intermitent exup fault,any ideas?

[AyJay]

Chortle!


Have to say since I just fixed my EXUP, it has made a significant difference from tickover up. Without an EXUP working properly it's like riding a more modern bike with stuck on the 'Rain' map. Very fluffy and unresponsive at low revs


I might be wrong here, but I think that there's two issues. First, you've got the valve not opening properly,  but also, the ignition map is altered if it's stuck.


If you've only ridden with the EXUP stuck, then getting rid of it altogether is an improvement because the ignition is not fully advanced unless the EXUP works. But an Ivanised Fazer with a fully functioning EXUP gives a Fazer the best torque curve possible and does smooth and enhance low rev power. I'm not talking ultimate bhp here but low rev performance, and there are dyno graphs to prove it


http://www.ivansperformanceproducts.com/fz1dyno.htm


or more obviously


http://www.holeshot.com/dynocharts/dyno_fz1_header.html


The full systems, Akra, Holeshot and Yoshi, do not perform as well as the stock headers. I know it's not much of a difference and binning the system doesn't lose that much, but it's a difference you can feel.


I totally understand if you want to bin from the hassle factor alone though.