Bow vibration

[Ray Watchman]

Hi guys. My son has just bought a set of mid-range W&W carbon limbs to fit to his KAP Winstar 11 riser, which was originally fitted with a set of entry-level standard laminate limbs and dacron string.
Problem: the whole bow vibrates like fury when he shoots the new carbon limbs. I don't mean limb imbalance-type vibration that can be sorted by tuning, but what is an almost low-frequency "buzzing" that seems to originate with the bowstring and carry through the riser. Like the riser has become a "sounding board" to the vibrating string. It's very uncomforable and disconcerting for my son and happens with a fast string as well as the dacron.
The new limbs are fine and shoot very well, without vibration, on more expensive risers we have tried. Meanwhile a borrowed A-bomb and doinker are helping to supress the problem to a certain extent.
Anyone had a similar experience and if so, know of a remedy?
The Winstar is a very nice entry-level riser, but with progress to good-quality carbon limbs, maybe it's simply time to upgrade the riser as well.
We'd be glad of feedback from those with the techical experience in this area. Thanks.

[burt666]

can we know a bit more on the gear? brace height? tiller? bow length? string material / strands? draw length? poundage at fingers? shaft spine and make? etc etc...

just to rule out eventual gear / tuning issue first??!

[TrevorK]

Also check the stabalisers, I had an extension come loose internally and vibrated a bit

[The One]

You could try adjusting the braceheight a bit :)

[whiz]

Yep. I'm with the brace height adjustment theory too.

I'm convinced that brace height tuning is the most ignored part of recurve bow setup.

[Ray Watchman]

Thanks guys. As a first step we'll have a look at the brace height tomorrow at the range. It's rather like a harmonics, sympathetic viabration type of phenomenon:archer: . In any event, the lad is now buying a competition-level riser, so watch out world!