waffle type noise on over run & rocker shim

[1340evo]

Hi All

got a few miles on the re-build now and all is well.
I guess you listern for noises more and more and have got a bit of a wafflw, waffle, waffle type noise on over run at the lower RPM range.
I did think it was the primary chain for a while or the EV27 I fitted maybe, but starting to think its more top end.
Thinking back to the re-build, I'm not sure I measured the end float on the rockers as I'd seen its not required on Evo's. But have seen since that folks do shim Evo and machine things so a .010 min shim is used, fitting on the non-thrust side (so inlets opposite to exhaust).
Maybe something I can check this winter.
But do you think it could be this thats making the noise in the first place?

Or stop dicking about and just ride the thing 

thanks   

[lilchief]

Is it possible it's intake (carb) noise now that you've installed a new cam?

[1340evo]

Is it possible it's intake (carb) noise now that you've installed a new cam?

It could indeed and maybe is.. what does lose rocker shafts sound like, more a ticking noise?

[lilchief]

Is it possible it's intake (carb) noise now that you've installed a new cam?

It could indeed and maybe is.. what does lose rocker shafts sound like, more a ticking noise?

I would think rockers would be more of click, or even a banging noise of loose. Years back I put an EV46 in my Evo, and it immediately had more intake & carb noise.

[1340evo]

May be the issue for sure, i think there is a lot more overlap. on tickover it firest every time on the front, but only sounds to fire every second time on the rear, again this is down to the cam, bring it off tickover its off like mad.
I guess it could be the overlap im hearing as the rpm gets down...

[Rockout Rocker Products]

Loose rocker shafts are more of a ticking/tapping noise.

 I'll add... I have yet to see any case where rocker end shimming made any real difference in noise.... I suspect any changes may be coincidental to the process of the shimming... relocating things & such.