No power at 5k plus

Shawns · Aug 20, 2015

Here we go. At 6k on stand 1st gear, does not bog down.

Shawns · Aug 20, 2015

Shawns · Aug 20, 2015

Shawns · Aug 20, 2015

Cooter · Aug 21, 2015

Bummer. Since it RPM's ok on the stand, but not on the road I'm still sticking with fuel pressure or restriction as the problem. Any luck on the fuel pressure test? Zip tie the gauge to the bars and go for a ride. See if it dips way down when you are hard on the throttle.

If the symptom isn't showing up on the stand, you'll need to datalog while you are riding.

FYI You can screenshot on a Mac with CMD+shift+3, and it will be a .png file on your desktop. Or CMD+shift+4 lets you drag a cursor to highlight just one area:up:

Shawns · Aug 21, 2015

The kit we had didn't have the fittings I needed. I'm probably going to pull the pump and check the sock. One of the old timers I work with used to race bikes and he agrees with a restriction issue. I'm going to try this weekend. Every street around my house is ground up to get repaved. That is a bitch to ride on.

theshinenz · Aug 26, 2015

Found the issue with mine today, think it was a combination of fuel pump and injectors, more so injectors though, but there was a bit of improvement after changing out the pump. Once injectors were swapped shes now and awesome machine again ;-) I tried cleaning the injectors by soaking them overnight in injector cleaner but didnt make much difference, be sure the injectors you tried were good ones.

Shawns · Aug 29, 2015

Well...Still not sure if its the pump is part of the problem. The rear cylinder head is definitely a problem. One of the valves I can see through the throttle body is not moving not sure which is which. if your on the bike it's the right valve. The 2 I can see on the front cylinder move freely. WTF.

Shawns · Aug 31, 2015

Yep...she's broken..Broken cam follower. Still need to get the valve cover off to see the extent

mrlogix · Aug 31, 2015

don't forget to clean the oil strainer in the bottom of the motor:upset:

Shawns · Aug 31, 2015

Replacing both heads and doing the valve service at the same time. I have only found 1 piece so far. Wish I could get the rear valve cover off all the way to see if I can find more. I'm going to make an engine stand and start playing.:mad-new:

Shawns · Sep 10, 2015

Anyone have a camshaft locking tool to purchase or borrow? I have the crankshaft.

Shawns · Sep 12, 2015

There be gold

hottschott · Sep 12, 2015

Having exact same issues but around 4k rpm on my 08 xb12stt...=( good luck man! at least you found the culprit!

Shawns · Sep 13, 2015

Wish I knew what the brass particulates are from? Well they at least look like brass. The larger pieces are plastic. I'm gathering from chain guides.

heagachongoose · Sep 13, 2015

Oh poop. Good luck man.

Shawns · Sep 13, 2015

I'm working on a deal for a lower half of the a motor just in case. I only am able to toy with it a little at a time. I'll hopefully know the extent when I get it pulled.