11 pro still bogging Please Help

[sledsnowco]

2011 pro with 4200 miles. I acquired a bog a couple rides ago and can not for the life of me figure it out. Things I have checked so far: changed fuel filter, checked fuel pressure, checked both clutches and springs, pulled exhaust valves and cleaned them, new belt, checked compression 107 in each cylinder at 7,000 ft, hooked it up to digital wrench and everything looked good including tps setting, swapped out ecu and non ethanol switch. It still bogs mostly on the top end. I can slowly get into the throttle and it won't bog until I hold it at wot. It's not giving any codes but acts under powered on the top end. It stopped bogging yesterday for a while and it felt good again and then back to bogging. Please help I know there's a lot of really smart people on here. Thanks Ryan

 

[The Fourth Wolf]

When's the last time it got a top end?

 

[sledsnowco]

About 2,000 miles ago I put in RK tek wossner pistons in. That was kinda my first thought since it seems to be all on the top end. You would think the compression would be lower than it is though.

 

[rmscustom]

Pull it apart and measure them pistons.

 

[04proxr800]

Is it a bog or feels like it falls off like a safety? When mine was to the bar under load it would just drop!

It's not doing it anymore buT I Changed the plugs and wire, more weight in the primary new exhaust temp sensor! Also could be the throttle safety switch in the throttle block or the ev siliniod!

 

[sledsnowco]

It's not so much like a bog it just falls off at wot like you are saying. Bottom and mid range feel super peppy and then it falls off.

 

[skiwiz]

my 2 cents

Check supply lines in fuel tank

 

[d8grandpa]

Sounds like bad injector, put in new plugs and check the burn on them when it does the bog.

 

[sledsnowco]

Check supply lines in fuel tank

I tested the fuel pressure and it was solid at 60 psi. What would the lines in the tank have to do with it?

 

[sledsnowco]

Sounds like bad injector, put in new plugs and check the burn on them when it does the bog.

I did that and noticed the mag side was looking pretty lean. Tested the fuel pressure on the track stand and was solid at 60 at wot. If it was a bad injector wouldn't the pressure drop?

 

[jdw1]

Subscribing
I have a 12 pro that is doing the same thing at wot, it feels like the exhaust valves are not opening. This started last spring, I did a Indy Specialty LR this summer so I know my motor is solid. I changed out the exhaust valve solenoid and that did seem to help a little but did not solve it. I have the injectors out for testing in the next day or two.

 

[sledsnowco]

Subscribing
I have a 12 pro that is doing the same thing at wot, it feels like the exhaust valves are not opening. This started last spring, I did a Indy Specialty LR this summer so I know my motor is solid. I changed out the exhaust valve solenoid and that did seem to help a little but did not solve it. I have the injectors out for testing in the next day or two.

That what it feels like but I tested that and they are definitely opening.

 

[Rmk_RDR]

Sounds crazy but it could be ur exhaust valve gaskets not sealing proper I've read about it a lot lately have to get the gaskets from the 14 pro to be the proper fitting and sealing just saying it would be a cheap and easy way to try

 

[flying frenchman]

Mine did this. Excellent low and mid but at 7300 rpm would bog and fall on its face, let off and the same would happen. I was gonna change injectors but took my powervalves apart and BINGO, both bellows were ripped. 3000 miles and there shot. Installed new bellows and everything is working fine.

So guys/gals, if you have high miles on your Pro I would recommend changing you bellows. I lost out on a good days ride. Hope you don't.

 

[flying frenchman]

Here's a pic of my worn out bellow.

 

[mtncat1]

I would check your injectors they don't always over fuel when they fail. their pretty cheap on an 11 good luck

 

[stormrider3]

This may or may not help, but it's cheap and easy to try.
Remove exhaust prop a clean with care, scotch bite pad works.

 

[SpeedWobble]

If you have the exhaust valves off make sure the little hole that goes into the cylinder is not plugged. You should be able to run a small piece of wire from the outside of the cylinder under the exhaust valve into the bore of the cylinder. Your valves will not work properly if this hole is plugged. This fixed my bog.

 

[sledsnowco]

I'm gonna pull my exhaust valves and check them in detail, hopefully I find something. Thanks everyone for your input.

 

[jdw1]

Injectors flowed and tested fine!
My exhaust valves are opening fine as well. I put 1/4 in fuel line on the stem of the valve so I could watch them open!

I am starting to think mine is over revving and the ECM is closing the valves to control the rpm's. It's clutched for 8000'+ and I'm at about 600', the thing is it did this at 10'000 last spring in Colorado.