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Yamaha MX & Off-Road Dirt Bikes
My 380EXC jetting/carb blubbering situation + partial solution
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[QUOTE="sbest, post: 1436254, member: 124334"] I am at the opposite end of the scale with a street driven 2000 KTM 125 EXC but I ran into similar problems when I first started running it on the street. It seems street running is much more fussy about jetting than running on dirt ever thought of being. I also have a 300 KTM and an untried 380 motor to stick in it sometime. I also have a 2003 KTM250 SX in a Yamaha Blaster frame that had the carb tilted. Trust me brother, you can make it work but it was SOOOO much better when I took the effort to level it. I have also done a lot of work with head chamber shapes and squish and agree that the 380 may need some help here. More squish area, deeper more torroidal bowl? Back to street jetting and my 125. I figured it worked perfect off-road where I mainly worried about getting the main jet right, but discovered on-road the pilot and needle are the crucial jets. Most of the time even with the 125 I am cruising on 1/4 throttle or less. Steady state driving would buck terribly when jetted to seeming perfection, had to go 1 rich on needle and pilot to eliminate the bucking. Running float bowl low creates odd lean spots especially on acceleration. Not recommended but I had to do the same when I had the tilted carb. Incidentally, I could not always buy good gas at rural locations here, so I shimmed the base gasket up 0.015" or so to run regular 83 octane fuel. The ideal fix would have been to open the chamber up a bit but this was an easy solution and worked for the 125. It softened the low rpm power very slightly. We don't have ethanol adulterated fuel yet, so I cannot comment on that. Hope there is some help in here. Steve [/QUOTE]
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Yamaha MX & Off-Road Dirt Bikes
My 380EXC jetting/carb blubbering situation + partial solution
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