10-03-2023, 10:44 AM
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#1 |
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Join Date: Oct 2023
Posts: 2
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Help with ZS172FMM-3A Engine Measurements
I've been thinking of getting a ZS172FMM-3A engine to stick in my bike which uses a CG125 frame. I know the bottom mounts will be fine and the top may need a custom mount but I'm unsure if the exhaust will be blocked or if the drive sprocket will be stuck out too far.
Also I realise it doesn't have a balance shaft so I'm just wondering how bad the vibrations are. Niche questions so any light shedding will be appreciated. |
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10-03-2023, 11:10 AM
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#2 |
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Join Date: Oct 2016
Location: Carrollton, GA
Posts: 1,465
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Welcome to the Forum! There's an older page on this engine, and it looks like someone did a write-up on it. I haven't dug into anything on the link, but it might be a good place to start. Here's the link to the other page:
https://www.chinariders.net/showthread.php?t=29430
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First Rule of Aviation: -Never Pass Up The Opportunity to Pee I was struggling to get my wife's attention; I sat down on the couch and looked comfortable. That did the trick! My wife says I only have two faults. I don't listen and something else... If at first you don't succeed, try doing it the way I told you to... The Stable: 2005 Yamaha V-Star 650 - SOLD 2015 Suzuki DR 650 2015 RPS Hawk 250 - SOLD 2016 Ural Gear Up |
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10-03-2023, 11:12 AM
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#3 |
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Join Date: Oct 2016
Location: Carrollton, GA
Posts: 1,465
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Here's another link with some good information. Hope it helps!
https://www.advrider.com/f/threads/2...364671/page-14
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First Rule of Aviation: -Never Pass Up The Opportunity to Pee I was struggling to get my wife's attention; I sat down on the couch and looked comfortable. That did the trick! My wife says I only have two faults. I don't listen and something else... If at first you don't succeed, try doing it the way I told you to... The Stable: 2005 Yamaha V-Star 650 - SOLD 2015 Suzuki DR 650 2015 RPS Hawk 250 - SOLD 2016 Ural Gear Up |
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10-03-2023, 05:01 PM
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#5 |
Join Date: Aug 2020
Location: Australia
Posts: 1,320
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sprocket position should be fine. exhaust should still clear a center front frame post.
The biggest issue with the 172fmm is how wide the cylinder head/cam cover is and tank clearances. You might also have rear brake lever and foot peg width to engine case dimensions to adjust. |
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10-03-2023, 06:45 PM
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#6 |
Join Date: Feb 2021
Location: Kansas City
Posts: 2,404
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Regarding vibration, If you run high rpm highway use, it might be annoying, but otherwise, the "-3A" is an excellent engine. I don't even perceive vibrations from the motor in my off road jaunts. Getting there, I just take it easy, and I geared down, not up, so I don't go very fast
 But the engine starts EASY, has NICE low/midrange torque. Mine is mounted in the Templar X (1st version, 2022), with an enduro style frame. Just Tune the carb and it will make you happy. On the gas tank clearance, you can add a grommet or otherwise shim both front and rear to lift it up, if needed.
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-2022 5 speed Templar X Orange, OEM 51T rear sprocket, 14T front sprocket -NOS 2020 KTM 250SX (2-stroke motocross), less than 10 hours on it |
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10-03-2023, 09:18 PM
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#7 |
Join Date: Nov 2022
Location: Pennsyltuckey
Posts: 292
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22 Templar 250 |
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10-03-2023, 10:10 PM
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#8 |
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Join Date: Aug 2020
Location: Australia
Posts: 1,320
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Might aswell link the PR250 too, if the frame can clear the counterbalance case protrusion then it might be viable...same price...
looking at a cg125 frame i'd hazard a guess that both engines could squeeze in give or take some custom fab but no significant frame alterations... https://aj1moto.com/en-au/products/z...49fb5289&_ss=r |
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