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2009 KTM 250XC-F Problem

Joined
Sep 26, 2007
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#16
Hi,

I had the extact thing happen with my street bike and it turned out to be a blow back valve and o rings in the petcock. After a while of riding the o ring and valve affected the vacuum and fuel starvation would occur. Actually some fuel would flow but not enough to satisfy the engine. Opening the chock slightly would allow more fuel directly into the cyclinders and keep it running.
Now I also had this happen to my two stroke bike as well and it turned out to be an intermittent connection in the CDI caused by heat and vibration. Very same circumstances that you describe. I checked all the fuel circuits and carb ( dealer looked at carb as well but they had no clue). Start by checking all the obvious things including replacing the caps and check timing and spark as soon as the bike falters. Then check the stator coil pickup and source if all are within spec. This will help determine if there is a problem with the CDI
 
Joined
Sep 7, 2018
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#17
I finally got in touch with the owner of the bike and asked what the dealer came up with on the bike. The dealer told him that they replaced the carb with a brand new one and also replaced the head pipe with a new one. They then jetted the carb and told him it was ready to pick it up. He picked the bike up and took it for a test ride and did the same thing. Dropped it back off at the dealer and told him it was doing the same thing. The dealer kept it a few days called for him to come pick it up and said “had to adjust the carb” He says it’s been running fine ever since.
It just seems strange to me that the dealer would have such a hard getting 2 brand new carbs to run. (The one that came with the bike and the replacement). I have to wonder if the dealer is telling the full story.
Yeah, that doesn't add up. But what would they be trying to hide?
 
Joined
Apr 10, 2019
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#18
Okay, what was the final outcome? I have one that I basically run with the choke on all the time. Thought it was jetting, but this sounds like the same issue I have. I do have a 290 kit and it will haul ass and keep pace with my son's 530, but slow for a corner or alot of whoops and stumbles and dies.
 
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Joined
Apr 11, 2019
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#20
Okay, what was the final outcome? I have one that I basically run with the choke on all the time. Thought it was jetting, but this sounds like the same issue I have. I do have a 290 kit and it will haul ass and keep pace with my son's 530, but slow for a corner or alot of whoops and stumbles and dies.
Have you checked your float bowl level? Could be too high.
 
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