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ReedRulz

2007 Yz450f

6 posts in this topic

Does any one have a 2007 YZ450F with FMF megabomb and 4.1 exhaust that can give me there jetting specs. I have a 2007 YZ450F with megabomb, factory 4.1 and twin air filter at sea level

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I have that exact set up. Save yourself a ton of time by purchasing a JD jet kit. Since I switched to his needle, mine starts first kick almost every time and seldom stalls.

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I have that exact set up. Save yourself a ton of time by purchasing a JD jet kit. Since I switched to his needle, mine starts first kick almost every time and seldom stalls.

Mine starts first kick and doesnt stall either but if I blip the throttle hard from idle it will cut out is this normal? Other than that it runs great.

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I have that exact set up. Save yourself a ton of time by purchasing a JD jet kit. Since I switched to his needle, mine starts first kick almost every time and seldom stalls.

Save yourself some time and money by reading the jetting database and learning what countless others have done. There are plenty of people that have already blazed the jetting trail for you. I just read all the jetting that applied to my bike and took an "average" and it got me really close.

BTW I am at 2300 ft have a full DRD exhaust with a spark arrestor, stock air filter and run stock needle (NFLR I think), 4th clip, 165 main, 68 pilot, 55 leak (stock i believe), and 1.5 to 2.25 turns out on the fuel screw. I use Maxima FFT filter oil excusively. Bike starts easily hot and cold and runs like a scalded dog. If anything you might go to a 168 main as compared to the 165 on my bike. My bike is an 07.

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Mine starts first kick and doesnt stall either but if I blip the throttle hard from idle it will cut out is this normal? Other than that it runs great.

Yes that is normal. You can't blip the thottle on these bikes. The bike should stumble if you blip it from an idle but the bike should not quit running except in rare cases but the bike will definitely cough a bit.

Nate

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