RE: Old CL engine help
Donald,
If you use these engines, bear in mind that they are mostly made with iron (mehanite) pistons with steel cylinders. This "old iron" has different characteristics than new engines and need different fuel. I would suggest you get some fuel with no synthetic lube...use all-castor lube. For the small engines, about 20% castor is good. For the large ones, use at least 25% castor.
The reason for all-castor fuel is to allow the castor to build up a varnish seal on the iron piston. This seal will be removed by even a small amount of synthetic lube. Perhaps some of those engines' seal may have been removed by running with synthetic lube. Fox Superfuel (28% all-castor) was made to restore or create this seal to extend the life of engines of the day. The ABC, ABN, etc. engines will not make this seal because of the high-silicon aluminum pistons.
Perhaps the engines are just plain worn out...but it's worth a try.
Nitro content should be 5%-10% for the large engines, and 15%-25% for the small ones.
Might that Spitzy have a "9" on the tank? If so, it is a Spitzy .045. I have one on a Scientific "Little Bipe"
There may be a lot of fun left in those engines.
George