[NMKawierider]

I don't see where they tested the fuel pressure. Anyway I was re-watching a video on an injector operation and notices not only was the pattern inconsistent but it was double-firing and one was not the same as the other. To me that's a problem with the CPS or the ECU.

[Ulfthednar]

Thats something Ive been wondering . . CPS/ECU
Thats why I brought up the improperly seated plug on the ECU.
Mentioned it to the shop as well . .
Obviously I didnt get it seated properly at some point since I am the only person thats worked on it . . so I can only cuss myself out on that one.
but if that is not seated correctly could the movement while riding create small arcs that would have a detrimental effect on the ECU . . .

[NMKawierider]

Thats something Ive been wondering . . CPS/ECU
Thats why I brought up the improperly seated plug on the ECU.
Mentioned it to the shop as well . .
Obviously I didnt get it seated properly at some point since I am the only person thats worked on it . . so I can only cuss myself out on that one.
but if that is not seated correctly could the movement while riding create small arcs that would have a detrimental effect on the ECU . . .

Not really sure but anything that could send a second signal pulse to the ECU could cause the ECU to fire again. I do know the sensor has to be seated and positioned exactly perfect to get the correct distance from the rotor and timing position. I assume it also has to be grounded to discharge any static charge buildup.

[Ulfthednar]

Well . . I see why testing the fuel pressure isnt a thing . .
no test port.
It Tees to the rear injector then elbows to the front injector.

So if I want to test the pressue I'll have to rig a port.
Could be a good time to install an inline filter.

Odd theres a filter to the filler vent but none in the line from the tank to the injectors themselves.

[NMKawierider]

Yeah they don't make it easy. On my Z all I have to do is pull one side off the inline filter and slip on the gauge. Then turn on the key. I do have to pull the airbox to get to it though.

[Ulfthednar]

Been reading through the book. I can test mine by connecting directly to the pump outlet.
It also has test specs for the CPU and speed sensor.

I believe the only other things that affect that part of the system would be the ECU correct?
Everything else is isolate. Theres only ONE point of entry for fuel so the glitch HAS to be in there somewhere.

I am pretty sure at this point the fuel issue is electronic/electrical in nature.

Once I figure out what is causing that then I'm going to pull the heads I think.
There is enough variance in the comp and leak down specs to warrant it I think.
One cylinder like NEW and the other cylinder just about to the out of spec range.
But the Bore camera showed the Cylinder walls are in near perfect/like new condition.
Which should rule out bad or cracked rings but I want to look at those too.

This thing was running flawless and consistent up until I put that injector cleaner in it.

In the meantime I think I am going to pick up another one.
Im usually not frivolous but riding these days is the only sanity sanctuary I have.

Worst case scenario I end up with a complete parts bike, spares of everything and so forth.

[NMKawierider]

They did a leak-down but only showed the percentages. On the low cylinder where was most of the leakage? Valves or rings? and if valves, which ones? And has anyone set the valve lash recently?

[Ulfthednar]

They really didnt say what they thought and didnt want to go further without starting to tear it apart.

And they kinda well . . techs more than mechs I think. They mighta got lost sorting out a holley craburetor.
The computers couldnt tell them what was wrong so they couldnt think much further.

No codes anywhere at all on the machine.

I'm maybe a bit fanatical on my valve lash and keeping an ear on it.

I had just checked the valves (which were right where I left them)- I do a pass no pass double check when I do mine. Id checked the tensioners, belt, installed new plugs etc and so forth before I added the injector cleaner. In short the only thing I hadnt done was grease the wheel bearings yet.

I learned from my Dad and from experience to listen to the sound and FEEL of an engine rather than waiting for something to break.
 
So I caught it without causing anything catastrophic but Im still sorting out WHY its dumping/wasting fuel.

I want to get a fix on that before I pull the heads and check my rings and stuff.

Maybe I should check and make sure my coils are firing consistently as well. That could cause a lot of unburned fuel to seep down the cylinders too.

[NMKawierider]

So...we don't know where the majority of that one cylinder's leakage is. Can you rig regulated air to that cylinder and set it on TDC of the compression stroke, lock the primary in place so it won't move, apply the air...about 50psi.. and just listen for it..at the air intake/air cleaner, the exhaust and at the open dipstick? I would also take the engine speed sensor back off and rotate the engine as I inspect every MM of the rotor for...  anything odd...or evidence it has been making contact with the sensor.   

[Ulfthednar]

yes. Ive got a pretty good set of adaptors to work with now.

I can set my output air pressure and run a shorter hose to help stablize pressure in this weather too.

At $129 an hour shop time I figure learning on the way and doing my own work is going to pay for itself.

[Ulfthednar]

AS an Aside:

Just so people understand my take on this issue Im having.
I DO NOT BLAME the engine or CFMoto in general for this problem.
My engine was running excellent until I added the injector cleaner as per recommended procedure for it's annual.
Yes I read the label and followed the directions as well.

The engine ran consistent, NEVER failed (I did have a fuse issue once because of that stupid little buzzer), never stranded me, never failed to start even when cold and NEVER over heated.

My perfomance and mileage were on par with what others have related and maybe a bit better mileage wise.

I didnt make it through two gallons of gas on a FULL TANK with slightly less than 1 oz per gallon cleaner as per instruction on the label when I noticed something wrong.

Despite ZERO codes being thrown I discovered one bad injector and am slowly working my way through other fuel system related components.

I took it to the shop I bought it at and My basic diagnostics of the engine match theirs pretty closely nor could they find ANY codes being thrown with their full range of gear while communicating with CFMoto factory.

I am going to go through the engine once I find the culprits because theres a fair difference in compression on the two cylinders.

I changed out the oil and found it full of fuel and carbon washed out from the cylinders. The cleaner apparently ate at least one injector seal and with the cleaner scouring carbon the excess fuel washed it into the oil sump and I am still finding fuel present in the oil.

(I wont be following the prescribed protocol on that EVER again and will be switching to a different brand of cleaner) . .

That said I do not believe for a minute the engine "just failed" . . . Its my fault for adding the cleaner of course and without a diffinitive line of mechanical failures Im going to eat it money wise.

But the engine did not FAIL from general riding and routine maintenance.
I took pristine care of it and paid close attention to it which is why I caught on something was wrong in about 15-20 miles.

Im not after bashing a product either  . . just working my way through "how did I break my bike" and getting it running well again.

As I get parts tested out I'll share the info Im finding as best I can.

[NMKawierider]

Do we know what the fuel pressure actually is? If you are that sure it was the cleaner, some cleaners damage injectors, yes but some damage pumps...and it never that they make more pressure...its that they make less. And sometimes the filter media that is used on the intakes are effected. You would think low fuel pressure would throw a code though. But it would be good to know if the pressure and volume is to spec.

[Ulfthednar]

So I might have found something relevant today.

Im swapping my orange body over to my 2023 that I picked up. (at $7100 closeout) the deal was too good to pass up.

Anyway. I was working on swapping the dash bits and my grip heat over and I happened to find two of my main wires fused together on the main harness bundle.

The red and green were fused and when I separated them were showing bare copper in between.

I have a new CPU and speed sensor on hand already but have been a bit busy so havent had a moment to test that avenue out.

But . . finding that fused wire . . . it actually made me somewhat happy, ive actually FOUND something that wasnt right, that I could repair and proceed from.

[NMKawierider]

Yeah...that would do it.

[Ulfthednar]

The sad thing is . . Im kinda going through the 2022 inch by inch . . Im gonna find the issues(s) (even if they were my screw ups)

Kinda annoyed cause the "technicians" just threw it back together and missed some bolts, didnt have the chain tensioners properly torqued and other stuff . .

I took them in a semi stripped, freshly washed bike so they didnt have to fight through dirt and accesories and I got back a bunch of loose bolts and improperly installed parts . . .

other than general staining the bike was clean  now its got oil seeps I gotta straighten out all over the place.