1. I need to choose a timing chain for a one cylinder combustion engine. I have found two diffferent catalogues but both involve problems... 2.a First problem from following catalogue: http://www.rexnord.eu/fileadmin/Rexnord_Kette/PDF/Catalogue_Flyer/Auslegung_Kettentrieb_E.pdf [Broken] The smallest pitch to choose is 12.7 mm (page 22) Needed ratio: 2 This gives me a a too big reference diameter for my second spocket: about 105 mm I need a reference diameter smaller than 70 mm 2.b Second problem from following catalogue: http://www.crossmorse.com/pdf/DriveDesign-Cross-Morse.pdf i need a center distance between the two spockets measuring <239 mm. The guide (page 5) tell's me that the center distance must at least 240 mm 3. * Is it possible to choose a chain from this calalogue or is it just impossible? * Am i right about the center distance? Are there other possibilities?