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Found 4 results

  1. Hey everybody, first post after years of lurking. Saturday I traded my johnboat for another bike. A very rough 2006 ttr125 with a 150 big bore kit. (no idea who made the kit). She starts first kick no matter what, idles and runs great until about 7/8 to full throttle where it proceeds to fall on its face until I let up. Bike has an "aftermarket" carb that i'm having trouble identifying. The only marking on it is an "M" cast on the side of the body. the insides look brand new but the jets dont have sizes on them. I can post pics as soon as I get off work but without knowing what size jets I have i'm not sure what kit to purchase. Starting to think a new mikuni would be the best course of action. Any Ideas or discussion would be great. Thanks a ton in advance. -Ricky
  2. let me start off by saying, that i am a long time reader, but have never posted until today. I HAVE SEARCHED EXTENSIVELY. all over. i have done multiple fixes and changes. but, here we go... I road race in a mini bike series. kx65's are ultra popular and competitive due to their cheapness, speed and weight. I have a kx65, my frineds have kx65's, everyone has kx65's! lol My kx65 however seems to have no top end power. I can run lap times close to 2 seconds faster on our endurance bike (which i dont own), and I can always really feel the top end pull on it. Both bikes are modded exactly the same. except one runs race gas, mine does not. I have ridden other peoples kx65's and their bikes also make more top end power than mine does. What its doing is it feels like the top end just flattens out and tapers off right when it should be at peak power. It doesnt bog, it doesnt stutter, it just flattens out and makes no power where there should be 2-4k rpms of more power band. MODS MADE TO BIKE -wiseco 46.5mm piston (72cc), GENUINE keihin pwk28 carb - 132-148 main tested. float level set to factory specs, 42 pilot is golden, clip set to third position, off idle is beautiful, mid is great and will power wheelie shifting from first to second. vforce 3 carbon reeds. moose intake spacer, dent free factory expansion chamber, brand new pro circuit pipe. -crank, piston, and main bearings have 10 hours on them. rings have maybe 1 hour on them, plug color with WOT plug chops in fourth are kinda ehhh, not dark, but not light, but i can never jet it to the point of it being brown on the main jet. i have as of today ordered a 130 main jet to try even leaner settings...color largely remains the same no matter what, power is flatter with richer jetting things ive done to try and recitfy this issue -new crank seals, split case and resealed it, new piston rings, performed leak down test, held pressure except for at the plugs on the leak down tester. confirmed with soapy water... jetted and jetted and jetted. confirmed timing position. 120psi of compression on brand new rings...maybe they just hadnt seated yet?, new dent free expansion chamber, new head gasket, pit free head, confirmed squish at .65mm at all four corners. squish is however tighter right at the edge due to head gasket being slightly smaller due to 72cc piston (everyone else i race with is like this too though), what else...checked coolant system, no leaks, holds water over the course of a race weekend. last year i ran a grom, it was a pig, i wanted to get results and lap times like i had on my buddies 65, so i got a used clapped out 65 and built it. so here we are...makes great bottom and mid power, falls flat on the top, doesnt bog, doesnt stutter, and my gearing is a little bit shorter than some peoples. i get plenty of drive off of other riders on the corner, but they catch, pass me on the striaghts. when trying to pass people, i suck up on them on the brakes and in turns, then they leave me on the straight. its been half a season of me not getting results and im getting heavily annoyed... am i simply running out of my powerband and its being exacerbated by slightly shorter gearing? is my clutch slipping and making it feel like it doesnt build anymore power, but the motor isnt really increasing in revs...is my stator or coil going bad? who knows. im sure its engine related... any more ideas or questions and i will immediately respond because i sit at a desk all day at work, and have pretty much unlimited internet access... long post is looooonnnnngggggggg my neighbors are beginning to get pissed at me for screaming around all the time doing plug chops...
  3. Hi Guys, New to the forum (I am one of the audio guys on a famous Harley forum - same forum name) I am at a loss at this point in time... I am pretty savvy from a mechanical perspective, did my research, etc etc. Need bike (2005 WR250F - Keihin CRF carb) running smooth for trip july 10th with bro. So the basics: - based in Las Vegas (~2500ft above sea level) - carb is CLEAN, spark plug at .6mm, clean new air filter - float set to 8-9 mm - starts up without an issue - got manual adjustable A/F needle - set to 2 -2.5 turns out (@ 2.5 seems to run a tad better) - jetting: Pilot #42, Main #175, leak jet #95! (high compared to stock according documentation) - Needle I cannot find a code on it - EDIT: needle clip in the middle on position 4. Symptoms: + stationary - starts and runs fine + upping throttle to 1/3 RPMs increase "smoothly" + full throttle: hits the RPM limiter so IMO no issue - Quick WOT > bogs (I believe that is what you call it) and dies (I can live with that, but not the next one) - I fiddled with the accelerator Pump timing at tad, keeping track of the original setting; did not seem to get rid of the WOT issue. - 1/3 - 3/4 throttle : it ?surges?... I mean RPMs go up and down in like 2-3 times per second (this is all not loaded so in the garage; When riding bike has the same behavior) when reading articles on the web and youtube's, it "points" to the main needle, right? or perhaps the leak jet is way too big...? I appreciate your help/comments/suggestions... If need be I can shoot a video...
  4. How do you guys ride your 2 strokes when you got a long flat stretch, like a road? Isit safe to stay wide open in top gear for minutes at a time?
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