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Dirt Bike Discussions By Brand
Yamaha MX & Off-Road Dirt Bikes
Acc. Pump Tuning?
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[QUOTE="Matt90GT, post: 732805, member: 30871"] First off the bog will happen when whacked really fast in idle since there is no load on the bike. It is normal and even stated in the manuals. now if you have a problem riding, that is a problem! Be sure the carb is cleaned out and the plug is good in the bike before doing anything else! First off do the blue wire mod: [url]http://motoman393.thumpertalk.com/tech/bluewire.html[/url] Then do the BK Carb Mod ( i have reposted all the info on a website ) here: [url]http://m.bobbitt.home.comcast.net/yz426fm/bkmod.html[/url] After that get the ZipTy or similar fuel screw! It is a lifesaver there! Once you get all 3 things working there, the bog should go away for you while riding. if not, get a James Dean jetting kit: [url]http://shop.thumpertalk.com/SearchResults.asp?Cat=278[/url] And lastly you could install a P-38 accel pump cover. off topic here you should also have a 03 YZ exhaust cam installed in that bike and the VibeGuy (thumpertalk member) $5 plug to remove the decompression system. [/QUOTE]
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Dirt Bike Discussions By Brand
Yamaha MX & Off-Road Dirt Bikes
Acc. Pump Tuning?
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