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cbsmarty

xr650l hard start when warm

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hey guys, ive searched and searched for an answer to a problem ive been dealing with for a while. ive got an 06 xr650l, 4500 miles, daves mods with 158 main and i believe 55 idle. i also have a white bros e2 pipe and uncorked with unifilter. for the last few months ive been dealing with a problem of hard starting after driving around for a while then shutting off for about 10-15 mins. when i then try to start the bike, it just cranks and cranks. finally after a couple of mins it starts. no change with choke on or off. it smells like its got fuel maybe even flooding. only happens warm, fires right up when cold. i had a bad battery and believed it was due to that but recently got a new battery, no change. thanks in advance for your help, i really respect your opinions.

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hey guys, ive searched and searched for an answer to a problem ive been dealing with for a while. ive got an 06 xr650l, 4500 miles, daves mods with 158 main and i believe 55 idle. i also have a white bros e2 pipe and uncorked with unifilter. for the last few months ive been dealing with a problem of hard starting after driving around for a while then shutting off for about 10-15 mins. when i then try to start the bike, it just cranks and cranks. finally after a couple of mins it starts. no change with choke on or off. it smells like its got fuel maybe even flooding. only happens warm, fires right up when cold. i had a bad battery and believed it was due to that but recently got a new battery, no change. thanks in advance for your help, i really respect your opinions.

Whats your hot start method? You may want to up your idle screw a bit. Mine will start hot with just a touch of throttle. Not much. Just enough to open the slide a little. Where is your fuel screw set at?

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i usually dont touch the throttle, but when it doesnt start, moving the the throttle doesnt make a difference. are you refering to the idle mixture screw with the tab on it? that is on the bottom of the carb. it is out three and a half turns i believe. i followed daves mods when i adjusted it

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i usually dont touch the throttle, but when it doesnt start, moving the the throttle doesnt make a difference. are you refering to the idle mixture screw with the tab on it? that is on the bottom of the carb. it is out three and a half turns i believe. i followed daves mods when i adjusted it

3 1/2 turns out is a bit much. Yes that is the fuel screw. Typically on 4 strokes if the screw is in front of the slide, its a fuel screw. If the screw is behind(airbox side) the slide its an air screw. That many turns out MAY mean too small of a pilot jet. Look at this link for more info..

http://www.thumpertalk.com/forum/showthread.php?t=327405

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sorry, i think it is 2.5 turns, 3.5 sounds like too much, i will check out this link thanks. are you thinking im not getting enough fuel when warm or too much?

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sorry, i think it is 2.5 turns, 3.5 sounds like too much, i will check out this link thanks. are you thinking im not getting enough fuel when warm or too much?

I was thinking too much. Thats why I suggested trying to open the throttle just a hair to get some more air into the head.

It works well on my L this way. Only I have a FCR on it.

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If its genuinely flooded it'll start right up if you crank it with the throttle wide open.

Dave

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i do hold it wide open and still doesnt start so maybe its not flooded but starving for fuel, i dont know. i will check the mix screw next, thanks

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mmmmmmmm me thinks that the fuel screw is the problem, needs to beta 2 1/4-1/2 oput from bottom and make sure you have a 55 pilot in it. both of mine hot start - at a touch of the button - no throttle at all and pop, idle. IF the bike has sat for say 20-30 mins and it's cool out - I use the choke again and then immediatley take it off upon start.

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Well I'm thinking maybe you should check your vavle clearence things get much closer when hot .Maybe holding your vavles open .Hard starting is the first symptom of low comp.

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Before I did Dave's mods my bike did the same thing when hot. A quick twist of the throttle when cranking would get it to fire. After doing Dave's with 55/158 [2.5turns out] it fires right up hot and cold.

Does your choke system work properly? Maybe it is getting stuck open and flooding when you try to hot start.

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sorry for the delay guys, i havnt touched the bike in about a week. im gunna take a look at it tommorrow and i will check all your ideas. thanks again. :confused:

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Ditto on the valve clearance!!Also check the float needle and seat and the correct float hight too while your at it,for it being too high.

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