The engine parts are here. It took a long, long, time. A lot of this is made to order so I anticipated and planned for a wait. Therefore, the delay is not a problem.
The 865cc engine with 10.5 to 1 compression was at a disadvantage in the 1000cc class. This is the 994cc kit from Triumph Performance (TP). The first picture shows most of what comes in the kit: Arias 11.5 to 1 forged pistons, Cometec copper head and base gaskets, all sorts of o-rings, gudgeon pins, and pin clips. The kit comes with stronger engine studs. TP said I would not need them for my milder street engine. Also included are heavier duty Barnett clutch plates and crank and rod bearing shells with racing clearances.
The pistons and pins of the old 865cc engine were teflon coated. I was not very impressed with this. This time the pistons, rings, pins, cylinder, and crank bearings have "WPC Metal Surface Treatment."
The pistons are made to the compression ratio specified by the customer. I chose the lowest, 11.5 to 1. This seemed to be appropriate for a street engine running on pump gas. The piston is shown in the second picture. Note the flat crown. This is a lot different than the tall crowns on the pistons in my old BSA with hemi combustion chambers. Thin or thick rings are supplied as requested. The thin rings resist flutter at high rpm. TP builds Bonnevilles that rev to 10,000 rpm. My rev limiter kicks in at 8,400 rpm. TP said the thicker rings are better for this milder use and I ordered them.