- May 21, 2014
These engines need an extensive break-in period using a fairly rich fuel oil mix of about 25:1, for a couple hundred miles. At least that's how I broke in my 48cc, and it's now coming into it's own. Initially it would be hard pressed to make near 20 mph when new, but it also had a big gasket restriction in the intake manifold to cylinder connection. That problem was easily fixed with a home-made manila folder gasket and a couple 3/16" holes drilled through the exhaust muffler cap pipe internal section. You shouldn't need to pedal assist at all on level ground with no wind.No, no special gearing. Just the standard sprocket. I adjusted the carb today, revs much higher (sounds normal) but after it heats up it needs to cool again before it will rev high. Every time I ride it this gets better, today it held 20 mph without my pedal assist. Maybe it just needs more miles?
That your engine is overheating when taking long runs is a concern, I'd be checking the carb to manifold joint for the O-ring or at least buy a new one if the stock one is creased or damaged.