HAWK 250 Warm Engine hard to start "Sometimes" ??? - Page 2

SecondHandHawk · 09-29-2019, 12:03 AM

Hi all.
My hawk is used and a project in work.
Was wondering if anyone knew what the actual compression of the hawk 250 is supposed to be.
My valves are set correctly. The motor runs great and reliable. But I suspect some compression loss/blow by

I have read other older threads but no one replied to my comment. One past reply stated 170-180 psi.

Thanks for any info.

Megadan · 09-29-2019, 01:04 AM

There is no official number, but the CG125 that this motor is based off of ran the same basic compression ratio and Honda states 170psi. Give it a bit of leeway for obvious potential variables and 160-170psi is going to be good. Anything 120psi or over means it will run fairly healthy, and 100psi or less - bad. This is a cold test with the throttle wide open.

SecondHandHawk · 09-29-2019, 02:22 AM

Thank you for the fast reply.
Thanks for the info about cold check and WOT.

I'll check mine tomorrow afternoon.

09-29-2019, 01:04 AM	#17
Megadan Join Date: Apr 2017 Location: Omaha, NE Posts: 8,064	There is no official number, but the CG125 that this motor is based off of ran the same basic compression ratio and Honda states 170psi. Give it a bit of leeway for obvious potential variables and 160-170psi is going to be good. Anything 120psi or over means it will run fairly healthy, and 100psi or less - bad. This is a cold test with the throttle wide open. __________________ Hawk Information and Resource guide: http://www.chinariders.net/showthread.php?t=20331 2018 Hawk 250 - Full Mod list here. http://www.chinariders.net/showpost....62&postcount=1 2024 Royal Enfield Shotgun 650 https://chinariders.net/showthread.php?t=34124
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09-29-2019, 12:03 AM	#16
SecondHandHawk Join Date: Jul 2019 Location: Arkansas Posts: 11	Hi all. My hawk is used and a project in work. Was wondering if anyone knew what the actual compression of the hawk 250 is supposed to be. My valves are set correctly. The motor runs great and reliable. But I suspect some compression loss/blow by I have read other older threads but no one replied to my comment. One past reply stated 170-180 psi. Thanks for any info.
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09-29-2019, 02:22 AM	#18
SecondHandHawk Join Date: Jul 2019 Location: Arkansas Posts: 11	Thank you for the fast reply. Thanks for the info about cold check and WOT. I'll check mine tomorrow afternoon.
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