ChinaRiders Forums - View Single Post - ZS172-FMM-3A 249 to "300cc" kit

Thumper · 11-05-2022, 11:34 AM

That makes sense. 72 to 74 mm is not much! Then again, the bore/stroke is already oversquare. Maybe a subtle increase in piston diameter coupled with head porting and a timing advance will bump HP to 24 or 25. I wish we could find a resonator style open flow exhaust system that fits this engine. I will keep looking.

11-05-2022, 11:34 AM	#3
Thumper Join Date: Feb 2021 Location: Kansas City Posts: 2,388	That makes sense. 72 to 74 mm is not much! Then again, the bore/stroke is already oversquare. Maybe a subtle increase in piston diameter coupled with head porting and a timing advance will bump HP to 24 or 25. I wish we could find a resonator style open flow exhaust system that fits this engine. I will keep looking. Last edited by Thumper; 11-05-2022 at 12:26 PM.
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