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Unfortunately, it was announced in December that JHA have gone bankrupt and are no longer trading. 

JHA Kits.

They now make 2 types, the first consisting of 1 power valve cylinder, 1 cylinder
head and insert, reed block with carbon petals, exhaust stub, expansion chamber
and silencer, CDI unit, wiring loom, battery kit, servo motor, cables and control box,
front fairing stay, 2 flat top pistons and piston rings, modified gearbox selector drum
and cover, all the associated studs, dowels etc. for fitting, software to alter
power jet and timing settings and a video CD set-up disc.

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The other kit is a bit special if you have just won the lottery!!
They call it their “A” kit and consists of 2 power valve cylinders, 2 cylinder heads
with 4 inserts, 20 flat top pistons, piston rings and gudgeon pins, 2 heavy crankshafts,
4 low friction main bearings, 1 pair of modified crankcases, 2 exhaust stubs and
titanium expansion chambers, 3 silencers of different internal diameters, 40mm.
Carburettor, large volume air box, 2 aluminium clutch plate sets, 1 radiator, 4 power jets,
2 reed blocks with carbon petals, CDI, wiring loom, modified gearbox selector drum
and casing, servo motor, control box, battery kit, various gaskets, O rings, studs
dowels etc., for fitting and all the relevant software.

Also included in the deal is free replating and carriage of 4 cylinders during the
course of the year, free visit by JHA staff for set up and technical service once
during the season and free one day practice at Almeria in Spain.

They are quoting 53.8 bhp for this engine.