My motor wont start for more than 5secs and it will onleystart if i mess with choke

Discussion in '2-Stroke Engines' started by hunter, Oct 30, 2007.

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  1. hunter

    hunter Guest

    I have a 70cc kings motorized bike kit

    My motor screwed up today wile i was riding it on a 2 mile ride. In the middle of the ride my motor just stopped out of no where and wouldn't start back up for more than 5secs and i onley could get it to if i messed with the choke lever . I can get it to start and run as long as i want if i pull the clutch lever wile its running and rev the engine with the throttle but as soon as i stop reving the engine it turns off. Ive made sure there nothing wrong with the clutch spark plug gas tank gasline carbscrew pipe airfilter throttle chain tires kill switch i aculey took the kill switch off btw just in case Engine still dosnt start correctly no matter how hard i try.

    Do you think buying a new carb will fix this problem?.

  2. Scottm

    Scottm Guest

    I thoght I posted a reply to this but I guess it got lost. Do a search on air and intake leaks. You may have to dig a around the garage section for a while. There's a lot of great stuff to read, you'll need the info sometime in the future. But that's my first guess since it starts with messing with the choke.
    Tighten all nuts and bolts on head, intake and exhaust. Some use O rings or hose washers between intake and carb. Check gaskets too.

    This question has been asked and answered many times over in the garage section, this may get moved there.
    Last edited by a moderator: Oct 31, 2007
  3. azbill

    azbill Active Member

    scott, you did answer before
    I moved it from bike tech and dropped all the answers telling him it was in wrong place (mine included)
    your answer must have got tossed with the rest (sorry)
  4. thatsdax

    thatsdax Guest

    You may need to Drill.....

    Check your Gas cap. If there is no little hole drilled in the side of it next to the gasket, then you have created a vacuum in your tank . And you will have to drill a little hole . Enjoy the ride...
  5. thatsdax

    thatsdax Guest

    If you have to choke it....

    If you have to choke it to keep it running, then you are fuel starved. This means you have an obstruction in the carb, or a serious air leak somewhere . Clean out your carb and check all gaskets.. Enjoy the ride..
  6. hunter

    hunter Guest

    air leak in the intake?. Where is the intake and if theres a lek in it how do i fix it?.
  7. hunter

    hunter Guest

    Would buying a new carb and a High Performance Intake Manifold from thatsdax fix my problem?.
  8. azbill

    azbill Active Member

    search intake leaks
    try to do a little for yourself instead of just asking
    (especially try to look/ask in the right place)
  9. jpilot

    jpilot Guest

    The intake is the pipe between the carb and the engine. It might just be loose. Check the studs and nuts that attach the intake to the engine and the clamp that secures the carb to the intake.

    You may just have junk in the carb. Remove the carb, disassemble it and clean it thoroughly. Use compressed air to clean out the passages. Get a can of Dust Off from Radio Shack if you don't have access to an air compressor.

    Are you running a fuel filter? If not, go to Ace hardware and get a lawnmower fuel filter and install it in the fuel line between the fuel petcock and the carb. That will cost you about 4 bucks and will likely save you lots of headaches in the future. You might also remove the fuel petcock and clean the screen. It's not unusual for these Chinese fuel tanks to have some junk in them from the factory.

    Good luck.
  10. hunter

    hunter Guest

    holly **** ki just tried to take off my intake pipe thing and the metal cracked in half... What do i do now )-:
  11. jpilot

    jpilot Guest

    I think you found your problem. Must have been a cracked weld and was leaking.

    Replace it and you should be good to go.
  12. drimpact

    drimpact Member

    Explains the way your engine wasn't running.

    Buy a new one. Get a steel one. The older and new cheap kits come with a cast aluminum piece. the good kits come with a Steel intake. has them 12.99 shipped
  13. hunter

    hunter Guest

    Im going to get a new carb and a new intake. About a month ago i rode my bike on the street about 30 miles without a airfilter and i think i may have gunked up my carb some how. however if i find out i didnt need a new carb ile just send it back to thatsdax within 30 days and get my money back.
  14. drimpact

    drimpact Member

    Running no air filter get the gunk in your engine. Riding without fuel filter get gunk in your carb.

    One post in the correct forum is the way we do things here! multiple posts, or posts in he wrong forum will be deleted. Please get with the program!!!
    Last edited: Nov 2, 2007
  15. gone_fishin

    gone_fishin Guest

    so, i to ASSUME you have no need for the duplicate topics? posting the same question repeatedly is NOT the way to win the MBc-staff's heart, i hope we see a better effort by you to help us in the future. and DO NOT post new topics about "where is my post?" you're really yanking my chain with your style 'round here...another mistake.

    btw-seeing as how you've just admitted to engine mis-use in your last post, are you really still thinking you'll be able to burn a seller for your mistake? :(
  16. hunter

    hunter Guest

    My motor still wont run nearly at all. I got a new intake manifold and gasket. I cleaned the car (It wasn't even dirty in the first place it seems). I got a new spark plug wire. Even tho i did all that The engine still dose the same thing as described in the first post. It runs fine for about 5 secs then dies or as soon as you throttle it, it dies . Ive tightened every thing on the engine with no improvement. It seems like the bike should work perfectly because nothing seems broken. It just wont run no matter what i do to. If anyone has any idea what i could do to fix this mysterious problem please help. Thanks alot
  17. hunter

    hunter Guest

    Ive just made a new discovery. If i pump the gas tickler on the carb a few times before i try to start the motor it runs fine for about 10 seconts and i can get it up to full speed but then after 10secs the engine dies because it seems to run out of gas. It seems for some reason the engine is being starved of gas i dunno y tho. If Anyone thinks they got a fix for this problem or knows some way to help me out please post ^_^.

    Thanks alot everyone.
  18. jpilot

    jpilot Guest

    Sounds like you probably have some trash in the float valve.
  19. hunter

    hunter Guest

    It just keeps getting worse.....:(

    It seems there was an airlock inside my carb and gasline that kept on coming back. I got the airlock out and the bike started up perfectly. It ran great for about 40secs then disaster hit.... The engine loudly started buzzing and then turned off. Now the engines pistons wont pump at all when i use the glutch. Its like the engine just froze up and everything inside it wont move anymore.

    Help what do i do now. Is my engine totaled? ? :confused:

    BTW drimpact my airfilter broke off some how. One minuet when i was riding it it was there the other minute it was long gone.
    Last edited by a moderator: Nov 14, 2007
  20. hunter

    hunter Guest