Kv250r

johnd7169 · 08-05-2022, 03:38 AM

I’m helping a friend rebuild fix the top end of his engine. His chain busted cracked the case. He ran out low on oil overheated it a little and burnt the valve seals. It’s been smoking a little afterwards and we are breaking it dow right now.

Once I get all the parts in hopefully before this weekend I’ll get them installed. My main problem is I can not find the torque for the head nuts. The motor is a 166fmm (RE250) Loncin LX250GY-3 SX2.

I normally work on aircraft engines, air cooled or turbine. I normally have some sort of manual for finding torques. Maybe there are some standard torques for these head nuts. Any help would be appreciated

**JerryHawk250** · 08-05-2022, 07:39 AM

Torque specs from the Honda CRF230F should be close. Engines are very similar. https://www.google.com/url?q=https:/...MJxttHIYSQvu6B

johnd7169 · 08-11-2022, 05:47 AM

Thanks for the help. The info in the manual gave me comfort putting the motor back together.

08-05-2022, 03:38 AM	#1
johnd7169 Join Date: Apr 2022 Posts: 16	Kv250r I’m helping a friend rebuild fix the top end of his engine. His chain busted cracked the case. He ran out low on oil overheated it a little and burnt the valve seals. It’s been smoking a little afterwards and we are breaking it dow right now. Once I get all the parts in hopefully before this weekend I’ll get them installed. My main problem is I can not find the torque for the head nuts. The motor is a 166fmm (RE250) Loncin LX250GY-3 SX2. I normally work on aircraft engines, air cooled or turbine. I normally have some sort of manual for finding torques. Maybe there are some standard torques for these head nuts. Any help would be appreciated
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08-05-2022, 07:39 AM	#2
JerryHawk250 Moderator Join Date: Oct 2016 Location: Houma, La. Posts: 11,594	Torque specs from the Honda CRF230F should be close. Engines are very similar. https://www.google.com/url?q=https:/...MJxttHIYSQvu6B __________________ 2023 Lifan Lycan 250 Chopper 2023 Venom Evader 2022 Lifan KPX250 2020 Kawasaki Vulcan S (Sold) 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
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08-11-2022, 05:47 AM	#3
johnd7169 Join Date: Apr 2022 Posts: 16	Thanks for the help. The info in the manual gave me comfort putting the motor back together.
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