Question about 2002 KTM LC4 640 Adventure

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Slow I bought this bike last year and I love it but I can tell the motor is holding back a lot of power. All that I have done is removed the snorkel from the air box. What else do I need to do to make this pig fly???? I noticed there is a resinator on the exaust system is it worth my time to figure out a bypass or should I just by a new pip???

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It may not run good with the snorkle taken out and no rejetting. Start with a 160 jet for sealevel. I have left my needle alone but I ride from 4-8 thousand feet. I am running a 157 main jet. Also turn the air screw out to 2+ turns. If yo don't want to buy a pipe the easiest thing is to remove the disks and dril three or four 1/2 inch holes around the existing hole in the back plate of the mufler then replace the disks. There are some more exotic ways of doing this but this accomplishes exactly the asme thing. I tried runnning without the airbox side plate to see if it would be better than just the snorkle removed and could not tell any difference other than noise. I also drilled my slide out as many have recommended for throttle response but again I could tell no difference at all. It didn't hurt but it didn't help. Use Mobil1 15/50 or synthetic motorcycle oil. I use the car oil. The clutch worries are not real with synthetic oil unless you use one that has friction modifiers. Mobil 1 15/50 does not. It will shift noticably better with synthetic oil.,,,

Posted on Nov 10, 2008

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