I'm hearing a little top end noise at the top of 2nd and 3rd gear under hard acceleration. its not excessive but I hear it. bike has been dyno tuned and the noise has started after the tune. I loaded my FM tune which I ran prior to the dyno tune with no top end noise that I could hear and I have the same issue. when i picked the bike up the tuner informed me that it sounded like I had a weak lifter which I had experienced prior to taking the bike in. top end was tapping a tad on initial start up. got the bike back and installed a set of the Johnson hylift lifters and no more issues on start up. however, I still have the slight valve train rattle at the top of 2nd and 3rd. I am not receiving any kr on the PV but I went ahead and removed timing and added fuel in the range I am experiencing the noise. I even pulled timing prior to that range.
if I need to remove the rocker box what do I need to look for.
sounds like its only the front cylinder. any ideas. running s&s pushrods at 4/3. should I try another flat or 2 on that cylinder.
thanks

 

Have a look around my website, sounds like you might be experiencing rocker shaft tapping... there is a cure

John @ Rockout

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thanks john..I failed to mention I already have the rock outs installed.

 

It's you lifters.. Depending on the Johnson Hylifts you got, they are probably collapsing at higher Rs. The best way to get rid of the noise that I know of is to adjust the pushrod 1/2 turn off of bottomed. You can also add travel limiters and adjust per instructions.

 

thanks for the reply max.
I had the same noise with the woods lifters so I swapped in the Johnson's.
the noise starts around 2300-3000 rpm. I'll look into the limiters.

 

Well when you said the top of 2nd and 3rd, I assumed you meant say above 4000.. Woods gets his lifters from Johnson so it may be a lifter collapse issue but it does seem pretty low.. I installed a set of johnsons in my 07 egc when I rebuilt the top end about 12000 miles ago They rattled pretty good starting at about 4000 (oil temps in the 210F range) with the adjustment in the middle of lifter travel so I adjusted them to 1/2 turn off of bottom. They now only start to rattle above about 5000 rpm.. Bike has a Woods 777 cam in it which is likely part of the reason for my rattle.

Try adjusting them 1/2 turn from bottomed to see if the noise moves up in RPM range.. If so and it still bothers you, try limiters or a different brand of lifter.

 

ok..something just occurred to me. when I replaced my lifters I saw a witness mark approximately 2 inches from the top on the front exhaust pushrod. could my rocker plate need realignment. I believe it happened when i installed the rock outs. last night I readjusted the pushrods on this cylinder and this morning when spinning the pushrods i can feel a slight drag when spinning the exhaust pushrod. i do not feel the drag 360° just one spot during the turn. could it be its touching the rocker plate. intake pushrod is smooth.
looks like I'll be pulling the rocker cover.
anyone had this issue before.
thanks

 

It's not touching the rocker supports but more than likely touching the upper pushrod tube. There is a big cult around fixing this but I've seen the marks on a quiet motor. The best position seems to be with the rocker support pushed to the left right side of the motor while tightening down. Boring the upper part of the can get you some clearance.

 

I found centering the support plate makes for pretty quiet. A well know tuner once told me pulling plate all way toward cam side (right) makes for least contact. You say push it left side....boy that’s the full gamut right there.

 

You're right, I got it wrong.. Don't know my right from left.. Push it towards the cam side of the bike.