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MX, SX & Off-Road Discussions
Dirt Bike Mods & Maintenance
dyno a big bore
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[QUOTE="steve125, post: 708575, member: 20272"] elf, try bumping up your main jet to a 175 and then re-test you needle settings. A 162 is very lean for such a big carby. If your not sure if your reeds are OK then check them. Angus, if your 125 was jetted close the 144 won't change it hardly at all. Your spec sounds real close for starters. The 340 main seems to be the magic number with the 36mm on the big bores ive tried it on. I'm not a big fan of the V-force reed valve these days, even on your bike I feel stock is better. A PC pipe with a shorty is a good pick. With a least 50/50 race gas or even better the VP U2 straight, try some timing advance, usually around 2-3mm does the trick on the Kx's. Since you don't have dyno, you will have to test your timing by feel and ear (pinging). Also using the plug reading chart that marcus has shown earlier. Here's and example from tuning a 144 yesterday. 03 YZ 144 timing advanced 2mm I was testing a new pipe and noticed some ping in 3rd gear wide open pulling hard in the sand. I also noticed this pipe was running a little flat on top. So i backed the timing down 1mm, the bike reved better on top and the ping was gone but the power felt weaker. So i split the difference to 1.5mm advance and "bingo" no ping, a better rev than with a 2mm advance and now strong power. Some comments from the other riders was the bike sounded "works". It felt like it too, when a motor "tunes in" you feel it and everyone else hears it. :cool: So far on the dyno with race gas the 144's have all made more power with some timing advance. It's up to you to tune in the right amount for your engine set-up. :thumb: [/QUOTE]
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MX, SX & Off-Road Discussions
Dirt Bike Mods & Maintenance
dyno a big bore
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