I am considering a K&N filter and Jet Kit for my 97 XX. I currently have stock carbs and adjustments, filter and Staintune slip-ons.

Does anyone have experience with these products? I hope to elliminate the flat spot and gain power. Steve

It really wakes the bike up, but be prepared for a significant mileage reduction. Mine went from a best of 42 to around 32. May be due to the way I rode after the kit install. Dunno if it increased peak numbers, but it did reduce/eliminate the dreaded flat spot, and slid the torque curve to the left.

and no... I haven't installed a K&N kit, but have done several Factory kits and am VERY happy with them. Santiago and Tim are two other people I have installed them for, and they are equally happy with them. Fairly easy to install and OH, so worth it!!
Alan

Yes indeed, Alan is the jet kit king. Really woke my bike up. Might as well drop a tooth on the front sprocket while you are at it. :lol:

I've got a '97 with the K&N Jet kit and filter. Gained 14 horses on the Dyno, filled-in the midrange flat spot, but lost 10 mpg. What the hell, still better mpg than what my car gets :) at 16mpg.

Ditto, I have a K&N (you don't gain much flow but you don't have to replace it, just clean it every 50k miles) and Factory jet kit. With my MIGS, I found the European Jetting with then new needles/setting perfect for taking out the flat spots.

MaXX

What's that?

On the recommendation of a previously posted, happy tuner, I am now thinking of the K&N filter, pilot screws set at 2.5 turns out, and raising the stock needles 1mm with two #4 brass washers. I searched all of your jetting posts, great stuff. I want to get rid of the flat spot from a drivability standpoint, not so much an expected performance increase. When I whack the throttle open, I want it to just go, without stumbling before it gets happy and starts to rev freely. Should I give this plan a try?

If I am not keen on the result of these tuning changes, I think the Factory kit would be next.

We expect to see 40 this weekend in southern WI, so I hope to do some riding, after that, its into the basement and let the wrenching begin. Steve

If you own a Repair Manual, the 97-98 bird came with different Jetting for UK Models and US Models. The UK being Richer. Here are the Jetting settings. I bumped the Pilot Jet up 1 size to a 43 or 45 which took care of my hesitation between 1500 and 3000 RPMS too. It is an Option in the Factory Jet kit, but they do not provide the Pilots.

US is:
Carbs 1 and 4 = 140
Carbs 2 and 3 = 142

UK is
Carbs 1 and 4 = 142
Carbs 2 and 3 = 145

MaXX

did you order those from oem maxx? Was it less expensive to do it that way than say k&n or factory pro?

No, OEM are expensive (like $13 a jet). I ended up going to a local Performance Shop (Schmallenberg Racing) and he stocks all Keihin Jets. I think it ran me $20 for the four pilots (I used the Factory Pro Kit for the Mains and Needles).

maXX

I went from 42.5 pilots to 45, raised the stock needle 1mm, opened the slide hole (insert joke, no pun intended) 7/64, and borrowed a pilot screw adjustment tool. I have stock US mains for now.

MAXX after you increased your pilot size, do you remember how many turns open you set you pilot screw? I am concerned that with 45s, 2.5 turns out may be too much. Thanks Steve