Sachs 5051b kits

Roger Chave /
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Hello everybody,

New member, and “new“ moped!

I've recently picked up an early 80's Sachs Seville with the 5051b engine and would like to get a little more out of it. From what I’ve read the 5051b is pretty much the wimpiest of the 505 motors and I’ve seen the Athena 70cc kits and figured that’d be plenty of power for my moped.

Are these kits pretty much universal between the various 505 engines, or will I need to possibly swap out the crank as well? Are the kits worth the money, or should I just look for a used A,C, or D engine? Or would just putting on a 12mm carb(came with a 10mm), better exhaust, and rear sprocket be enough to make a difference?

I’m don’t really need to hit 40mph or anything, I’d just like to get a little more pull when I hit a slight incline.

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