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systo520

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9:08 AM
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Sep 22, 2010
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OK so heres what happened, i took my bike down the road about a mile, the whole way there it worked fine till aboutt 2 blocks away it sounded like i heard a loud pop. dont know where it was from, but the motor still worked the next 2 blocks. i have a 50 cc motor btw if it makes a difference. i hop on it to ride home and decide i wanna pedal home, so i pedaled most the way home, decided to release the clutch, it kicked the motor on, tried to twist the throttle but gave no response the motor choked out cuz it wasnt getting gas it seems like, now before i left i filled the bike with gas, the gas that was given to me at time of purchase (2 days ago), fuel was on, only thing i can think is it was bad gas or something, but it says it was a gas oil mix in the can so i just poured it in. is this a bad gas problem or something else? Like i said the motor kicks on but dies after a few seconds because its not getting the gas, at least thats what it seems like to me but im a total newb when it comes to these. thank you
 
Remove the gas from the tank and discard it, clean the tank thoroughly, replace the fuel filter, if it doesn't have a fuel filter get one and install it between the tank and the carb, disassemble the carb and clean it thoroughly, reassemble the carb, install the carb to the engine with an O-ring of the correct size to prevent air leaks, throw out any gas you have and buy fresh gas, mix with a quality 2 cycle oil (find the best oils to use by searching this site) in the correct ratio for your engine, remove gas line at the carb and open the petcock to make sure you have a good flow to the carb, and finally, clean or replace the spark plug. Never use old gas. Never use gas-oil premix you haven't mixed to the correct ratio yourself. Luck.
 
It sounds like a blockage in the tank, gas line, or carb. Dirt or rust in the tank/gas will cause blockage in any small orifice or tube it tries to flow through. Make it clean, then keep it clean. Old gas can be a problem with any engine, for 2 stroke gas-oil mix even more so, and these cheap Chinese engines especially.
 
hopefully that was gas with 2 stroke oil that you put in it, and not straight gas.
the pop noise could have been a backfire out of the exhaust from the engine leaning out.(too much air, and not enough gas going into the cylinder)
it could have leaned out if it ran out of gas (no gas flowing into the carberator). but if the carb. was not getting any gas from a blockage, then it should not have quit running after you heard the pop and it never should have ran at all on your second attempt to start it. you said that it restarted when you tried it the second time but you had no throttle response. if it was not getting gas the engine should have never started on the second try. IF it was straight gas that you put in it, you might have severly damaged the piston rings, (and the bearings for that matter) which would cause a loss in compression, which would cause what you described. no throttle response i.e. no power. the engine still may run, but it may run poorly and have little to no power. sometimes a 2 stroke will just lock up when you run straight gas in it, and sometimes they will continue to try and run if the bearings are not damaged too bad. but eventually, it will lock up from no lubrication. I'm not saying that this is what happened, but it's a very good possibility.
IF in fact it was straight gas that you put in it, with no 2 stroke oil, you may have major internal engine damage.
if it was straight gas with no oil, then you just ran your engine with no lubrication AT ALL...same as draining the oil out of your car engine and taking it for a drive.
 
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pops to me sound electrical in nature... usually combined with a leaky exhaust manifold...

the loss of power then sounds like erratic sparks...

the clean/replace plug advice sounded the best.

how have you got it wired?

*looks suspiciously at the white wire*


BUT!

wait for it....

main jets blocked.

take a peek inside the carb bowl...only two screws :)
 
if the main jet was blocked then no fuel would get into the engine...hence, it wouldn't have started on the second try like he said it did.
it could be electrical as others have said,,,and it could be an intermittent problem (a wire with a loose connection or a wire touching something and grounding out).
BUT...that would not explain the no throttle response that he mentioned AFTER the engine was running for the second time.
 
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semi blocked main jet?

either a flake of paint or gunk or just "shellac" deposits from lousy storage methods... fuel filters are good :)

lets enough in to start, idle, crack the throttle... then die :)


another problem im getting lately which might be it...

my float needle is actually jamming in the seat...sometimes its fine, sometimes it starts, runs for a few seconds, dies(as the bowl empties)...until i stick some wire down the brass inlet barb and free it up again....
 
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