a/f check this little gadget out

[honda400ex2003]

http://bikemanperformance.com/koso-wideband-air-fuel-ratio-gauge.html

looks very cool! 14.6-14.8 perfect performance area. This nice back lit Wideband Air/Fuel Ratio Gauge will give you precise information on your engine. IT will ALLOW YOU TO TUNE
MORE PRECISELY if your engine run too Lean or too Rich.

Specifications:
12V DC Voltage Only
Display Range 10.0-24.0 A/F
Over Lean Setting 14.8-24.0 A/F
Over Rich Setting 14.6-10.0 A/F
Screen Update's 2 x Second
Water Proof
Instrument Weighs 3 oz's
Instrument dimensions 4.0"L x 1.75"H x 1.0"W

Includes:
Koso Instrument
Bosch Wide-Band O2 sensor
Weld Bung & Plug
Wiring Harness
Universal Mounting Bracket
Instruction Manual

looks really nice for tuning anywhere or monitoring it on a machine all the time. it is for sleds but it looks like it would work for 4 strokes since you have to get a 2 stroke adaptor fitting for it. it is a bit pricey though at 340 lol steve

[CJM]

$ and needs an 02 wired in but it wouldbe worth it for those really wanting a perfect tune.

good find!

[honda400ex2003]

this along with a EGT guage would be ideal on these machines. the sleds run alot of egt guages on them to monitor based off of that instead of the ratios since they dont have that many holes in the dash. lol this doesnt need a hole though so it would be nice. it may even be able to be switched from machine to machine just by getting the right amount of sensors and such for each machine. lol glad you like it, it was worth the post. steve