07 WR450f jet kit - Yamaha Forum : Your Yamaha Motor Products Community & Resource
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post #1 of 3 (permalink) Old 11-23-2018, 05:39 AM Thread Starter
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Location: Niagara Falls
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Question 07 WR450f jet kit

Hello all
I am new to the forum and my 2007 WR450f. My question is should i replace my stock jets? it was running well until I basically parked it for the summer & when I went to ride it a few weeks ago it ran like crap sputtering then like a scolded cat. I ordered a JD jet kit and wondered if I should also order a Yamaha GYTR WR Air Induction System Removal Kit. It seems to have a lot of redundant parts and I was wondering what you have found most beneficial? I have only had this bike since the spring of this year & the only modes to it seem to be a FMF Q4 exhaust a Twin Air Filter and an IMS larger fuel tank.
I have not installed the JD jet kit as I am still considering the Yamaha GYTR WR Air Induction System Removal Kit. Any other ideas or recommendations are welcome I ride mostly around 800-1200 Ft above sea level.

Thanks in advance
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post #2 of 3 (permalink) Old 02-08-2019, 05:40 AM
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The jets and needle in the yamaha kit are super rich, so if you go that route, plan on buying jets and a needle or a jet kit separately. I'm running a 45 pilot, a 165 main and a OBDWR needle in the 4th position with 2 turns out on the air/fuel screening good results at the same altitude. I have a stock pipe with the peashooter removed and the snorkel out of the mailbox. The yamaha kit has a 175 main and a 50 pilot in it. I don't recall which needle. The bike ran ok, but no with snap with that setup. Others seem to like the JD jet kit just fine, but I choke on the prices, since my parts cost $15. I will say that getting the carb in and out on this bike is difficult,so you want to get it right the first time!

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post #3 of 3 (permalink) Old 03-16-2019, 01:54 PM Thread Starter
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JD Jet kit installed as specified runs nice with a crisp throttle response now
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