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0304 636 6k rpm stutter.

3K views 19 replies 6 participants last post by  JOEY11 
#1 ·
Okay guys, 0304 636. Recent rebuilt top end. Dyno shows that it's killing fuel and spark around 6k rpm at any throttle position. Sensors have been swapped, throttle bodies and ignition coils swapped as well. Tested cam position sensor and crank position sensor. Also idles a little rough. Plugs are new.
 
#7 ·
No power commander, it's stunted so kickstand sensor is deleted, tip over sensor is deleted. Everything stock other than exhaust and sprocket. Ran fine before the the second head I put on it. Mechanically sound, timing is perfect, valve clearance is perfect. No codes.
 
#9 ·
I can't see why it has issues at one specific RPM. That's the unusual part. I presume it clears up above that point?

If not, I'd be looking at the fuel pump.

A glitch in a narrow range is something I would expect to be vibration related.runs poorly from a certain point and above, state of tune, fuel delivery, etc.

Since you replaced the head, what are your compression numbers? What did you set the valves clearances at? Are you sure you're not off a tooth on the timing chain?
 
#19 ·
Cams? This is a interesting glitch.. several question marks in a row = ???????? smiley faces

So the original problem was 6k,, now 12k..

I'm far from a engine expert, so I'm wondering what caused you to replace the cams and why.
When you say won't go past 12k,, how does it run up to 12k and what happens at 12k.
 
#20 ·
Are the valves adjusted correctly? Weird that the stutter moved in the rpm's with a cam change. I could tell in my mustang with a solid roller cam if the valves weren't set correctly and it would be noticeable at certain rpms depending if the lash was set loose or tight. I've never worked on a bike engine though.
 
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