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Sounds lean to me. I would check these things out, make sure that the air filter is clean, put in a new plug (gapped properly), drain out the old gas in the tank and put a gallon of fresh 91 octane. Now try the bike, if it is still backfiring, I would pull the carb off and clean it thoroughly pulling the main jet, pilot jet and check what position the clip is in. I would check the owners manual for stock carb settings (if you don't have a manual get with your local KTM dealer) and adjust the carb back to stock. If you are in a higher altitude, check with your shop and see what they are running in their bikes for mj, pj and clip position.
What else can I help you with?
What is the fastest 450 ATV?
ktm 450 sx
Which ATV is better Yamaha yfz 450r ktm 450 xc or the ktm 450 sx?
The KTM sx is fast but the yfz is the best for what I do, what kind of riding do you do?
Does a 2007 KTM 450 SX take mixed gas?
The 450 SX is a single cylinder 4 stroke, so no you do not mix gas.
How tall is a ktm 450?
Seat height on the 2010 450 SX-F is 38.78 inches
How much oil does a ktm 450 sx 2003 model take?
1.35 L
What oil should you use for your 08 KTM 450 SX?
KTM recommends 1.35 L of Motorex Power Synt 4T 10W50.
What is the top speed of a 2007 ktm 50 sx?
KTM 50 tops out around 50-52 mph my 06 ktm 50 hits 55-60mph
What does ktm sx mean?
The sx is for supercross.
Where is the oil drain plug on KTM 450 SX F?
The bottom back side of the cases by the countershaft (facing the rear wheel).
Ktm sx 360?
The KTM 360 SX is still a good bike, like all other KTM's dependable but parts are expensive when you need them. Here is a link that has pictures of the 360 SX: http://www.bikepics.com/ktm/360sx/
How much fork oil does a 06 ktm 65 sx hold?
240 ML of 5w fork oil.
What is the Oil capacity for 2006 KTM 65?
The 06 65 SX takes .3L (or 10.147 ounces). KTM recommends Motorex Top Speed 4T 15W50.
