Sudden power loss on motorized bike?

Discussion in 'Motorized Bicycle Trouble Shooting' started by JJ1, Mar 30, 2017.

  1. JJ1

    JJ1 New Member

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    I was heading down the road on my motorized bike. It was about the 13th mile, and all of a sudden I lost power. The bike stalled out. I checked compression and the spark plug. The bike will only run weak on full choke, and is very touchy. I need answers on this. I thought it was the fuel float in the carb so I ordered a new one.a
     
  2. BobbyT

    BobbyT Member

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    How did your plug look? Did you check for spark? are all your bolts tight? You can't get answers without giving info. Check if your head bolts came loose. Are you still running 16 to 1?
     
  3. JJ1

    JJ1 New Member

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    Plug looked a little dark, but I know there is spark. Head bolts are all tightened up. Im still running 16:1. I think the float on the carb or something in there is causing the problem.
     
  4. bairdco

    bairdco a guy who makes cool bikes

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    Air leak. Check the carb and manifold for looseness, breaks, holes, cracks, blown out gaskets.
    9 times outta ten, that's your problem.

    One outta ten is the head gasket.
     
  5. Venice Motor Bikes

    Venice Motor Bikes Custom Builder / Dealer/Los Angeles

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    Tale off the float bowl & look inside to see if the jet is down in bottom the float bowl
     
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  6. Slogger

    Slogger Member

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    Mine did this and all it was was a bit of dirt clogging the main jet.
    Clean the needle and seat while you're in there checking.
    Good luck!
     
  7. Kioshk

    Kioshk Active Member

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    ...and GET OFF 16:1!!! Why is this even a thing anymore? Are kits still shipping with that suggested break-in ratio? That's WAY too much oil. I use HALF that generally.
     
  8. Potato_In_Exhaust

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    That's the problem, too much oil mixed with gas causing a lean condition and fouling the plug with excess oil. Yes I said, 'LEAN', contrary to what people think when mixing too much oil with fuel..... think about it and figure it for yourself.
     
  9. TheNecromancer13

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    Yep, the kit I opened yesterday said 16:1, it's so stupid. I tell people to run them at 32:1 for break in and then 40:1 after the first few tanks, and none of the people I've built bikes for have had any issues.
     
  10. crassius

    crassius Well-Known Member

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    I like about 2 cups of 16:1 with 32:1 added after that.
     
  11. Potato_In_Exhaust

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    I don't think the guy will change his ways and will keep running 16:1 until his motor is covered in splooge....... even then he'll probably add another tablespoon of oil more just for good measure.
     

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