G3 505/D SLOW

Cam Yo /
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Picked up my first Sachs the other day and am experiencing a big lack of power/speed now that I’ve got it running. It’s a 79 G3, 9,500 miles with a 505/D and a bing 85/12/104.

What I’ve done so far:

1. Cleaned and rebuilt carb, fuel lines, in-line fuel filter.

2. Added new stock air filter.

3. Changed transmission fluid.

4. Checked wheel bearings.

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Problem:

Moped idles smoothly, and starts on a quarter kick. First test ride, accelerated quickly on flat ground, no issues.

Second ride, accelerated well at first and felt a noticeable shake/skip in the acceleration. Immediately stopped and brought back to garage. 3rd ride attempted to reach maximum speed, no “skips” or “shakes” but only managed to reach a top speed of 20mph on full throttle. Moped smokes like hell running and at idle. New to this motor and couldn’t find any clear answers after searching.

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