Ok I am chasing a problem with my bike, and want some other input into possible solutions.

07 Heritage, TTS, 21H cams K&N Filter , S&S Slip on Mufflers.  I don't ride it hard except on occasion when I will give it a bit of a flogging and that is very rare..  Bike runs, starts well, no great issues with the bike aprat from the following, when I do give it some WOT , at around 3000-3500 RPM she just drops the power.  It pulls well up to that point then just loses it.  Change gears  and she pulls hard again till that point and the same thing happens.  I do not even think I am into PE Mode.

 I can open the throttle and you can hear the motor want to go as it just growls but it can't for some reason, just sort sits there and goes no where. 

 

What have I done so far, not a great deal.  I changed out my O2 Sensors on the weekend.  one thing I didn't do was zero the AFR's so I will do that tonight.

 

I am thinking  so far possibilities are:

Plugs?

Leads. I have got braided ones on but have kept the OEM's

Leaking Intake ?  But then I would thing you would have problems at any range. I have tested with LPG gas cylinder and nozzle, and swapped the intake gaskets just in case.

Leaking exhaust, checked the manifold flange nuts for correct tension,  ( Always check every so oftern as they do come loose)

I haven't looked at the intake module as yet/  What could be issues with that?

Crank Position Sensor?  Possiblity that it is failing but I would think it would be accross the board?

Coil braking down.  I haven't checked as yet but can do that.

Are there any other things that could be causing this issue.

 

Been like this for a while. I put it down to the tune I was running. But no matter what map I run it runs into the same issue. I will do a data run in the morning on the way to work and post where I can identify the problems.

Other ones I thought are possible TPS.

Sounds like a timing issue. Any detonation or pinging

AJ56
What compression and cam are you running.

Stock 96 with 21H cams. They run out at about 4800. I am not even getting close to that range. It has not always been like this. I only noticed it earlier this year when I was doing a tune on my bike. I asked Oz about it as he helped with the Map. He suggested a sensor on the way out.

I don't have any pinging that is noticeable. As I don't ride in that rev range all that often I have not been that worried about it. But It is annoying me no end. I especially noticed it on the way to Edenhope with the missus on the back. throw it back a gear to overtake and give it some and I could feel the lack of response from the motor.

I suppose it will a process of elimination. To describe it is the hardest part. Like the plugs breaking down at the higher revs. Consequently the bike feels bogged down. But until that point she runs fine and pulls hard.l

Did you or OZ do any timing adjustments to the map your running. I would install a fresh map with no timing changes to see how it runs. Sounds like the timing is out if it Boggs down and won't rev from 3000 to 4000 RPM. It maybe time to try the new MT8 with the cam analyzer.

I was talking via PM to a US tuner about my TTS timing and he stated. Steve Cole has the timing so so close on the maps it's best for the home vtuner to leave them aloan.

Just on an outside chance have you checked for sumping?

Hilly That was my next move Plugs and Leads but one at a time.
Hogbag, The timing on the maps were never changed. To much of a head ache. ( just being a lazy prick with the tune process)

Lonewolf. Nope she is not wet sumping. That much I know. If it was I would think you would feel it right through the whole engine range.

I will change my leads tonight and do a data run in the morning on the way to work... Just to see what comes of it. If this wasn't an efi bike I would go for a break down in electrical some where, plugs first then look at the leads. Just my gut feeling about it..

Could be a blocked air filter or a blocked fuel filter. Fuel injection regulator could be fucked. Braided Coil wires could be breaking down. I will go through my 07 manuals when I get home this week. Does it through any fault codes. Will it rev past 4000 rpm and come good to limiter?

Hogbag. Running a K&N filter, I have the recharge kit so can do a clean etc. Fuel filter maybe I will need to remove the Fuel pump to check that. As far as the coil wires, that crossed my mind. They are after market, although I checked the resistance on both wires and it problem area I have never really triedpassed that but that doesn't mean they are not breaking down somewhere. I still have the OEM ones here so can change them over. And nope no fault codes which sort of stuffs me up a bit as far as identifying the problem. As far revving past the problem area to the limiter I have not tried.I will have a look at my Vtunes and see what they say as far as hitting the limiter. By memory I never got there as I don't ride in that area... I will get back to you on that one.

Thanks Hog. food for thought.

The fuel lines inside the tank that run from the fuel pump to filter to regulator can rub together and get pin holes causing loss of fuel pressure. Take fuel cap of tank and turn the ignition on and look or see if hear a leak when it's priming up.

Thanks Oz that is something I never thought about. I will have a look at my Data Runs to see what range I got up to. Hopefully it is something as simple as that. I will hook up the Laptop in the morning and see what it tells me on the way to work. O2 Sensor data from start till work. I have also swapped out my Leads and put the originals back on...

I ran a data O2 Run on the way to work and will post some pics when I get home tonight.  I can't load them up from work.  I feel I have some funny results.  From what I can see the O2 Voltages are dropping to around the 50Mv but need to check the TPS % to make sure I am accel and not Decel. But even with Decel I should be getting something out of the O2's and the BPW both front and rear is very high in these areas.  Someone will be able to advise me what I am looking at

 

AJ

AJ can you run another map through the ECM for the ride home. The 02's could be full off carbon and not reading. If the bike runs good on the way home and revs past 3500 cleanly you have found the problem. A good ride will clean the 02's and hopefully Vtune from there.

Hog they were new on Sat.

Pic of the data run this morning.

 

 

There were a couple of places that the MV for the sensors were at 0.. Now it could be that the Target AFR is 13.4, and the MAP is 88.6. So noot sure on that side of things. But the 2 places where I was able to open up and get it to that area this was what was recorded.

PS disregard the lower hand side in the columns as I had the mouse over another area of the graph. The next pic is a blow up of that area