I run out of gas I'll need to get off bike and reach under tank to access reserve. Reminder to myself don't run out of gas.