Gas Gas 250 wont tick over

[Wilksiee]

just bought myself a gas gas ec 250,

it runs lovely, but...

when starting from cold it takes a fair few kicks to start it,
and after a minute of ticking over without revving
the bike will bog out(just cut out)

and will start again and even when warm it just dosn't like ticking over for some
reason.

apparently carb was cleaned a few days before i bought it
(and buying off a good mate, i believe it).
still will clean it myself soon

but any ideas? someone said it might be to do with jetting or something, but im not sure, anyone had a similar problem or any ideas what could be up with it?

thanks

 

[Neil E.]

Year of bike? ASI or ASII?
What is in it for pilot, needle, and main?
Air screw setting?

A dirty pilot jet is the most likely issue.

 

[Wilksiee]

sorry i can't be loads of help but i will try, im new to gasgas's

its a 2004 53 plate ec 250 (not sure if thats asii asi or whatever)

the pilot should be standard i dont know, the bike hasn't been messed around with ill take it apart tomorrow, give it a clean and things, ill upload some pics.

 

[savage sausage]

trial & error

just bought myself a gas gas ec 250,

it runs lovely, but...

when starting from cold it takes a fair few kicks to start it,
and after a minute of ticking over without revving
the bike will bog out(just cut out)

and will start again and even when warm it just dosn't like ticking over for some
reason.

apparently carb was cleaned a few days before i bought it
(and buying off a good mate, i believe it).
still will clean it myself soon

but any ideas? someone said it might be to do with jetting or something, but im not sure, anyone had a similar problem or any ideas what could be up with it?

thanks

Is the air filter clean ?
how old is the plug ?

wind in the air mixture screw all the way in the back it out 1 1/2 turns that way you have a baseline to work off.

check the float height as well as what neil e said check all the jets blow them all out then reassemble the carb.

start the bike as normal with the choke on but dont give it any throttle at first when the bike starts to feel as though it is going to die knock off the choke and blip the throttle 5-6 times a reasonable handful obviously you can wind the idle screw in or out accordingly to see whether it ticks over.

If the bike stalls then whip out the plug and see whether it is wet ...if it is wet the pilot jet is too rich and you will need to put a smaller pilot in it.

try this out

 

[Jakobi]

Its all to do with the jetting.

The idle circuit in particular is very finicky to get dialled in. If it idles for a minute call it good. It doesn't want to sit around idling all day.

Try turning in the black plastic screw on the LHS of the carb a bit. Its your idle screw and will raise the idle a touch more.

If the engine races up a bit before it cuts out you might be a touch lean on the pilot. I'd say more likley is that you're slightly rich and after a minute the engine loads up a bit and stalls out. Not enough to foul the plug, but enough to not be ideal idling conditions anymore.

 

[einsteingarage]

What savage said sounds good.

I would guess that if the carb needed to be cleaned before you got it, the pilot screw just didn't get cleaned enough. You should be able to hold the pilot up to the light and see through it, if not, clean it with a small piece of wire.

Then work on dialing it in.

 

[gasmonkey]

It's not worth playing with that pilot jet.For a few bucks buy a new one and a size either side from any jap dealer. Easy.

 

[savage sausage]

let us all know how you are getting on

 

[jostby]

before I jetted our bikes we would lean them over until fuel dribbled out the overflow hoses then they would start right up. After jetting correctly they start easy. See the jetting thread under "Intake/Carburetion - 2 stroke"

 

[Wilksiee]

working on it still !

will post how i get on later

 

[Kin]

Wilksiee, I encountered a similar idling problem that you have described. After doing all the carb cleaning, re-jetting, air filter/spark plug new replacement, the problem was still persisted.
One day my mate spotted the choke cable was not in a proper routing position, as a result the choke was always on due to lack of cable free play, worse in the steering full locking position.
After the choke cable was adjusted with enough free play, my 2011 EC300 ticking all day long

 

[Jakobi]

Wilksiee, I encountered a similar idling problem that you have described. After doing all the carb cleaning, re-jetting, air filter/spark plug new replacement, the problem was still persisted.
One day my mate spotted the choke cable was not in a proper routing position, as a result the choke was always on due to lack of cable free play, worse in the steering full locking position.
After the choke cable was adjusted with enough free play, my 2011 EC300 ticking all day long

Another good point. If you're still running that rubbish handlebar choke swap it out for a normal plunger type. I see no benefit to having it on the bars. Its used once for every day I start the bike. I always jagged mine on vines and such. Was a pain.