lo dicho, esto no ha resultado nada nada facil, a ver si se entiende y tiene utilidad para alguna otra persona, un amigo dice que todos los motores son iguales, esencialmente una puñetera bomba de vacio, pero luego cuando bajas al menudeo, pues...como que no
nos situamos, año 1934 R2 monocilindrica 200 cc
esto es un poco un compendio de lo aprendido durante varios años de miserias y andanzas en la oscuridad,...solo pretendiendo aportar lo experimentado
"you never know how easy is to drive and keep actual cars until you have a 1970s youngtimer, but you never know how easy is to deal with those 1970s four wheelers until you have a pre-war thing
my prewar R2 has a manual advance lever (the "frühzündung" lever) in the left handle bar, this means that you set the lever at no advance for starting the engine, and then while driving, as rpms increase, you need to advance ignition accordingly, and obviously when you reduce rpms you need to reduce advance too
the "frühzündung" lever wants to tell you all, but in fact tells you nothing as you have not been taught to set the lever in the minimum advance to start the engine, as you would have been if you were some 80 years old, (it is not the case) so you fiddle with it like a drunk bear in a parking lot
all "in toto" this is very comfortable (notice the false statement), yes, but again and back my question was, how to set iginition ?
oh, gosh ! i know that one,...in the car, you have two nice marks in the flywheel, the OT (for Top Dead Center) and the "ball" for 22 degrees BTDC (thus the advance at 1700 rpms), from there on, the distributor has two other ways to add advance automatically (cinetic and vacuum, both mechanical as you can see), and when you start the engine you simply turn the key and forget about the basics
the R2 is a bit less sophisticated, moreover less intuitive, and she has virtually NO marks in the flywheel, good girl !
so then you go to the manual, yeah, there is actually a manual, dated 1931, cool, but what ? it says nothing about it, except a nice diagram that among other issues has a marginal note: máximum advance 9,5mm, in perfect German (Frühzündung again), you may notice it or not,..."
...TBC
nos situamos, año 1934 R2 monocilindrica 200 cc
esto es un poco un compendio de lo aprendido durante varios años de miserias y andanzas en la oscuridad,...solo pretendiendo aportar lo experimentado
"you never know how easy is to drive and keep actual cars until you have a 1970s youngtimer, but you never know how easy is to deal with those 1970s four wheelers until you have a pre-war thing
my prewar R2 has a manual advance lever (the "frühzündung" lever) in the left handle bar, this means that you set the lever at no advance for starting the engine, and then while driving, as rpms increase, you need to advance ignition accordingly, and obviously when you reduce rpms you need to reduce advance too
the "frühzündung" lever wants to tell you all, but in fact tells you nothing as you have not been taught to set the lever in the minimum advance to start the engine, as you would have been if you were some 80 years old, (it is not the case) so you fiddle with it like a drunk bear in a parking lot
all "in toto" this is very comfortable (notice the false statement), yes, but again and back my question was, how to set iginition ?
oh, gosh ! i know that one,...in the car, you have two nice marks in the flywheel, the OT (for Top Dead Center) and the "ball" for 22 degrees BTDC (thus the advance at 1700 rpms), from there on, the distributor has two other ways to add advance automatically (cinetic and vacuum, both mechanical as you can see), and when you start the engine you simply turn the key and forget about the basics
the R2 is a bit less sophisticated, moreover less intuitive, and she has virtually NO marks in the flywheel, good girl !
so then you go to the manual, yeah, there is actually a manual, dated 1931, cool, but what ? it says nothing about it, except a nice diagram that among other issues has a marginal note: máximum advance 9,5mm, in perfect German (Frühzündung again), you may notice it or not,..."
...TBC
) que el encendido como bien dice 
), pero lo que digo es que es muy probable que está persona haya medido algún milímetro de menos/más con ese instrumento casero (me refiero a esos 9,5:mm de avance que mide con una varilla en una bujía agujereada ), yo tengo hecho uno muy similar y nunca estuve seguro de medir con tanta exactitud para poder decir 9.5 mm (o los que fueran de mi moto, que ahora no me acuerdo)
. El motor de mi matchless 500, de 1951, monocilindrica, de aspecto es muy similar al tuyo y la bujía también "entra" en diagonal, por eso escribí que YO nunca he estado seguro de lo correcto de mis mediciones.
