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2 Stroke Bicycle Engines & Kits 2 stroke engine kits need careful installation and setup, find out how from our professionals here!

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  #1  
Old 12-25-2016, 09:55 PM
kayosdad kayosdad is offline
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Default 2nd tank of gas, bike wont start

80/60cc Flying Horse - brand new bike. Complete newb. The bike was a christmas gift to my 15 yr old son.
Thefirst tank of gas was at the break-in oil/gas mix ratio. Filled tank from same gas can. Have not been able to start the bike since that 2nd fill up.

Issue seems to be fuel flow. Petcock open, fuel attached to carburetor and fuel will not flow. I remove the line from the carb and the fuel runs fine into a gas can.

Any help would be appreciated.
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Old 12-25-2016, 10:48 PM
crassius crassius is offline
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Default Re: 2nd tank of gas, bike wont start

first thing is to turn off petcock, take out drain screw on bottom of carb just above clutch cable - a bit of fuel should run out - now turn on petcock and see if fuel starts running out again

if fuel is ok, check for spark, then look for things that may have come loose - wires, carb, head bolts
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Old 12-26-2016, 09:25 AM
kayosdad kayosdad is offline
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Default Re: 2nd tank of gas, bike wont start

Thanks for the quick reply.

I drained the carb. Fuel flow returned for a moment and then stopped. Without
the engine turning over how much fuel should be in the fuel line? Should it be full? Right now its about 1/4 full

Thoughts?
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  #4  
Old 12-26-2016, 11:29 AM
crassius crassius is offline
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Default Re: 2nd tank of gas, bike wont start

fuel line often has air in it - if fuel doesn't flow out with drain open and petcock on, but flows out end of line when it is off carb, then your float is stuck, or set too high, or has debris in the float valve
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Old 12-26-2016, 01:41 PM
kayosdad kayosdad is offline
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Default Re: 2nd tank of gas, bike wont start

took the carb apart. float was not stuck, no debris in the bowl, not sure how to determine if the float is set too high or not.

Everything is tight.

also not sure how to check for spark.

Sorry for the very basic questions.
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  #6  
Old 12-26-2016, 02:51 PM
crassius crassius is offline
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Default Re: 2nd tank of gas, bike wont start

as a rule of thumb, hold carb upside down with float on the tabs - sight across top of float - you should see the main jet just peeking up a bit through the hole in the float
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Old 12-27-2016, 05:35 PM
kayosdad kayosdad is offline
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Default Re: 2nd tank of gas, bike wont start

I must be missing something because there is nothing to adjust in the bowl or with the float.

Just curious as to why it would have run fine on the first tank of gas and now I cant get it started
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Old 12-27-2016, 06:11 PM
crassius crassius is offline
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Default Re: 2nd tank of gas, bike wont start

that's OK if it looks like the right height, but if it is off a bit, you would slightly bend the two brass tabs equally to adjust it

if no brass tabs, then you don't have the standard carb & we'll need a pic
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  #9  
Old 12-28-2016, 04:03 PM
kayosdad kayosdad is offline
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Default Re: 2nd tank of gas, bike wont start

ok brass tabs just like you said. made the adjustment...still nothing.

there is spark.

clutch is working.

kill switch disconnected.



I think I am running out of steam. Any further thoughts? I really appreciate the time you have already given me.
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  #10  
Old 12-28-2016, 08:39 PM
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Tyler6357 Tyler6357 is offline
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Default Re: 2nd tank of gas, bike wont start

To check for spark: (1) remove spark plug, (2) hook up spark plug boot to the spark plug , (3) hold the spark plug threads against the head metal to create a ground, (4) crank the engine by cranking the pedals with clutch engaged (clutch handle released) (5) look for spark. You might have to do it in the shade to see the spark.

Last edited by Tyler6357; 12-28-2016 at 08:42 PM.
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