Pieter, the (other) Manos and my self looking to modify a 200VMax I found here for F1 and Open class to put on the FALCON (not mine).
This is what we were advised from the Yamaha Moderator from www.boatsetup.com.
The idea is to keep the weight of the 200 but to increase power to 300 bhp.
Modifications to the powerhead can give a great deal more HP from this unit
(he means super charger unit)
You can start by changing the exhaust divider plate and tuner to those for the old V-6 Specail or Excell. The first was built in 1985 and 86. The second was from 1987-1989. This with the carbs from them would give 25-30 Hp and a lot better acceleration. Porting as well as intake and other modifications can get you to 300+ HP. Hope this helps.
Any chance any of those spares from SA??