EGA

[HaulinAshe]

I might just have to break down and buy an Exhaust Gas Analyzer to set my CO levels. I'm convinced that Yamaha may do with FJRs, what they so often do with YZFs, ship them too damn lean from the factory!

Anybody have an opinion on this EGA?

EGA listing

Any other brands/sources suggested?

 

[jestal]

Since the bike has an oxygen sensor and a three way catalytic converter the fuel injection system is set up to run at 14.7:1. That isn't "lean". It is chemically correct or stochiometric. No one would go to the trouble to put a three way catalyst on a system and then "ship it lean"... The cat will not work when lean. It will only work at 14.7:1 exactly...which is why there is an O2 sensor in the system for feedback to ensure the system runs at 14.7:1.

Not saying that you can't richen up the open loop calibration...but the O2 feedback will immediately cause the system to remove the excess fuel. If you disconnect the O2 sensor, obviously the closed loop system cannot correct any more so that is another approach. Realize, though, that the bike is not likely to be "lean" per se. It is set to run at stochiometric. Engines in the past without catalysts were typically set up to run lean to reduce the HC and CO levels produced as those were the pollutants most under scrutiny on motorcycles. Yamaha took the next step with the catalytic converter on the FJR to eliminate HC, CO and NOx, which requires that the system run at stochiometric, not lean.

 

[Fabone]

The Gunson is the one everyone uses. At the top right is the link I gave you before, that tells you how to deploy. John has the best price around.

 

[evil_henchman]

The O2 sensor doesn't come into play until after about 2500 - 3000 rpm. The CO adjustment deals with fuel control at low rpm without the O2 sensor being involved. Once the O2 sensor kicks in, the ECM ignores the CO setting.

Low rpm is exactly where it's going to be too lean. Mine was so lean it was almost undrivable in a parking lot, etc. and I took it back to the dealer at about 900 miles. They "checked it out" and told me that it handled like all FJR's and the owner has an FJR, blah, blah, blah. I told them I was sorry the owners FJR was screwed up too and that I wanted my money back. That got their attention, they got with Yamaha and "fixed it" under warranty.

I say "fixed it" because here's what they did: I made them show me the mechanics worksheet so I'm confident they did what they said. I don't remember the exact numbers so I won't give any but 2 cylinders were high CO and 2 were low but within Yamaha "spec". All they did was lower to the 2 high ones till they matched the low ones which were at the low end of Yamaha's way too low make the EPA happy "spec". They actually made it worse! :angry: And they wouldn't budge, being more interested in keeping Yamaha and the EPA happy.

They did install rivnuts so it wasn't completely wasted effort. Pretty long winded way to tell you I don't know anything about the EGA you asked about eh?

You'll get better results doing it yourself is all, no matter what EGA you buy.

 

[HaulinAshe]

I've noticed what definitely sounds and feels like one cylinder popping lean at low RPM, low speed pulls. So I've expected all along that one or two cylinders are either lean, out of throttle sync, or both.

I'm buying an EGA and checking it out. I've managed to tweak the YZFs and make them hum. This FJR is just too good of a blue bike to not have it purring.

Thanks for the input!