I suggest Onan engine users stock up on those electronic ignition parts- they are getting scarse. When Onan stopped producing small engines, production was also cut on replacement parts, so supplies are limited to what places have on hand and a little bit of aftermarket stuff from Stens. Mechanical components should be around for a while as Onan engines were built strong, but the ignitions had a limited lifespan thus a higher demand for those parts.
-Fordlords-
As of the date of this post the electronic ignition module part number 166-0785 found on the "P" series engines, P216, P218, P220 & P224 is readily available and currently in production by Onan. There is no shortage at all. The Onan opposed twin engines are no longer in production but the vast majority of parts to rebuild or service them are being manufactured on a regular basis.
The modules are an electronic device and age, heat, vibration will at some point take it's toll and they will fail. I have one that is still going strong after 21 years on a P218G.
Onan has NOT stopped supporting the huge number of these engines still in use today on Garden tractors, welders, generators and many other applications.
Oversize pistons, rings, rods, bearings, valves, gaskets, seals, oil pumps etc. are available for not only the early "B" series engines such as the BF, BG, B43, & B48 but also for the CCK series engines going back to the late 60's.
A large number of minor parts are also in production or sitting in their warehouse just waiting for someone that needs them. This is the main reason for the high cost of replacement parts from Onan.
No other major manufacturer maintains the enormous inventory of spare parts that Onan does for engines that have been out of production for ten, twenty or thirty plus years!
Because Onan stopped manufacturing the "P" series engines several years ago it is wrongly assumed that parts are hard to come by or there is a "shortage".
They ceased production of the CCK back in the mid eighties but you can still get everything you need to rebuild one just like new.
It won't be cheap to do but Onan engines are not cheap to begin with. Those of you still using your tough little garden tractors from the 70's already know what they are worth after 25-35+ years of use.
Those Onan engines were designed to be rebuilt many times unlike the "disposable" engines being made today.