Question about 2003 Yamaha DT 125 R
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Setting up the PowerValve
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Posted on Mar 14, 2016
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Posted on Jan 02, 2017
the only way to fix the problem would be to upgrade your endcan or or carbs.it is a problem with all 650 dakers.just needs tunning up.hope this helps
Posted on Sep 25, 2009
Hi and welcome to FixYa,
Jet size would depend which carb is installed, a Dellorto 34mm?
Initially, check the sparkplug tip colors. If very light brown to almost whitish, then lean mix; too much air, too little gas. Try raising the needle if if has notches and moving the e-clip. If fixed, use small thin washers. The basic idea is to make the needle rise early on throttle movement.
If an aftermarket open breather air filter is installed, then it would be causing the lean mix, too much air. Restrict the filter by adding temporarily upholstery foam to experiment at which thickness the flatspot would disappear.
Good luck and thank you for asking FixYa. Happy Holidays.
Posted on Dec 17, 2009
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