This engine is a vibrator. I just did a little search to see if anyone else has a shaker and someone on a mini-bike said the engine shakes a lot more than the blue 196cc clone. The only smooth zone is idle to off idle. I put a rubber pad under it and isolators below and it helped a lot but I am still annoyed. My only experience with the 196 is on gokarts and they were fine. I would avoid this engine. Look for the 196 unit instead. They are still available from different sources.