Jet recommendation for 400X with K&N / HMF Exhaust

[jbuddenberg]

Just upgraded my 2009 400X with K&N Air Filter, Powerlid, and HMF slip on exhaust. I rejetted Main Jet to 170 and Pilot to 42. After warming it up for 10 minutes I give it full throttle (still on jack stands) and it boggs out. Did I get too aggressive on the 170 Main Jet? I'm going to get the wheels on it and give it a go but wanted to get some feedback on the jetting.

Thanks!

Jimmy

PS. The exhaust does sound BEAST. Can't wait to run it.

[Stickman400]

Is the bog on bottom or top? Like right as you hit the throttle it bogs or after you get over half throttle?

[DragonGunner]

You couldn't pay me enough money to rev my machine on jack stands, don;t think thats going to be good on the engine. Take it out and run it on the ground, 170 should not be too big, may have to mess with the air mixture screw.