Compression Ratio for a 125 CC ?

Robert M. Williams · 02-12-2019, 02:30 PM

What should the Compression be for a 125 CC ATV

Weldangrind · 02-12-2019, 11:39 PM

My guess is that 130 is a good number. Are you having running problems?

**JerryHawk250** · 02-13-2019, 09:26 AM

Should be around 145-170 psi. If you think it has low compression it may just be that the valves are to tight and need adjusting.
Here's a link to a service manual. http://www.google.com/url?sa=t&rct=j...Sbkg3xQw6Y2pZ7

02-12-2019, 02:30 PM	#1
Robert M. Williams Join Date: Feb 2019 Posts: 1	Compression Ratio for a 125 CC ? What should the Compression be for a 125 CC ATV
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02-12-2019, 11:39 PM	#2
Weldangrind Join Date: Mar 2009 Location: Sardis, BC, Canada Posts: 25,977	My guess is that 130 is a good number. Are you having running problems? __________________ Weldangrind "I figure I'm well-prepared for coping with a bike that comes from the factory with unresolved issues and that rewards the self-reliant owner." - Buccaneer
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02-13-2019, 09:26 AM	#3
JerryHawk250 Moderator Join Date: Oct 2016 Location: Houma, La. Posts: 11,571	Should be around 145-170 psi. If you think it has low compression it may just be that the valves are to tight and need adjusting. Here's a link to a service manual. http://www.google.com/url?sa=t&rct=j...Sbkg3xQw6Y2pZ7 __________________ 2023 Lifan Lycan 250 Chopper 2023 Venom Evader 2022 Lifan KPX250 2020 Kawasaki Vulcan S 2004 Honda ST 1300 2016 Black Hawk 250 (sold) Keihin PE30 carb,125 main,38 slow.Pod filter,ported & decked head 10:1 CR,Direct Ignition Coil,15/40Sprockets,NGK DPR8EIX-9,De-Cat,Dual Oil Cooler,Digital Cluster 2016 Cazador180 XL 2014 Coolster150 JerryHawk250.com My YouTube Channel Last edited by JerryHawk250; 02-13-2019 at 11:08 AM.
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