cant rev with choke off!!! HELP!!!

[thumpstar110]

hey there guys ive put my lifan 140 in my bike run it all in fine, but now it seems that when i turn the choke off once ive started the bike and its warmed up i turn the choke off but it ides fine as soon as you give it a tiny bit of revs it cuts out.

could this be to much air?? If so is the bike ok to run with choke on all the time of if i have the choke half on??

please help guys.

regards
tom

[WPB Pitbikes]

If you bought the Lifan as an upgrade then are you using your original carb, off your old 110 bike, if so what is it.

The carbs take a bit of fine tuning to run sweetly on the 140's

Your mixture sounds too lean, thats why its bogging as soon as you lift the throttle.

[Despise]

Originally Posted by haveagoade

If you bought the Lifan as an upgrade then are you using your original carb, off your old 110 bike, if so what is it.

The carbs take a bit of fine tuning to run sweetly on the 140's

Your mixture sounds too lean, thats why its bogging as soon as you lift the throttle.

that or you are just burning fumes (aka a drop of fuel)

[Despise]

abit of help in the bottomish section http://www.pitbikeclub.co.uk/showthread.php?t=4392

[thumpstar110]

i brought the whole lot engine and carb. so im not running my old carb im running the 140 carb

[dan-mel]

clean the carb out

check for kinks in fuel pipe

sounds like lack of fuel, deffinatly NOT the mixture screw like ade said as that only affects the mixture a tiny ammount, its the jets that have the main affect on the mixture, and a carb wont come pre-jetted that badly.

[flyingfart]

sounds like an air leak...happened with my bike...check the bolts/seal on the inlet manifold
if this doesnt help..clean carb?

[WPB Pitbikes]

Originally Posted by dan-mel

clean the carb out

check for kinks in fuel pipe

sounds like lack of fuel, deffinatly NOT the mixture screw like ade said as that only affects the mixture a tiny ammount, its the jets that have the main affect on the mixture, and a carb wont come pre-jetted that badly.

Dan ok screw the mixture almost in and see how it revs and then tell me the mixture screw has no affect.#

You can stall a bike by adusting the mixture screw.

[thumpstar110]

well i have had a fiddle with the mixture screw it made a difference but not a great different, ive checked all the screws and everything tight and the carb has been cleaned out,

Is there any way to get more fuel going in to the carb???


regards
tom

[dan-mel]

Originally Posted by haveagoade

Dan ok screw the mixture almost in and see how it revs and then tell me the mixture screw has no affect.#

You can stall a bike by adusting the mixture screw.

you shure your not on about the idle

i didnt say no affect, just not much compared to the jets.

and yes it will stall if your idle is already on the limit of stalling that little difference the mixture screw makes will stall it.

But no matter how much the bugger about with the screw it wont affect it enough to make it stall once the bike is warm.