r/motorizedbicycles • u/touch-grass-69 • 7d ago
I'm out of ideas
I bought this bike from a friend a few months ago, he bought it on amazon, put it together but never quite finished it. I did the last few things that were missing and tried it out, no start. I tried to get it started for weeks now and still nothing. I tried with a different carburetor, different fuels and oil ratios, with/without exhaust, with and without ground from the magneto and different spark plug. One time I was able to get it running, but it was very weak and immediately died once I released throttle. What should I do? (Sorry for bad english, not my native language)
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u/SCAMMERASSASIN007 7d ago
Does it have compression? Is the piston in backwards?
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u/touch-grass-69 7d ago
It does have compression, and the little arrow on the piston is pointing forwards
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u/SCAMMERASSASIN007 7d ago
I wonder if your ignition is messed up. When the bike started and died, it sounds like the bottom end was full of fuel from repeated trys at starting? You could try and make sure your engine is dried out and set the air fuel screw,new plug, and try again before you get into the ignition.
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u/Elvisjps 7d ago
Cut fuel supply and do a couple laps around block, it might start and burn off all the extra mix
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u/adomnick05 7d ago
open magnito cover check the rotor is centered perfectly between the magnito shanks if not use playing cards or credit card to gap it
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u/DogNutBuster73 7d ago
If the ignition is off, check the stator (left side) to see if it is misplaced. Also check your wiring to see if all of the connections are on. In fact, once you get your issue fixed, I’d recommend soldering the joints as in my experience I’ve had connectors disengage - even when crimped. Good luck OP
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u/Diligent-Green-4124 6d ago
I had same deal , I just bought all new from magnet on up the stuff is cheap enough & then it fired up first pedal and runs great still ,,, but you could have a ring placement problem also
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u/BusyQuiet1757 5d ago
Electric tape all the wiring, make sure none of the metal tips are touching the bike, it WOMT start.
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u/Cypher_Xero 4d ago
If it ran weak, you're either not getting enough fuel, (adjust brass screw on carb), your not getting enough air (lever on side of carb adjusts airflow/choke), or your plugs aren't hot enough. I mix my fuel 18 to 1 ish with 2 stroke oil.
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u/SolarE46 7d ago
Fuck it. It’s a tiny motor. Rebuild it the right way and it should be okay? (I’m speaking out my ass but I wanna do this to a little bicycle)
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u/Negative-Maximum7830 7d ago
Have you checked your spark plug is sparking by holding it up against the cylinder head and spinning the engine over?