Malves, as a matter of comparison to my EFI, where does your power curve end.
I can rev my 300 all the way to 10 K on a long straight, but there is no point in trying to go past 8 K through the gears. The power curve falls sharply after 8000 revs. I am wondering if this is a tuning issue or if the egine design is the issue.

 

[QUOTE=Malves;489976]Put them on 2 days ago. I was a little disappointed with the FMF. That thing is so close to the airbox. What were they thinking? But the airbox is holding fine, so far.
Malves I just got a sweet deal on a used FMF QF from a forum member and fitted it now. 2 things to check, you will note the passenger footpeg has a small frame behind it. I found that this frame was pushing the Q4 closer to the airbox. Took a large shifting spanner and gently bent this footpeg frame outwards, and the Q4 followed away from airbox. I then put 2 flat washers between the Q4 inner mounting bracket and the KLX frame. This moved the pipe well away from the airbox.

Remember when fitting the Q4 to the header you need to loosen the two header nuts, fit all the hardware together, and then slowly tighten all the bolts evenly to avoid any stress points, and allow all the bits to settle into place evenly.
On my first attempt, the Q4 was touching the airbox. Now its well clear.

 

The instructions that came with the pipe said to bend that footpeg frame. I may just cut it, since I removed the pegs a couple of months after I got the bike. It also said to loosen all the bits, install the pipe and then tight everything up starting at the header all the way to the last nut holding the can. I also put a flat washer between the inner mount and frame. It´s not touching the airbox but is VERY close.
It actually started melting the plastic a lil since I was back to work and commuting with the bike (43km ride one way), so I put a thick dab of high temp silicone on the airbox, let it dry for a few hours and then reinstalled the pipe.

You mentioning the 8k rpm reminds me of Marcelino's discussion about intake and exhaust advance on this bike. He talks about it on his first post in the cam mod thread. I think mine tops at 10k, too, and power definitely goes down after 7.5-8k rpm.

BTW, isn't the Q4 longer than the Powercore?

 

I looked back at the Marcelino thread and noted on his Dyno run that the power curve dives at 8 K.
Powercore/Q4, my slip, thought we were talking about the same pipes.

 

FMF design their pipes around the US carb model S & SF bike. These bikes have a slightly different airbox, hence the very close fitting problem with the EFi bikes.

Get a set of aftermarket cams fitted if you want to see power over 8000rpm. Hotcams, Nassert Beet cams or Webcams101 will not only give a little more low/mid torque but will wake up the top end. My bike is still revving strongly & making power over 9000rpm in every gear. I can easily get to over 10,000rpm in top gear if needed when racing other bikes (bashing cbr250's lol). That equates to 160km/h..100mph with very quick acceleration).

 

Joel, 331 kit now, or hotcams first? What to do? Why does my bike cost more than my 4x4?

 

331 for sure! Hotcams are just the icing on the cake.

I only went for it with the Webcams(101 grind) because my mechanic had a free set or donor cams from an engine with hydro lock damage. No core charge made them fairly reasonable in price.

 

Didn`t know that. Will the US airbox fit our bikes?

 

Not sure Malves but the airbox seems to sit about 1cm lower on a EFi bike than a carb bike.

It's not a big problem, I made a couple of 1.5cm extender brackets that lower the silencer about 1.5cm & the mid section pipe (which is under the airbox) about 1cm & worked well.

 

Just wanted to report back. Bike is running great now. It's more alive. Idles great, better acceleration, a little extra final. I love the Powercore sound. Gonna get the UNI filter as soon as I can.
I end up setting the switch points back to stock. Running G 2, Y 2.5, R 2.5. I may fiddle with the red light a bit this week. Maybe it still has some room for improvment.

Another subject are the tires. I am running Metzeler 110 and 140. Great tires, specially under wet conditions. Hoping they will last like the IRC do.