If you want less vibrations try a salsbury 330 or comet 340 (same clutch) hard to get but from what I've herd the driver is balanced nearly perfectly and has little to no vibration and its set up for more power and rpms than a comet 30. I think GTC sells a copy but its nearly 400$
The following may sound like I'm sponsored, but I'm not! In fact I've paid in total (Juggernaut+Tshirt+shipping to Netherlands+handling+import tax+FedEx handlingcosts) around $200,-. I'm willing to except sponsorship, though...
It's called Juggernaut. I installed it today.
It is a direct replacement for the stock driver. I could use the same spacer and it lined up perfect with the driven.
I could also use the same bolt that threads into the crank.
It is just 1,2% heavier as the Chinese driver (with zinc weights):
Juggernaut: 1686 grams
Chinese driver: 1662 grams
So what about vibrations?!
A lot less as to the Chinese driver and I think vibrations that still are there are "normal" and caused by engine.
The Chinese driver created vibration as soon as it started to engage, that's history with this new driver.
Happy with that.
FYI: I've installed it on "stock" GX 160, governor removed, Chinese Mikuni, billet rod, alu flywheel, stock valves, stock cam, 18lbs springs, slightly higher compression. 15T sprocket on driven and 85T sprocket at my rear tire.
The engine is allowed to make more rpm's and it does. I've measured it around 6500 rpm. The driver does not "close" as much as the stock driver does. With the stock driver it goes into overdrive and the new driver (Juggernaut) does not go into overdrive (I think). The belt doesn't climb as high as it does with the stock driver. So rpm's are there, but if it is faster, I could not tell.
I have no speedometer to measure.
It "sounds" faster, because of the higher rpm's. Did it feel faster? No, or not much if it is. It will be faster if my engine makes more rpm's.
Overall I'm happy with the purchase. Designwise it is another level as the stock driver is.
PS: noticed the "dirt" on my fender and gastank? It is clearcoat/laquer that can't resist gas... It turns "sticky" and collects all kind of dust and dirt. Another lesson learnt and a new paintjob is requirred.