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Old 09-08-2010, 07:57 PM
Dougan Dougan is offline
Motorized Bicycle Senior Member
Join Date: Apr 2010
Location: wisconsin
Posts: 78
Default Re: carb adjustment?

Okay, I'm out of ideas. I've changed back to my previous spark plug, adjusted the carb needle to every level, and even switched my oil mix back in case that was messing with my fuel:air mixture. Nothing has even had a noticeable effect. Even switching the carb needle from top to bottom does not havea noticeable effect. The only thing that I do that has an effect is when I take the air filter off completely, it gets noticeably better, but not completely fixed.

Sometimes at WOT it will go for seconds without ever firing once. It's like the killswitch is being pressed. But I doubt CDI part of the engine has any blame since the removal of the air filter helps.

Does anybody else have any ideas? I'm stumped here.
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Old 09-09-2010, 12:28 AM
GearNut's Avatar
GearNut GearNut is offline
Motorized Bicycle Elite Member
Join Date: Aug 2009
Location: San Diego, Kaliforgnia
Posts: 5,106
Default Re: carb adjustment?

What is the float height adjusted to?
If it is too low it will cause what you are describing.
"It's a chinagirl. It's a sometimes fun little engine that often will break your heart. It's disposable.

Does not come with a fortune cookie."
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Old 09-09-2010, 01:15 AM
Upper Class White Trash's Avatar
Upper Class White Trash Upper Class White Trash is offline
Motorized Bicycle Member
Join Date: Aug 2010
Location: Michigan
Posts: 42
Default Re: carb adjustment?

well only guess i can give is if you haven't replaced the cap for your plug it may be to blame.

mine at high revs seemed to be starving for fuel but all checked out there.
the clip in the cap broke and the cap was dancing around on top of the plug.
fixed it and starving feel went away.

it may be feeling dead for a few cycles because plug and cap loose contact.

hope you figure this out!!!
my engine isn't leaking!! it is marking it's territory!!
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Old 09-09-2010, 11:03 PM
insomniacshotrods insomniacshotrods is offline
Motorized Bicycle Senior Member
Join Date: Sep 2008
Posts: 78
Default Re: carb adjustment?

I cut open my stock airfilter so i looked like a frown face, but a straight shot of air was able to come in. Are you running a light off the white wire from magneto? If using to much wattage of a light you will effect spark and in some cases will not allow motor to even start..ask me how i know up air cleaner, put on number 2 setting or 3, open up exhaust and cut off the end tube inside about 1/4 inch from end and use ngk bh5 spark plug, and get a different coil wire. They just screw in. Make sure your old ones are on tight also till you replace.
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