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KTM MX & Off-Road Dirt Bikes
More power into my KTM 125 SX 04
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[QUOTE="Jman271, post: 663792, member: 25310"] I have an 03 125sx w/ alot of after-market stuff on it, including a Wolf Ignition. The 04 is almost the same, but w/ some updates, so here it goes. The port timing is almost the same, they went w/ diff reed system (V-Force) and Doma spec pipe, (Doma built their stock pipe for them) for improved power rather than revise all the ports and PV system. I can give you the specs of squish, w/ updated jetting, that worked for me. This will improve power, and make your bike pull. I am waiting for my SXS head as well, as soon as I get more info on what works for me, I will post it, please do the same if you get the head before I do. Here is what I did, it is a proven ripper,,,,,, 1468H needle in the 3rd position, this is a Kawi needle, about $25, you can go to www.sudco.com and get the DDJ needle, it is $5.50, run it in the 2nd position. The DDJ in the 2nd is the same as the 1468H is in the 3rd. This is a KTM Race Team spec and mostly helps clean up the jetting in the L1 dimension 192-195 main depending on elevation and fuel 52 pilot 1.25mm of squish, KTM makes diff thickness base gaskets, you can get thinner ones for tighter squish, thicker ones for larger squish. Mine came w/ a .55mm, I went w/ the .25mm to get current set up. This help boost compression slightly. You can go w/ tighter squish, but you may have to take it off the base as I don't reccomed going w/ any thinner base gasket, they are very paper thin below .25mm 40:1 w/a 50/50 mix of VP-C12 and 94 oct, you can go w/ straight VP C-12 or MR@ for better results, but work w/ your jetting V-Force, stock for 04, you already have one, it works FMF Factory Fatty and shorty, this pipe and the Doma set up work the best, call Chip Munn from Munn Racing in Texas for your Doma, he is the man. Wolf igntion set on boost, bottom line is the Wolf rocks big time, it improved power everywhere, this thing revs and sounds like no other bike I have ever heard. It pulls like no other,,,,I matched the PV flapper to the radius of the Ex port roof, it was hanging over and mis-matched. I also cleaned up the base of the jug and matched it to the cases, it was hanging over by 2mm in the transfer duct area. This is b/c the cases are the same for the 200sx and the cases were mated for the 200 jug, so the 125 jug needs some attention. This helps the flow of gasses up from the crankcase. Also the boost port passage was hanging over and partially blocked, I fixed that as well. I chamfered and degreed all the ports to stock, slight epoxy work in trasnfers for guided gas flow. The rear transfers are staggered, so if you mess w/ them, they are supposed to be off by a few degrees. HP ratings are subject to debate b/c of too many variables, but on a good day w/ a tank full of MR2 and the mods mentioned above you are in the 36-37 HP range. I can get more power out of the bike, but it will be over the winter as it is prime riding right now here in New England, it will have to wait. The power of this mod 125 is more like a 150, I am not joking. Bone stock it was a good bike w/ good power, now it is holeshot material for sure. Post back if you have any quesitons, good luck- Jman271 [/QUOTE]
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More power into my KTM 125 SX 04
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