For those of you that never unscrewed a fuel petcock off tank.

[Huffa]

Here is a pretty typical Honda one. Sometimes that plastic filter tube stays stuck in the tank neck where petcock threads on and other times it comes out staying on the petcock itself.

Note also that the oring that goes at very bottom of the filter. You only snug the petcock assembly down because of that oring, no need to crank on it like crazy.

Last time I bought one of those filters they were 13 bucks, so they are not cheap!

The tube has two filters, that is how your reserve works, once gas gets below the top one gas will no longer be delivered till you switch to reserve, then it sucks it through the bottom one!

[team-red-rider]

thats off a 250es/250sx right?

[Huffa]

thats off a 250es/250sx right?

YEP! 250 SX :beer

[smyers33]

My R will only run when the petcock is on reserve. Would that mean the top filter is dirty and fuel can only get through the bottom/reserve one?

[Huffa]

My R will only run when the petcock is on reserve. Would that mean the top filter is dirty and fuel can only get through the bottom/reserve one?

Good conclusion Watson! :lol:

Either that or that brass pick up tube is clogged. My reserve filter was really gunked up, I was surprised!

I at least think that's how they work. The brass tube is just for normal then the reserve sucks through a section right on the base of petcock where filter tube sits on.

Check yours out, let me know!

[Huffa]

This would be where the reserve sucks it through, at the 1/4 moon type hole there.

[mark38090]

So when the tubes stuck inside, How do you get it out without damaging it? On my SX it's stuck and I have already damaged it some.

[team-red-rider]

it dosent come out shoot compressed air through it backwards to clear any obstructions!

[Huffa]

So when the tubes stuck inside, How do you get it out without damaging it? On my SX it's stuck and I have already damaged it some.

It's not easy! Mine was too, hence why I paid 13 bucks for a new one.

I got mine out with a needle nose pliers but that is not what ruined it, mine was just a complete mess and torn. You really could get by without one but I like the fuel being filtered as much as possible.

You could actually have it filtered 3 times before it gets to carb..........that one, the filter in petcock bowl and install a in-line one too. Some models the line between carb and petcock is not long enough to let you do so, I think on the SX a narrow type of inline will work no problem though.

Try sprayin D-40 in it to loosen it up some, might help? Maybe carb cleaner too?

[team-red-rider]

wait do u mean the plastic filter or the brass tube?

[Huffa]

it dosent come out shoot compressed air through it backwards to clear any obstructions!

Yea but then they are just floating around in the tank then and eventually will gather right back at the screen. I'd rather pull the thing out and do it right. You can flush the tank easier too with them out.

[Huffa]

wait do u mean the plastic filter or the brass tube?

Did you not look at my pictures grasshopper? :lol: They are both right there!

[team-red-rider]

no sorry huffa i thought they meant the brass tube.... sorry

[team-red-rider]

ill shut up now lol

[nd4speed]

My petcock never stops the gas flow when turned off. What's wrong there?

[Huffa]

ill shut up now lol

Naaah, it's cool, I misuderstood many of times too!

[mark38090]

My petcock never stops the gas flow when turned off. What's wrong there?

My new YTM does the same. there's a rebuild kit for the petcock that sells for about $15, I think I'm going to try that.

[edog]

I never though there would be much to talk adout a Petcock.LOL

[1985 200s]

So when the tubes stuck inside, How do you get it out without damaging it? On my SX it's stuck and I have already damaged it some.

I screwed a sheet metal screw in mine enough to catch and pulled it out and it worked good. One time deal so far but it worked out.

[smyers33]

I took mine off today and blew it out with the air compressor.... Mine doesnt have that filter thing that the SX has. All mine has is a little white plastic tube that sticks into the petcock, which goes into the gas tank. But blowing it out made it work with it not on reserve.

[SWIGIN]

then your filter fell off years ago...they all had one from the factory

except for 90s and 110s....and maybe more little trikes

[kxt250r]

My petcock never stops the gas flow when turned off. What's wrong there?


same prob?? can anyone shed some light on this???

[ATCnut]

If your petcock does not stop the flow of fuel, then the rubber parts inside the bottom are shot, The only good option is to replace it.

It is "possible" to drill out the rivits on the sides of the plates that hold the knob assembly on and try to fix the insides, but parts are not available. You have to make your own.

The other thing that is important, but not critical to the assemly is the little O-ring that is inside the plastic filter tube. It seals around the brass tube in the area between the two screened sections.

Another thing to be carefull of is a petcock that draws from the reserve input when it is in the "on" position. I had a sx like that, and did not know it.'

I was a couple of miles from home, and ran out of gas. Put it on reserve, and nothing. Used another old triker trick to make it back that day.

When the tank goes empty on reserve, there is still a little gas on the other side of the tank at the bottom. This gas cannot get over the hump in the middle. Tip the trike up on its side toward the petcock, and you can get that gas on the other side of the tank. It is not much, but I made it back home.

[kxt250r]

pulled it off for a look, the bits that I could get to were all gunked up, I couldnt manage to pull off the long filter tube, every time I pulled or twisted it felt like it would snap. Any tricks here or should I just replace the lot like im thinking?