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  #1  
Old 11-19-2011, 05:36 PM
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Default need help with 49cc mini bikes.

i have gotten 2 mini bikes from craigslist for $50.

one is a apc mini harley davidson. complete with key n all just needs a new battery. and the other is a freedom scooter stand up scooter with a seat.

both have 49'' 2 stroke motors.

i took both carbs apart and completly cleaned them, put new spark plugs in both as well as new gas/oil mix. i cleaned out the fuel tanks.

primed the carbs just a lil. and when i hook up my jumper pack/ boost pack to the electric starter on both motors, they both do the same exact thing.

when giving power to the electric starter the motor will spin and turn the back tire kinda fast so the bike wants to take off. as soon as i dissconnect the jumper pack from the starter the motor stops.

but its weird cause it dont seem like the motor is actually turning on. it seems its just spinning cause of the electric starter spinning..

im getting good spark. and defintly getting good fuel cause i flooded the motor from trying to start them so much. i left them sit for 2 days and tried again and the same thing..


does anyone have any experience with these lil 49cc motors ?


thanks.. oh and yes i even tried to pull start them and they still dont start
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  #2  
Old 11-19-2011, 06:08 PM
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might have a reed stuck open

check the compression

mixture is key to... to lean and it will do weird stuff

I have a 50cc honda spree that I am building now...
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Old 11-19-2011, 06:13 PM
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any chance u did anything to any wires etc etc or did any more motor work then u said u did?
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Old 11-19-2011, 06:22 PM
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i would check the reeds and is there a cutoff switch that is missing or anything? on my banshee,weed wacker,chainsaw, and anything 2 stroke i run a 40:1 ratio with belray mc1
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Old 11-19-2011, 08:29 PM
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Quote:
Originally Posted by 89boxchevy View Post
i would check the reeds and is there a cutoff switch that is missing or anything? on my banshee,weed wacker,chainsaw, and anything 2 stroke i run a 40:1 ratio with belray mc1
not sure what you's mean by the reed. im new to small motors n mini bikes
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Old 11-19-2011, 08:34 PM
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It sounds like those are piston port intake engines not reed intake.
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Old 11-20-2011, 07:48 PM
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i had one when i was younger and the prob was that the tail pipe was pinched shut from the pipe smashing the ground when doing wheelies. i doubt this is your issue on both of them. but it has no reason to not run if its getting fuel and spark and compression. if all checks ok in the carb then you may not have any compression. if they were used and abused then its possible that the rings are bad and fuel is leaking into your crank case. but if it hasnt seiged up then thats not your problem. check the kill switch, it could be broken and just grounding out the mag while your trying to start it. idk how much electrical is on the ones you own, but there isnt much that can go wrong. im sure that you will find and fix the problem soon
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Old 11-21-2011, 11:03 AM
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Quote:
Originally Posted by Jthomas View Post
i had one when i was younger and the prob was that the tail pipe was pinched shut from the pipe smashing the ground when doing wheelies. i doubt this is your issue on both of them. but it has no reason to not run if its getting fuel and spark and compression. if all checks ok in the carb then you may not have any compression. if they were used and abused then its possible that the rings are bad and fuel is leaking into your crank case. but if it hasnt seiged up then thats not your problem. check the kill switch, it could be broken and just grounding out the mag while your trying to start it. idk how much electrical is on the ones you own, but there isnt much that can go wrong. im sure that you will find and fix the problem soon


here is exactly what i have.. and they are not used and abused as the tires on both still have full blown nipples all over them. person i got them from said kids used them a handfull of times then they just sat.

so i cleaned carbs and did what ever else i could think of. bikes dont look like they was ever really used as to the condition of them and especially the tires. no scratches or dings on them either really..


here are the bikes i have.

this same exact bike. ( no charger and battery is shot ) PULL START WORKS.
APC Mini Choppers available at TruckAddons.com


and this scooter. but in red. ( no charger, shit battery, no pullstart ). was jump starting it to try to get it to turn on.

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and if anyone really really knows about these alot, i will take the time to show you a video of what it does when i try to start them. thanks.
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[SIGPIC] 4 15'' modded juggernauts with aluminum voice coils.. juggernauts will do 4000 rms per sub...and im swapping my 2 kicker 2500.1 amps, for a stetsom 10kd.. the rest of my system is ... 2 kicker 650.4 amps, 4 10'' evm dl10x mids. 4 8'' beyma highs. kicker kx3 3 way crossover, alpine old school digital sound field processor, over 100 feet of 0 awg flex wire and 300 amp iraggi alt, 4 deka intimidator batts...
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