EVO Engine noise question

I had my EVO rebuilt back in October. It runs strong now and really great at highway speeds. However, I have been keeping an eye on things as I put on miles and it has always had this rattle sound that I just can't figure out.

There is this rattle sound on deceleration only (throttle closed). I don't have a tach but it is obvious 30 mph and 3rd gear (in that RPM range). I had a mechanic listen to it and he thought is sounded like the pushrods hitting the tubes from possibly loose valve adjustment. So I brought it home and readjusted the push rods. They are RevTec aluminum rods, 36 threads per inch. To get .100 inch setting I turn the rods 3.6 turns or 22 flats. I made sure I was doing it right, also, waited 5 minutes everytime I turned them 1 full turn etc.etc.

Anyway the noise did not go away and the adjustment didn't seem to be out when I took it apart. I was counting turns as I loosened them.

The only thing I can ask is if anyone else has had this kind of noise with aluminum adjustable push rods. Also, the heads where shaved so that might change the geometry or angle of the push rods slightly.

Any feedback on this kind of noise is appreciated. I do my best to ignore other valve train noises but this one is different.

Thanks,
Tom

So chucktx...since you don't like aluminum for high stress and vibration, I have a question. Do you fly on commercial airlines?? Sorry for being a wise a**, but just couldn't help myself. :roflmao: :roflmao:

Think I'm still trying to justify my new Mustang seat

if the rods are adjusted properly and the sound is only better emitted at this rpm range it maybe the lifter/tappet for that valve.i dont think a lifter is to price maybe 60 bucks but it will take a few hours to change out.if it is the lifter i would change them all out

My brother in law just bought new lifters for his RK. They were $64.00 a set per jug, so $128.00 for all four. Best part was that when he went in to the steeler to get them, their computers were down. They writing all sales by hand on order pads and they only charged him for one set.

You can get it to make the noise at idle with small throttle changes. again it is on the deceleration and only at one RPM. It is a lot more noticeable on the road like I said 30 mph in 3rd, or I will do what Ken said and put the rear wheel up. I have one of those Slick front wheel holders that keeps the bike upright. That was money well spent on that thing.

Thanks for all the input from everyone. I will try to get an indy to listen to it one more time, since I eliminated the valve adjustment as a possibility. Then I will go for new lifters.

BTW the aluminum push rods are for high revving. They are lighter, of course, but they are thicker for strength so they won't fall out of the sky

I should not have gotten them since I don't have a race motor. But I am a fool with not much money left.

Thanks all.