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Dirt Bike Mods & Maintenance
Jetting questions, HELP
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[QUOTE="skhasky, post: 311908, member: 29836"] Here's your Yamaha parts list. Don't let your dealer dick you around. This is suggested retail, so don't pay more. If your float is ok, you don't need one, but it is nice to have as a spare. I always keep an extra float lying around. Also, get Genuine Yamaha parts. I few dollars more, but the Mikuni Jets are much better quality, and there are pilot variations that can screw you up. For example, the pilot for your bike should have a larger emulsion tube and a ring at the thread/body junction. If your dealer just grabs a No45 - you could have problems if it is the old style. 4PE-14185-00-00 FLOAT $28.39 5A0-14116-E0-00 NEEDLE(6BEG9-70) $8.83 4KM-14142-45-00 JET,PILOT(#45) $5.90 4KM-14142-50-00 JET,PILOT(#50) $5.90 137-14143-66-A1 JET,MAIN #330 $7.35 137-14143-68-00 JET,MAIN #340 $7.56 137-14143-70-00 JET,MAIN #350 $7.56 3TC-14141-S8-00 NOZZLE,MAIN (S-8) $19.98 Take inventory of what you have so you don't buy double on some items. Your bike shipped with the following: 350 Main 69 Needle - clip 3 55 Pilot S-9 Nozzle 5.0 Slide If your dealer put in a 1 step lower pilot, and that's it, I'd guess your current jetting is: 350M/69-2/50P@1.5 turns/S-9/5.0 Just a hunch, but my money wagers you will end up somewhere around 340M/69-2/45P@2.0 turns/S-8/5.0 for 80 degrees at ~1,000' Skip P.S. When you get your carb apart to inventory your jets, clean the carb up with spray carb cleaner. Pay attention to the tiny orifices and the pilot. These clog and wreak havok with jetting. You don't want to be chasing two problems. Also, make sure your hoses are attached and clean. [/QUOTE]
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MX, SX & Off-Road Discussions
Dirt Bike Mods & Maintenance
Jetting questions, HELP
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