Aren't there quit a few guys running injected birds with no PC 2 or 3 installed. Am I wrong in assuming the stock ECM will adjust to the slip ons or header. I'm running a Yoshi system without the PC2 and have not had any problems yet...but do not do much high speed riding.
Whats the scoop on the stock ECM and aftermarket exhaust?

I had my '99 dynoed and the exhaust analyzed right after I installed the D&D slip-ons, which have been on for about three and a half years now. The HC emissions were unchanged from stock throughout the runs with only a slightly lean condition at idle, conditions which I consider acceptable. I don't run a Power Commander, and have yet to see any evidence of an excessively lean condition; the plugs all looked good at last changeout.

I think it's presumptive to link K-Tool's unfortunate luck simply to the use of an aftermarket exhaust; I would expect any deleterious effects from an excessively lean condition to be exhibited by ALL cylinders, not just one.

it's my understanding that the fi ecm will adjust for whatever the bike is breathing, drinking or exhausting within a fairly wide tolerance.

imho :wink:

Without an O2 sensor, the bike will not "compensate" for changes in air flow. Aftermarket slipons make only a minimal difference, however. I'm quite certain the problems were not caused by the muffler change.

With just slip-ons installed, my bike seemed to run richer, with significantly more "soot" on the tailpipes until I installed the PCII.

When you look at the numbers in the fuel MAP, the PCII is actually removing fuel through a wide range, and adding fuel in only a small range.

I've also never seen a rod bearing go as a result of a lean condition, but many scuffed pistons, and wrist pin failures. While it's true that a long term detonation problem can result in a bearing failure, it would never happen without some sort of piston melting in the process. Even if the piston isn't melted, there will be a significant amount of burned oil on the underside of the piston, indicating a very hot burn temperature.

If it is in fact a rod bearing failure, I would suspect either a manufacturer defect, foreign material, or oil starvation to be the culprit.

In K-Tool's case, I think he had a small problem (probably CCT related), and the dealer either had no clue what it was. They then ripped the engine apart, couldn't find anything, so decided to change everything, or the dealer needs the work/money, and is scamming him accordingly.

My bike suffered from a lean condition and detonation due to poor tuning of the turbo. There was absolutely no damage what so ever to the crank, rods, bearing, ect. The only damage was on two pistons and cylinder walls and two exhaust valves.
Here are the pictures.
http://www.cbr1100xx.org/forum/viewtopic.p...4525&highlight=

:cry: