Just put a 24 Tooth sprocket on my OCC Pacific. I bought it last year at 1977 Mopeds in Kalamazoo. I did have the 44 Tooth on and it gave good performance for accelleration but I have joined a moped gang in K.C. the Breakfast Mafia and its no good getting left, struggling to keep up with the engine screaming its lungs out. The routes that I had ridden with them didn't feature many hills so I figured I was good. First starting takes a another ten feet average as a higher speed is required before engageing the clutch. The accelleration is also slower but can be compensated for by pedalling, keeping me with the pack. Top speed puts me right up front racing with the fastest mopeds which is a rush. Though I currently have to back off before stoplights due to lower braking capacity. Then the bad news, starting at the bottom of hills from a stop is not for those who cannot Armstrong their way to the top, the 49cc and 24 Tooth is not for hilly areas. The last Sunday weekly ride with the B-Mafia had a couple of long hills, one I pedalled, the other I walked (wishing for more cc's) .The engine is quite comfortable with the sprocket under normal conditions, at top speed the engine doesn't rap out but instead seems to keep gaining with the power band starting at about 20 mph. I'll have more accurate speed data when I get the speedo hooked up. Note:the wider rear sprocket required use of a 40-1 x 10ft (5ft of it)roller chain Farmex #06401 which kinked alot initially on the front sprocket but worked fine.