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

Thumper · 11-05-2022, 10:33 AM

I found this kit on AliExpress for $125. It is calling it a 300cc kit. The bore is increased from 72 to 74mm. I think it is probably 280cc, but I'LL TAKE IT!

This kit will probably fit the 6 speed engine (ZS172-FMM-5), but I am going to try it on the 5 speed engine. I need to find an advance key for the timing as well. I haven't been able to find a NC250 style resonator exhaust for this engine. The one made for the NC (water cooled engine) probably won't fit right.

This seems like a perfect Winter project:

Name: ZONGSHEN-CB250F-250cc-to-300cc-74mm.jpg
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Name: ZONGSHEN-CB250F-250cc-to-300cc-74mm.jpg
Views: 618
Size: 69.2 KB

11-05-2022, 10:33 AM	#1
Thumper Join Date: Feb 2021 Location: Kansas City Posts: 2,331	ZS172-FMM-3A 249 to "300cc" kit I found this kit on AliExpress for $125. It is calling it a 300cc kit. The bore is increased from 72 to 74mm. I think it is probably 280cc, but I'LL TAKE IT! This kit will probably fit the 6 speed engine (ZS172-FMM-5), but I am going to try it on the 5 speed engine. I need to find an advance key for the timing as well. I haven't been able to find a NC250 style resonator exhaust for this engine. The one made for the NC (water cooled engine) probably won't fit right. This seems like a perfect Winter project:
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