petcock and fuel leak

Discussion in '2-Stroke Engines' started by bolton75, Feb 6, 2008.

  1. bolton75

    bolton75 Guest

    Hi guys

    The petcock on my new 70cc installation is leaking a bit of fuel. Just wondering if this is an easy fix with some teflon tape etc? It's actually leaking both with the fuel valve open and in the closed position. It leaks at a much faster rate when the fuel valve is in the open position though.

    It is a new installation so maybe I should contact Warren at Z-Box about it (Australian buyers will know who that is).

    Any ideas? I have searched for this as well within the forum. I couldn't find any possible solutions - besides a new petcock. I read Augidog's post on a brass petcock - better quality?

    Last edited by a moderator: Feb 6, 2008

  2. road_motor

    road_motor New Member

    I have the same problem. I opened mine up to start with because it was full of rust and was blocked, now it bloody leaks everywhere! I wonder where i can get a good quality one from? ie. not the Chineese one
  3. bolton75

    bolton75 Guest

    Well I've fixed my own problem.

    (1) Use teflon tape (plumbers tape) around the thread of the petcock.

    (2) Ensure the petcock is tightened to the petrol tank with a wrench.

    I put the petcock on the petrol tank 4 weeks ago when I first got the engine. I forgot that at the time I only did it up finger tight.

    Oh well. This may well help one other person from making the same mistake.

  4. Watcher05

    Watcher05 Member

    Yeah, but everytime that I tighten it up, the tap ends up on the wrong side and makes it hard to access. It must be the way the thread is; may have to place a lock nut on it some how.
  5. SirJakesus

    SirJakesus Guest

    I had this problem when I set up my kit too. I found the red gasket that came with the kit was hard and didnt seal well. I found a good sized rubber washer in the plumbing section of my hardware store, bored it out a little and screwed the petcock tight enough and in the position I liked. No leaks so far 2 years later. The teflon tape idea would work well too and shouldnt require you to screw it alllll the way in.
  6. Mine did that too but you know what?
    I got used to using it all backwards.
  7. davidsis

    davidsis Guest

    Use a round o ring they sell them at autozone the one that goes on a ford fuel injector works perfect.
  8. eltatertoto

    eltatertoto Guest

    the directions from boygofast say to put teflon tape, and i have never had a problem since day 1, so i guess teflon tape works lol harley tank petcocks look just like the chinese ones but better quality, so you might try a harley shop, or if yamahah look simmailar (never seen a yamahah up close) you might try there, when harley doesnt have it we go to yamahah cause one of my dad's bikes has an aftermarket engine, so wer'e always in and out for things harley dont have, but i have a harley petcock in my silver tank, cause the chinese 1 broke when i tried to tigten it :(
  9. I might look into that myself. Right now I zip tied the fuel line to the petcock to give it some added seal;it works actually.
    But there's always this...slight seepage coming from this valve.
    It's not leaking but there's always gas where you touch.
    I wonder if a Harley replacement would keep that gas away from my hands.
  10. cooltoy

    cooltoy Member

    I solved your problem by getting a fuel line from a John Deer dealer. Much better than the clear fish tank stuff that comes with the kit. I still use those zip ties though.
  11. eltatertoto

    eltatertoto Guest

    large, if you go to my tube, i did a vid its called my peeing tank, if you look i have the petcock shut but it still drips, thats probablly your problem, im replacing that petcock the next time im at harly, cause the one on the silver tank doesnt do that.. link is in my sig
  12. will_start

    will_start Member

    my petcock leaked too. I put electrical tape around it,
    which stopped it temporarily.

    I'll try the plumbers tape.

    On subject of leaks, has anyone perfected the fix for the petrol cap yet.
    as the ones that come from the kit are faulty in my opinion.

    I ordered a second and it leaked too.

    I've seen one other bike setup,
    and it leaked as well.

    I once taped a plastic bag onto the cap to
    transport my bike, that worked,
    buts not practical.

    I had this guy tell me that you could make it work by
    putting silicone around it's inside,
    then put the cap on the tank.

    Let it dry pull it off straight away, its up to you.

    I was thinking of trying this with plastic protecting the tank.
    take it off and let it dry, then fix.

    I haven't done this, maybe it been done here.
    I searched on the term cap, and found no references.

  13. eltatertoto

    eltatertoto Guest

    in mny opinon, those caps are just to keep other liquids out, cause it overlaps the edge, but thous caps are impossible to find, im still thinking, but i might get a motorcycle tank....
  14. Papasaun

    Papasaun Guest

    Try the search term,,,,, Gas Cap.

  15. Maybe I'll look into an auto store for some automotive grade line.
    Thanks for that tip cooltoy!

    Yea I looked at that video,eltatertoto. Maybe I'll try the teflon first then go with a valve replacement. It's really not that bad,though. I mean it's not dripping or anything.
    Last edited by a moderator: Feb 10, 2008
  16. cooltoy

    cooltoy Member

    Funny that my cap never leaks. I've felt very lucky with my kingsmotors kit as I've been going for a good six months now-every single day without any issues.
    As for the fuel line, the stuff I got is almost like a "medical grade" hose..very soft,yet thick and strong. I think it may have been for a weed-eater but like I said ,I went to a john deer dealer.
  17. Skyliner70cc

    Skyliner70cc Active Member

    I haven't ever needed to use teflon tape. The soft brass threads on the petcock valve will seal up nicely if you apply sufficient torque to the assembly...yes, with a wrench :)...what else would you use?
  18. Ant27

    Ant27 Member

    Skyliner I want to stop the leak, but wouldn't all that torque be a little rough on the tank? I think mine would crack haha.
  19. Ghost0

    Ghost0 Guest

  20. Ant27

    Ant27 Member

    Thanks I'll be sure to check that out.