Didn't say the whole cylinder was painted, just the small spot behing the spark plug ...A&M had some kind of code using two different colors in a circle about 1" diameter...Never saw a bead blasted A&M cylinder, just the coarse blasting on the Brison...Who knows why so coarse, they look better when blasted with fine glass beads...
I don't think the guarantee refers to crash related bent or twisted shafts...I think they're trying to reassure buyers who remember A&M's bad cranks that theirs are better...The guarantee started out at less than 5 years..
The Brison in the picture has a completely different crankcase and sensor..The A&M bolts together from the front and is split vertically in the middle....I haven't seen a Brison apart, but I suspect the A&M they copied was the 3.2MKII with the cantilever crank, not the A&M with the bad copy of the Sachs crank and bad big end rod bearing....I can take a picture of one of the A&M twins with their homemade crank, it's up in the attic...Worst twin crank I ever saw...
all the pieces were machined too loose on the press fit so someone drilled through all the webs and pressed in pins to try to keep it from twisting...In addition the cylinders were both 2.4s but from two different styles, one rounded fins and one squared off...No wonder they went out of business......