Too much fuel, not enough air.

Discussion in 'Motorized Bicycle General Discussion' started by Targan, Aug 30, 2013.

  1. maniac57

    maniac57 Old, Fat, and still faster than you

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    Anytime you break stuff, it's always a good idea to clean the bottom end extremely good before bolting new (expensive) parts on it.
    I rinse out all my new motors just in case....
    might have something to do with my excellent luck with these motors.
     
  2. Targan

    Targan New Member

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    Thanks for the advice guys! I will be sure to inspect, clean, and oil everything before I put it back on.
     
  3. mapbike

    mapbike Active Member

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    Ditto.................................
     
  4. Targan

    Targan New Member

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    Rings have been installed! No luck with fixing my issue though :/ Plug still comes out oily and black-ish even on leanest settings possible for the carb. It ran choppy for a minute, then just fine for another minute, then it boggged and died. My bike idles just fine but as soon as it gets moving it jerks violently and won't idle anymore. Choke completely kills it and my idle screw has to be screwed almost all the way in.
     
  5. 2door

    2door Moderator
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    Just curious here, but how slow are you trying to ride the bike with the clutch engaged?
    From your description it almost sounds as if you're trying to idle along. That won't work. Anything below 8 to 10 mph and the clutch should be disengaged.
    Or am I reading your last post wrong?

    Tom
     
  6. neum5464

    neum5464 New Member

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    Did you retighten the head bolts after break in? if engine is oily with low mixture it could be an engine leak causing both problems. only suggesting because you mentioned not messing with the engine. could be wrong but I think proper torque is around 12lbs for the head bolts?
     
  7. Targan

    Targan New Member

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    I'm hauling ass down the road to keep it running lol. I engage the clutch around 12-15mph
     
  8. Targan

    Targan New Member

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    I don't have the proper tools to measure head torque, but they're on there super tight.
     
  9. Targan

    Targan New Member

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    Just wanted to update and say my engine is flooding really bad. What would cause this? It just makes me mad because my bike ran fine for 2 weeks after installing the NT carb, but all this crap happened
     
  10. maniac57

    maniac57 Old, Fat, and still faster than you

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    Float needle dirty?
    If gas comes out the air cleaner, clean the needle and seat and get a inline fuel filter to prevent trash from getting into it.
    Every single kit I've built had paint chips and assorted trash in the tank, and even after cleaning, paint still chips off from around the gas cap opening for a long time.
    A fuel filter is cheap insurance.
     
  11. 2door

    2door Moderator
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    Ditto:
    If the bike ran good then the problem started the most common cause is trash in the float valve needle and seat.
    Another possibility is that the float has a crack in it and it has filled with gasoline and sunk not allowing the needle valve to close which will also cause extreme flooding. Defective floats are also a common problem.

    Tom
     
  12. Targan

    Targan New Member

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    Thanks for the info. The problem started after i installed the filter (along with the carb) so i doubt trash is the problem. When I dissasembled my carb last night I cleaned it thouroughly and the float was floating right. This whole thing is a nightmare. It's my main mode of transportation. I'm going to try bending the float tab thing to make the level of fuel lower in the float.
     
  13. Targan

    Targan New Member

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    Update: Before messing with the float i decided to buya new spark plug and read it. turns out my engine doesn't seem to be running rich. Spark plug is tan-ish with very little oil. But it is still very jerky and bogging. Idle screw is almost all the way in to keep it running. the choke completely kills the bike
     
  14. Huffydavidson

    Huffydavidson STREETRACER/MANUFACTURER

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    You do know BGF has NT carbs for like $12 on e-bay. And if your engine is not leaning to forward, you should'nt have screw with the float.
     
  15. Targan

    Targan New Member

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    My carb appears to be in perfect condition. It's pretty much brand new too :/
     
  16. mapbike

    mapbike Active Member

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    If it is a fuel issue you're having then its a carb issue plain and simple, nothing else controls fuel supply or lack of to the engine, either you have adjustment issues or you have a bad part issue such as float, needle & seat not sealing properly.

    I can really screw up the inside of a carb and it still look as though it is in excellent condition, looks can be deceiving so don't think that just because something looks good that it is, you have to understand what the problem is and how the carb can be the reason and why it will cause the problem if there is a malfunction or a defect.

    If you can afford to spend $12 bucks go to BGF or LEB on ebay or even go Thatsdax site page 2 in his parts list is a new NT for $15.99, get a new carb, stick it on and see what happens, Huffy D mentioned this and I would say at this point that would be a good idea.

    best wishes

    Map
    reddd
     
  17. Targan

    Targan New Member

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    Thanks for the advice. I'll just have to suck it up and buy a new one.
     
  18. Targan

    Targan New Member

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    WOW! It was the darn spark plug all along! I was using the wrong kind. I bought like 5 different ones when I got home and BAM I got it running like a bat out of ****! (also my bike seems WAY quieter than normal but FAST!) It wasn't the mixture, the carb, or electrical at all! My previous spark plug fouled when I used too much oil one time a month ago and I never replaced it. I thought cleaning it would work so I never blamed it. Then i bought the wrong spark plug as a replacement and again, ignored it. I was so mad I bought 5 spark plugs (lol) and tried them. dance1
     
  19. Huffydavidson

    Huffydavidson STREETRACER/MANUFACTURER

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    Put a NGK B7HS in and gap it @ .028 and you reallllllyyyyyy roll.
     
  20. Targan

    Targan New Member

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    I just bought that exact plug on amazon lol. I can't wait!!!.wee.
     

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