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Discussion Starter #1
ok, done laughing?

im going to setup my tank for petcock(s). i have the tanner tank. i think he gave me 2 places to mount up the petcocks. any reason why i should use 2, one on each side, or one single one with 2 outlets?

anyone got a place to buy em?

also, anyone got any 35mm fork tube clamps? proflos out.

jc
 

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Joe, I ASSOOOOme this Tannermatic tank you speak of has a "saddle" that allows the tank to conform to the backbone of the frame and thus has two separate and distinct low spots, on either side of said "saddle", from which to draw fuel....Is this an accurate and safe assumption....


FR
 

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Discussion Starter #4
i guess, i dont remember. but, im not too worried about running it out of gas. ive done that. more than once. so i always have tons of gas. ill buy the no reserve type. i think his tank is pretty flat in back.

is there any reason to use 2 petcocks, one for each carb? i cant think of any reason.

jc
 

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Typically on custom tanks I use a single outlet...in fact I usually just install a barbed fitting...then run fuel line to a valve mounted on a tab somewhere, then to a filter and splitter to feed the carbs.
Like one of these from Dennis Kirk.
JohnnyB

 

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Discussion Starter #6
thats what ive been looking for. how do ya get the barb into the tank? im trying to think and cant remember how one would mount up. can i get a barb thats threaded? hmmm....

i have the alum plate he molds in. so i was gonna drill and tap that. then thread a petcock in. then you use a t-junction of sorts?

dennis kirk, here i come.

thanks!

jc
 

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Joe...I got the same setup...aluminum plate in the back of the tank. I drilled it and tapped it for a 3/8 pipe thread...then threaded in a barbed adapter....3/8 pipe on one end...various barb sizes available for the other end. McMaster has them.

Be warned...the drilling can be tricky...3/8" pipe thread requires about a 5/8" hole. And that can get kind of nasty. I thought for sure it would rip the metal plate out of the tank...but the tannermatic tank took it just fine.

You could probably get away with smaller than 3/8 easily. Not sure why I went that large. Remember to clean the shavings out of the tank.
JohnnyB
 

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quote:
Typically on custom tanks I use a single outlet...in fact I usually just install a barbed fitting...then run fuel line to a valve mounted on a tab somewhere, then to a filter and splitter to feed the carbs.
Like one of these from Dennis Kirk.
JohnnyB


i just got the one in the middle for my 160 project off of some online m/c parts wholesaler. Like $16 plus shipping. Probably can find it for less if you look around.

Funny, all the places I looked sold the same selection in the pic above. Some little machine shop in Thailand has cornered the market on cheap aftermarket petcocks.

The middle one's for 1/4" fuel line, rated for engines less than 200cc. Wonder if it'll flow enough? My tank has a metal bung welded in but the frame's in the damn way so I'm going to run a nipple and mount the petcock inline (a la "the Branson Technique"). Easy enough to change out for a larger one I guess...JB, If you're running it inline (rather than screwed to the bottom of the tank) anyway, why not run a filter before the petcock?

Back on topic: 2 petcocks? I dunno. Maybe the tank was designed so you'd have a choice in which side to mount?

Honda go sideways!
 

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I use the middle one...have it on a couple of bikes. Pretty nice quality too.
Not sure about the whole 200cc rating...I've seen that in the catalogs but the day my 200 can use all the fuel that can run out of this thing I'll be a happy man. Hell the passages are larger than the inlets on the OEM petcock.
I've used them to drain my tanks before leaving that track, can drain out a gallon in a few minutes...that should be enough for most bikes. Maybe they meant a 200cc two stroke?
Anyway...not sure if they still come that way but the ones I've bought almost exactly like the one in the middle except they have a mount like a toggle switch...put it through a hole and tighten down a nut. The quality is surprising...the one on the left...piece of crap, I've tried them too.
JohnnyB
 

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I was thinking that for the sake of more complete drainage and usage you want both sides to drain. And to a degree, redundancy, although it's hard to imagine one side getting clogged for some reason, but if you only have one side draining, that's all it would take.
My XL600 tank just has drains on each side that I tee into a single valve like the ones pictured...so I guess it doesn't have a "petcock", just drains and a valve.


FR
 

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quote:
ok, done laughing?

im going to setup my tank for petcock(s). i have the tanner tank. i think he gave me 2 places to mount up the petcocks. any reason why i should use 2, one on each side, or one single one with 2 outlets?
anyone got a place to buy em?
also, anyone got any 35mm fork tube clamps? proflos out.
jc
Years ago, when I was running my Ducati 250, I put on a scrambler tank that only had 1 petcock. It wouldn't run at full throttle even when I left out the main jet. The single Ducati petcock just didn't flow enough.
I use delrin double sealing quick connectors that I get from McMaster Carr.
FC
 

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Frank...maybe I've never gotten the right ones but whenever I use those quick disconnects, after a couple times on and off they are a real bitch to plug in and pull part. I used to have to keep putting grease on them.
JohnnyB
 

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quote:
Frank...maybe I've never gotten the right ones but whenever I use those quick disconnects, after a couple times on and off they are a real bitch to plug in and pull part. I used to have to keep putting grease on them.
JohnnyB
JB,
You need to change to O rings to viton rings. The ones that are on them seem to swell up a bit in gas.

FC
 
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