Jetting Advice for YFZ 450
#1
Jetting Advice for YFZ 450
Hello, I am new to the forum and I apologize if this exact post is on here somewhere. I know there are jetting discussions but I can't find one to my exact situation. I recently bought an 08 YFZ 450 se. I am purchasing some parts for it and would like to know exactly what I should choose for jetting. I am putting on a full aftermarket exhaust (I think Dasa)and a K&N air filter. I guess first off do I need to re-jet it and if I do, what jets should I get as far as size? I have no idea how to jet or what to do with them. Also a side question as I just bought it; when it is at idle and I punch the throttle (in neutral) it bogs down and dies. What could this be? When I am riding and racing around the throttle is fine but it just seems like when I punch it before I have the engine rev'd up at all it doesn't get air or fuel fast enough.
#2
For jetting, check with the exhaust manufacturer, but generally you need to go up one or two sizes on the main, and maybe 1 size on the pilot, coming from stock.
I would only use K&N in the dunes, every where else foam is better, jmho.
Sounds like you are experiencing the dreaded FCR bog. Common on a stock carb. Try adding throttle just a tad slower and it shouldn't bog. In real world riding I have never had an issue. There are a number of fixes, including the Boyeson powershot and its' clones.
I would only use K&N in the dunes, every where else foam is better, jmho.
Sounds like you are experiencing the dreaded FCR bog. Common on a stock carb. Try adding throttle just a tad slower and it shouldn't bog. In real world riding I have never had an issue. There are a number of fixes, including the Boyeson powershot and its' clones.
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jrooker6
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04-23-2016 07:36 PM
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