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XR 400 Coughing dying until warmed up

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Hi all.

Hoping someone can give me some advice, read heaps of threads but must still be missing my answer.

Got an 03 XR400 that is missing/hesitating and dying when cold. When its warm it runs a treat.

Really need some advice as I am peed with it the way it is. Could it be valves?

Regards

Glenn:excuseme:

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Hi all.

Hoping someone can give me some advice, read heaps of threads but must still be missing my answer.

Got an 03 XR400 that is missing/hesitating and dying when cold. When its warm it runs a treat.

Really need some advice as I am peed with it the way it is. Could it be valves?

Regards

Glenn:excuseme:

Probably need more info. Is it stock, stock jetting, pipe, etc. A stock bike does act this way till it's warm cause it's so lean from the start. If the bike is already Gordoned, than you probably have a fuel adustment to make, but that's just my guess.

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More info

Been modded as per G and was running well, probably done 700miles on it since mods. Then new plug and a valve clearances adjustment , now about 700 miles since then

Any reply welcomed

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what jets are in it? what altitude? did you just fill up with new petrol *possibley bad?* choke plate? I think they had a choke plate flap that goes bad or comes loose.

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Sounds like the choke circuit is not working. A good cleaning of the carb is in order. Maybe the choke flapper does not rotate? You might be abe to richlen the fuel screw a little to compensate? Somewhere around 2.5-3 turns out.

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So are you saying that this is a new condition and that the bike did not run this way before? Have any changes/adjustments been made just prior to this condition beginning? If so what was done? We need some basic information to diagnose. Just know, whatever it is can be corrected.

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Just a reply for your comments. I cleaned the carb out and checks the valve clearances for luck nad :):smirk: you beauty she's all sweet again. So again thanks for your help, much appreciated

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