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Old 07-28-2014, 08:22 PM   #1
OlyRider OP
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Joined: May 2005
Location: Pacific NorthWest
Oddometer: 1,216
2007 KTM 450XC-W Carb issues

Not a mechanic, but love this bike. it is plated here in Washington

What are the correct settings for the Keihin 39 FCR with an FMF desert pipe?

Taking it to the shop tomorrow but they won't know.

Right now...with a new plug...it backfires like a son of a gun on decel. It will die, even after it is warmed up, when I cut the throttle.


Thanks!
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Old 07-29-2014, 03:22 PM   #2
ChasM
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Joined: Nov 2007
Location: Loomis, CA (Sacramento area)
Oddometer: 175
Did you buy the bike new? What is the current jetting? The standard 'D' taper needle can easily be improved upon.

An excellent jetting combo used and recommended by many is the OCEMP needle (or the OCEMR for higher elevations) at the 4th or 5th clip from the top, 158-162 main jet, and 42 pilot jet. A good alternative is www.jdjetting.com.

To reduce popping and backfiring, remove the exhaust header pipes and coat the outside of the exhaust header pipe tips with Hi Temp Silicone Seal and reinstall. Let sit for at least 24 hours.
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Old 07-29-2014, 05:53 PM   #3
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whut he sed!....
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Old 07-29-2014, 06:33 PM   #4
OlyRider OP
Beastly Adventurer
 
Joined: May 2005
Location: Pacific NorthWest
Oddometer: 1,216
Carb fixes

What about the Zip-Ty carb mod that I read about? If you don't like it, let me know in a PM please!
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