Engine wants to die

[scoot]

Hi ! I have read through quite a lot of threads to find the cure to my problem but i can't find the answer anywhere...Heres my prob...Engine starts good in the morning and of i go no probs for about 30min. when at a set of lights i go to pull away and when i twist the throttle the engine goes to die..if i twist it slowly the engine revs up fine ,very strange any answers welcome. baotian bt50qt-9 De-restricted thanks to the guide

[biglee]

scoot might be overheating mine has done this before.

[tls2571]

Sounds like an air/fuel mixture problem. With the scoot already warmed up and running put it on the center stand. Take a screwdriver and turn your air/fuel mixture screw(on carburetor) clockwise until the rpm's then stop, now turn screw counter-clockwise(making note of how many turns), the rpm's should rise then go back down again. Split the # of counterclockwise turns in half and screw it back in(clockwise) that many times. Also check your spark plug for burn patterns, and your air filter sponge.

Troy

[chaixi]

mine have this problem for a long time and I still can't find the problem.
I have readjust the idle speed and mixture screw, I cleaned the sponge yesterday still no luck,
I changed the needle and the rubber thingy. to keep me on the road, what I did is keep it at a speed that don't let it cut out when stops, but that is very bad for clutch, my frist clutch just gone. I am still waiting someone could help me out! please everyone help us!

[scoot]

Thanks for the quick replay dudes. I will check the plug and the mixture screw this weekend.(weather permiting)... Just seems strange Turn the throttle slowly no probs- turn it quick goes to stall I will post my findings.

[hypojam]

Accelerator pump may be flooding the engine when you twist the throttle to fast

[scoot]

it will not stall on its own only when i twist the throttle quick so for now i pull away slowly

[scoot]

I will put the clip on the carb needle back the the top to see if that makes any diff because it was fine untill i De-restricted it

[scoot]

hypojam said:

Accelerator pump may be flooding the engine when you twist the throttle to fast

any ideas if this is the case

[scoot]

Hi could someone post a link for the ( air/fuel mixture ) guide. I have looked but cant find
BT50QT-9......Thanks....

[scoot]

scoot said:

Hi ! I have read through quite a lot of threads to find the cure to my problem but i can't find the answer anywhere...Heres my prob...Engine starts good in the morning and of i go no probs for about 30min. when at a set of lights i go to pull away and when i twist the throttle the engine goes to die..if i twist it slowly the engine revs up fine ,very strange any answers welcome. baotian bt50qt-9 De-restricted thanks to the guide

Well i have finaly got round to have a look at the bike and i have found a possible cure but i have not got a clue what it does but it has stopped the bike from dying when hot. i will try to explain ,on the carb were the throttle is there is a bar connected to it and it goes down when you give it throttle, all i have done is to hold it down with a cable clip and it has stopped the bike dying and missing. The bike has got more acceleration to I will take a picture of what i did and post it a,s,a,p

[blubayou]

Scoot,

Interesting thread, I too have suffered from flat spots as you have described & despite various bending of the accelerator pump lever I still have a flat spot if Im rough with the throttle.

Interestingly I tied the lever back out of the way, so disabling the accelerator pump and found good performance, just one minor flat spot at 3/4 throttle. Can't help but think the accelerator pump is the key here, but still not right, working on it occasionally when it gets iritating.

Inherently bad carb design I believe.

[ian.]

>:(Hi
Had the same problem with mine. Dismantled the carburetter and cleaned including all jets, a little bit of dirt nothing serious. Put it back together had difficulty starting. Changed original spark plug for gkn work a treat. Did for me. Suggest try change plug first.