Yeah, Mr. Spittle I'm aware of Mr. Prime, but I've never met him. A mechanic I used to work with, who was a little older than me, claimed to have helped him syncronize the two engines on his "double". My late buddy (the mechanic) was a pretty heavy alcoholic by this point, so I didn't put a lot of stock in most things said, although I'm not saying he didn't work on it. Rhode Island is such a small state that it's normal to know just about everyone who has the same interests, it's just that I was a little younger than those guys. This leads me to a question I've been wanting to ask for a while: what was the usual method of indexing the two motors together? They didn't fire simultaneously did they; I always figured they were as evenly spaced as possible. Oh yeah, the Motorcycle Warehouse (Framingham MA.) had a nitro shovel in the eighties and I think Dick Prime may have been the pilot, but I'm not sure. This is a great thread btw.