Just finished this project I started 12 months ago, Had four of these 90's I'd collected so built one good one, with some tweaks. Rebored to +0.50mm, far too many hours spent flowing and porting the block, lightened and balanced rods, balanced pistons, skimmed head, carbs venturi machined out on lathe, ditched the choke butterfly's and fitted a Merc primer, two stage boyesen reeds. Removed leg silencer can and made my own exhaust tuner to a proven design, and turned a set of solid engine mounts. Resprayed it and 2k clear coated and new decals from US.
Need to sort the hull for it now