ChinaRiders Forums - View Single Post

Nutcracker · 04-01-2022, 08:20 AM

Motor is a true 249.9 CC. Absolutely Honda inspired but not a direct clone. Appears there a 3 models for the engine. Possibly the bottom end is same and just top end bore & stroke increases from 66mm to 72 mm.. But I don't even think that's the case each model has some unique differences. ZS166FMM, ZS169FMM & ZS172FMM. This engine is the ZS172FMM3-A basically a non counterbalanced 5 speed. The newest GPX, RCB, FSE, Kayo etc has the ZS172FMM-5 (PR250). Its Zongshen made, counter balanced and has six gears. Other Forums specs say the newest engine has less vibrations, but also less power and torque. Power is about 1.5-2 hp less than traditional 172FMM. Joe Henner Motorsports has several post and upgrades that I'm researching. I would love to put a 4° flywheel key in this motor to see the actual difference..

04-01-2022, 08:20 AM	#50
Nutcracker Join Date: Mar 2022 Posts: 107	Motor is a true 249.9 CC. Absolutely Honda inspired but not a direct clone. Appears there a 3 models for the engine. Possibly the bottom end is same and just top end bore & stroke increases from 66mm to 72 mm.. But I don't even think that's the case each model has some unique differences. ZS166FMM, ZS169FMM & ZS172FMM. This engine is the ZS172FMM3-A basically a non counterbalanced 5 speed. The newest GPX, RCB, FSE, Kayo etc has the ZS172FMM-5 (PR250). Its Zongshen made, counter balanced and has six gears. Other Forums specs say the newest engine has less vibrations, but also less power and torque. Power is about 1.5-2 hp less than traditional 172FMM. Joe Henner Motorsports has several post and upgrades that I'm researching. I would love to put a 4° flywheel key in this motor to see the actual difference..
	0