I doubt a 300 will fit, but it might. Some YouTuber put a CBR300R engine on a Grom. So you never know.
Personally, I think the Sweet spot is between 175cc and 200cc.
You still get good fuel economy, especially if it's a higher compression engine, tuned well, but also a lot more torque and top speed than the 150.
I'm wondering if it was a plug and play, or did you need to weld any mounts?
From the space I see inside that bike, I probably would want a size smaller engine.
Quote:
Originally Posted by warrenpeas
... what should the operating temp be?
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Most engines run between 180 and 212F, this due to them being water cooled and 212F is the boiling Temperature of water.