2011 yz450f pipe/filter question

Hey guys I apologize if this has been covered elsewhere but I couldn't find another thread where someone had my exact setup. I have a 2011 yz450f that is all stock other than a recently installed k&n filter and a yoshimura rc-4 slip on. I took the spark arrestor out at the track today and noticed (maybe it was just me) that the bike took a couple extra kicks to fire. Could the pipe w/o the insert and filter of leaned it out too much? I've read the stock map will compensate for quite a bit. I was going to contact Tokyo mods about tuning my ecu if necessary. Bike feels more powerful on the low end for sure and runs great. I guess I could always do a plug check but basically I wanted to make sure I'm ok for right now on a stock map. Thanks for any info this site has been an excellent resource.

 I took the spark arrestor out at the track today and noticed (maybe it was just me) that the bike took a couple extra kicks to fire. Could the pipe w/o the insert and filter of leaned it out too much?

 

No. That was a simple coincidence.

Awesome I figured as much but wanted to get input on here anyways. Thanks a lot!

I have a very similar set up, same slip on, dt-1 air filter. 2010,have the throttle body mod done though. Jay Marmot map actually seems to start mine better than stock, hot and cold. It could be worth trying. Don't know where in IL you are, but if you go to any tracks in NW indiana, feel free to shoot me a message, you could use my tuner.

Thanks Leo shot you a pm. Appreciate it guys.

Create an account or sign in to comment

You need to be a member in order to leave a comment

Create an account

Sign up for a new account in our community. It's easy!


Register a new account

Sign in

Already have an account? Sign in here.


Sign In Now