Question about 2005 KTM 50 SX Pro Junior LC
My sons bike bogs down and seems like he has no low end power. just wondering if the jets might be my problem.
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Posted on Jan 02, 2017
SOURCE: Jetting size 06 sx250f
jetting is not an exact procedure. too many variable altitude, temperature, humidity, gaz.. does your bike presently run rich or lean ..ect..
i would go 1 size to start. it's safe to run an engine too rich but is risky to run too lean
Posted on Jul 22, 2009
Your lower rpms are controled by the mixture screw, pilot jet, accelerator pump and the slide needle. So your problem is probably in one of these-though racing 4 strokes are known to have a little stumble at the bottom, but not what you're describing. I'll have to assume the shop has the pilot jet clean and the mixture screw adjusted properly.(roughly 1.5 turns out)
First, check your accelerator pump. Remove the carb enough to be able to look inside the throat, but leave the cables hooked up. Work the throttle a few times and make sure that there is a small squirt of fuel in the throat of the carb each time you twist the throttle. If not, your accelerator pump is clogged or damaged.
If everything is fine there, the next likely problem is the needle adjustment. It's mounted in the slide. Once you remove the needle, you'll see a small clip around it. Try moving this clip up one notch. This will lower the needle and slightly delay the fuel feed from the main. If this fuel comes in too soon, it will cause a way rich condition and cause a bog off idle.
Outside of carb issues, valve adjustment(too tight) can make for a rough idle and hard starting.
Posted on Jun 11, 2010
SOURCE: i have a 2010 ktm
Thank you for contacting FixYa with your inquiry.
Low power or stalling at start is usually air/fuel related. You have taken care of most of the things that effect the bottom end power band. Some other things you might consider:
Drill down from this link for part numbers: http://cyclehuttktm.com/FicheFinderNew/FicheFinder.aspx 2010 > 65 SX > ENGINE > CARBURETOR
Let us know if we can provide further information.
Posted on Jul 19, 2011
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