Bike only fires with choke up

[sonic883]

i have a 80cc 2 stroke. I ride it regularly. just after riding it, i went inside for a few hours and came out to start it. It only fires with the choke up, as soon as flick it down its just cranking and not firing, when i give it the throttle with the choke down it changes tone quite a bit but doesnt fire . I was first drawn to a carb problem,i checked for spark with placing it on head,and it sparked. The carb was clean, i blew through each jet,and theres nothing obstructing. I changed the spark plug, wire, and soldered connections, could it be spark ? too much resistance,e.g it fires outside, but not inside. i cant get my head around it, within a few hours it can develop a problem like this, fires quite nice with the choke up. ANY SOLUTIONS ?

 

[Member 30571]

My guess would be.. Maybe your needle valve is sticking and not letting the gas to flow freely ?

 

[sonic883]

ok, i'll check that in the morning.

 

[sonic883]

Couldn’t help myself, lol.

the jet is loose, and off centred , i took the carb apart so, I’m not sure if that’s there because I took apart the carb, or it’s been loose the whole time

 

[Chainlube]

Couldn’t help myself, lol.

the jet is loose, and off centred , i took the carb apart so, I’m not sure if that’s there because I took apart the carb, or it’s been loose the whole time

That's bad, the first time in 7 or 8 years of playing with these that I saw that. Horrible machining.
Just replace it.

 

[Karl Snarl]

Couldn’t help myself, lol.

the jet is loose, and off centred , i took the carb apart so, I’m not sure if that’s there because I took apart the carb, or it’s been loose the whole time

I believe a 3 year old may have made that. Try to get one made by a teen or older, they have better skills on the machines. Lol. Id just get a new one.

 

[Aikaru]

Couldn’t help myself, lol.

the jet is loose, and off centred , i took the carb apart so, I’m not sure if that’s there because I took apart the carb, or it’s been loose the whole time

Holy sh-
Bro I am so sorry, this is really unlucky