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Old 07-02-2010, 10:49 AM   #41
TomballD
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may be coldblooded, use the choke and let it run about 1 to2 minutes before taking it off choke. Sounds like your getting it though
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Old 07-02-2010, 10:57 AM   #42
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Quote:
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may be coldblooded, use the choke and let it run about 1 to2 minutes before taking it off choke. Sounds like your getting it though
but it doesnt want to kick over with the choke on...when its started if i pull the choke out even to half it kills it
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Old 07-02-2010, 11:00 AM   #43
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what if you just hold it steady on the throttle, revving it just a little bit for a minute or so, will that kill it? Maybe at 1/4 throttle, how does it run once it s warmed up. Have you checked air filter and plug? Does it have an aftermarket pipe, could be a jetting issue since carb is obviously clean
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Old 07-02-2010, 11:02 AM   #44
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Quote:
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what if you just hold it steady on the throttle, revving it just a little bit for a minute or so, will that kill it? Maybe at 1/4 throttle, how does it run once it s warmed up. Have you checked air filter and plug? Does it have an aftermarket pipe, could be a jetting issue since carb is obviously clean
if i try to hold the throttle steady it dies, i have to basically keep burping it, once its warm it even tries to die if i let it just get to lower rpms, plug is new only has about 10 minutes on it and the pipe is a jardine rt5
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Old 07-02-2010, 11:06 AM   #45
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i live close by, i can meet you and you can have a go at it and see what you think
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Old 07-02-2010, 11:14 AM   #46
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Yeah I am pretty open this weekend, it might need a bigger main jet if the stock is still in there, sometimes when you put a new pipe on it does or doesnt need to be jetted, does it sound really ticky or lots of noise from the valves? Like Jet/Joe said, it may need a valve adjustment. Maybe we can get MajicMans/Chads opinion on this, he is really good with the dirters from what I hear.
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Old 07-02-2010, 11:15 AM   #47
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yea, do you know where his shop is? pete said somewhere on 1960
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Old 07-02-2010, 11:20 AM   #48
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I think he is around Champions forest and 1960
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Old 07-02-2010, 11:23 AM   #49
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yea thats where his house is but him and pete opened a shop up out there somewhere. if it would stop rainign i was gonna hit some trials here in magnolia, i went out there yesterdaya dn it wasnt muddy, looked tacky more than anything but im sure today will be a different story
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Old 07-02-2010, 11:25 AM   #50
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today is the type of day i wish i had a 4wheeler
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Old 07-02-2010, 11:26 AM   #51
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also been thinking of selling it and getting a couple of 50's
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Old 07-02-2010, 11:28 AM   #52
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Sounds like your bike is just cold blooded. Also sounds like your carb might need a re-jetting and adjusting done.
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Old 07-02-2010, 11:33 AM   #53
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Sounds like your bike is just cold blooded. Also sounds like your carb might need a re-jetting and adjusting done.
yea im sure it needs to be jetted cause it does seem like it pops alittle more than normal when decellerating
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Old 07-03-2010, 08:22 PM   #54
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Popping on decell is generally caused by being lean. go up one size on pilot jet
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Old 07-03-2010, 09:37 PM   #55
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Yup our shop is at the end of Duncan road. Duncan is 2 light west of champions forest on 1960. If anyone needs parts or work done shoot me a pm. I'm cheap. I ride dirt, sumo, track, and street. So I can work on just about anything.
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Old 07-04-2010, 09:33 AM   #56
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ive had enough of this thing. i had it starting and all but now it jsut wont start....
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Old 07-04-2010, 09:59 AM   #57
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anyone want a 250f for cheap let me know. lol. i wanna get some more 50's
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Old 07-04-2010, 03:38 PM   #58
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this bike keeps fouling plugs every 5-10 minutes....no smoke form pipe or anything, any ideas?
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Old 07-04-2010, 04:16 PM   #59
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The 2002 yz250f has a Keihin 37mm FCR carb. Great carb by the way.
The Keihin FCR is a pumper carb. This means the that it squirts gas into the carb when you roll on the throttle. It also makes it very easy to flood the bike when starting.

There maybe 2 knobs, a black one is for cold starting the red one is for hot starting. Your carb may only have the black one.

If you are popping on decell you are lean on the pilot circuit.
the SLOW JET and SLOW AIR JET are most effective in the 0 to 1/4 range. When you want a richer mixture in this range, use a larger SLOW JET or a smaller SLOW AIR JET.
The the slow jet probably has some built up in it.

Is your fouling fluffy or glossy.

Could be that the floats are set to high or that the needle valve is leaking some.
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Last edited by BPFowler; 07-04-2010 at 04:19 PM.
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Old 07-04-2010, 06:27 PM   #60
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i told him to buy mine for 3500 but nooooo now look LOL
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