Dasa exhaust - need jetting tips - Yamaha YFZ450 Forum : YFZ450, YFZ450R, YFZ450X Forums
 
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post #1 of 5 (permalink) Old 06-15-2011, 12:04 PM Thread Starter
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Dasa exhaust - need jetting tips

I have the Dasa Racing exhaust on my 2006 YFZ 450 and canít seem to get the tuning right. Can anyone help suggest the proper jetting?

Originally it had a 155 Main Jet and a 42 Pilot Jet. When I got the pipe someone at Dasa recommended a 175 Main Jet and 45 Pilot Jet with 2.5 turns out on the air mixture screw. I did that but it still wonít idle, it just stalls out if youíre not giving it gas. Runs great when youíre on the gas, maybe a little popping on deceleration.

Appreciate any help.
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post #2 of 5 (permalink) Old 06-15-2011, 12:23 PM
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I think you should try a 48 pilot jet if you have a stock motor with the air box lid removed.



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post #3 of 5 (permalink) Old 06-15-2011, 02:55 PM Thread Starter
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The motor is stock and I do have the airbox lid removed. Any thoughts on the air mixture screw? Should I just keep going up on the Pilot if the 48 doesn't work? How do I know when I've gone too big on the Pilot?
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post #4 of 5 (permalink) Old 06-15-2011, 03:05 PM
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I've got an 08 with a Dasa and stock motor w/ airbox removed and mine runs strong with a 162 main, 45 pilot, needle on clip 3, 2.5 turns on air/fuel screw.

2008 YFZ450 - Dasa Full System, Pro Taper Handlebars, Houser +1.5 Anti-vibe Steering Stem, GT Thunder A-Arms, HLS Elite Shocks, CCP Stabilizer, Pro Armor Front Bumper, Pro Armor Rear Grab Bar, GYTR Nerf Bars, Powermadd Handguards, TAG Glider Skidplate, Teixeira Tech Swingarm Skidplate, UPP Case Saver.

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post #5 of 5 (permalink) Old 06-15-2011, 09:05 PM
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jetting will depend on your elevation also...

2006 SE-DASA Classic Full System,FCI, Cam mod, Houser +2 stem, Flexx Bars 12* ATV Bend, Fox Floats.

Jetting Specs: 42p- 170m-3rd clip NCVQ 2.0 out, 0-500'.

2006 SE yfz450 -Son's-He Thinks

2011 Raptor 250 - Wife's - She Thinks

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