Villiers clutches?

GDay all. I have a number of 98cc Villiers engines from reel mowers. I bought them with the intention of using them on motorized bikes (thread is posted in pride and joy) and have built one already using a hand style tensioner clutch. I was wondering if you are aware of centrifugal clutches that work with this engine. Ive found it hard to get info on these engines (which is why im here) being from Australia but have read these engines make 1HP @ 2700rpm, is that right? And if so it means a normal centrifugal clutch wont work, do you guys know of a solution? Im guessing the clutch on the mower wouldnt be strong enough???????

Anyway heres some pics....

I have 2 of these and know them as 98cc Villiers "slanthead version" and my favourite




and i have 2 of these ones also



Heres the clutch setup i made for the first Villiers bike, but id like to try and use a centrifugal clutch if possible



And heres the first Villiers bike

That bike is sure something! Sorry I've had nothing to do with Villiers engines with a clutch.

Stu.