Good evening. I am curious of what size the jets are for this kit (both mains, Pilot jet, and air pilot). Additionally, what is the length of the needle set? I am looking to use this kit to rebuild my 2010 Yamaha Big Bear YFM400FWN 4WD. I tried to rebuild with a cheaper kit previously. It idles fine however cuts out when applying the throttle as if it isn?t getting enough gas. I have also tried to adjust the air mixture xxxx on the bottom of the mikuni carb. It helped the idling smooth out however still cuts out when increasing the throttle.Just want to make sure this will correct my problems before spending the $75. Thank you for the help and your time!

Question

Good evening. I am curious of what size the jets are for this kit (both mains, Pilot jet, and air pilot). Additionally, what is the length of the needle set? I am looking to use this kit to rebuild my 2010 Yamaha Big Bear YFM400FWN 4WD. I tried to rebuild with a cheaper kit previously. It idles fine however cuts out when applying the throttle as if it isn?t getting enough gas. I have also tried to adjust the air mixture xxxx on the bottom of the mikuni carb. It helped the idling smooth out however still cuts out when increasing the throttle.Just want to make sure this will correct my problems before spending the $75. Thank you for the help and your time!

Status: Open Nov 21, 2021 - 03:47 AM

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Answer

Nov 22, 2021 - 11:22 PM

Hello Dylan,

Please use this link: https://www.dynojet.com/jet-kit-for-2007-2012-yamaha-big-bear-400-irs-yfm400--s
tage-1-q432/.
Once on the page scroll down and click on DOWNLOADS > then upload the installation guide, you will find the parts list on the right side of the first page of he guide.

And DNO490 (Fuel Needle) Length: 2.100 Inches / 53.34 mm.

Just so you know this is NOT a rebuild kit. It will NOT come with gaskets or other carb parts aside from the parts listed in the install guide.

If you need any further assistance, please contact us directly. Our technicians are available for customer assistance by phone at 800-992-4993 or email at pstech@dynojet.com M-F 8-5 PST.

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