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Dirt Bike Discussions By Brand
Yamaha MX & Off-Road Dirt Bikes
2003 YZ450F "ColdBlooded Issue"
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[QUOTE="whenfoxforks-ruled, post: 1392246, member: 73147"] There are some really small washers and o rings atop the pilot adjuster/mixture screw. Missing or cracked o rings will make it real hard to start and bog. Stock, its a small slotted adjuster out the bottom through the bowl. The after market screws make it easier to adjust. The leak/power jet looks real close in proximity to the main and pilot jet, on your carb, and a #72 is stock. When you hit the throttle, the AP circuit squirts near raw fuel in, its crucial the squirt/timing just misses the slide, or it will hesitate/bog. The leak/power jet provides the fuel for that circuit. I would check the AP diaphragm also, cracked or deteriorated. Here I thought the 05~06 Honda fcr carb was expensive 5~600 dollars, what the heck is your carb made of? Unobtanium priced at near 1500 dollars! Be careful! Basically the same carb, why can't they call the parts the same thing, because its priced more? I remember the 05 and 06 really benefited from tying the AP adjuster together, when you hit the throttle wfo the squirt did not always shoot. By the adjuster it floats sometimes. I have seen some after market ones that are solid, might have been Boyseen. I did double check Eric's book on Performance, I sure thought that year had a specific issue with bogging. All he said was get a bigger header pipe, or a flywheel weight, the power hits to hard, and the crank is weak. Vintage Bob [/QUOTE]
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Dirt Bike Discussions By Brand
Yamaha MX & Off-Road Dirt Bikes
2003 YZ450F "ColdBlooded Issue"
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