Hawk 250 New piston and rings - Page 4

**JerryHawk250** · 01-31-2018, 03:20 PM

Quote:

Originally Posted by zach3697

After I torqued all the bolts down im getting 200 psi compression. Could it be so high from the assembly lube?

Thanks!

How much lube are you talking about? just a light coat on top the piston or like a real heavy layer?

zach3697 · 01-31-2018, 03:25 PM

Quote:

Originally Posted by JerryHawk250

How much lube are you talking about? just a light coat on top the piston or like a real heavy layer?

I used assembly lube which is basically a grease thats suppose to dissolve after you run it. Its a bit thicker then oil but I just put a coat on the cylinder wall and valves when I installed everything

**JerryHawk250** · 01-31-2018, 03:33 PM

Quote:

Originally Posted by zach3697

I used assembly lube which is basically a grease thats suppose to dissolve after you run it. Its a bit thicker then oil but I just put a coat on the cylinder wall and valves when I installed everything

200 psi seem high. should be around 175-180 psi. Did you measure the distance from the pin to top of piston to see if it was the same as the old piston?

zach3697 · 01-31-2018, 03:36 PM

Quote:

Originally Posted by JerryHawk250

200 psi is high seem high. should be around 175-180 psi. Did you measure the distance from the pin to top of piston to see if it was the same as the old piston?

Yes I measured the two and they were identical

**JerryHawk250** · 01-31-2018, 03:45 PM

Quote:

Originally Posted by zach3697

Yes I measured the two and they were identical

May be the assembly lube does have something to do with it. I know you didn't take that much off the head cleaning it. lol Hopefully it's just your gauge is off.

Megadan · 01-31-2018, 03:58 PM

Quote:

Originally Posted by zach3697

After I torqued all the bolts down im getting 200 psi compression. Could it be so high from the assembly lube?

Thanks!

Quite possible. Thick oil like assembly lube will stick and seal things up a little better. 200psi wouldn't alarm me at all on a fresh overhaul if I knew everything else was correct/set properly. Nice strong number.

**JerryHawk250** · 01-31-2018, 04:00 PM

Lets fire that baby up!

zach3697 · 01-31-2018, 04:07 PM

Quote:

Originally Posted by JerryHawk250

Lets fire that baby up!

Haha exactly what I plan on doing. At work right now but I'm going to try tomorrow to get the motor in and fire it up!

bogieboy · 01-31-2018, 04:21 PM

Agreed with Megadan.... 200 is good with grease/lube... when i did a new piston in my 200 without grease style lube (just motor oil) i saw 190....

Weldangrind · 02-01-2018, 10:11 AM

Did you have the throttle open or closed during the compression test?

zach3697 · 02-01-2018, 10:13 AM

Quote:

Originally Posted by Weldangrind

Did you have the throttle open or closed during the compression test?

I didnt have the carb on. I Just bolted the head on and did the compression test with open intake and exhaust

Weldangrind · 02-01-2018, 10:59 AM

That makes a difference. Imagine having the intake tube and carb installed with the throttle closed on the carb. It would draw very little air in that case, resulting in lower numbers. A wide open throttle (or in your case, no carb) allows the cylinder to grab as much air as will fill it. No exhaust also means that there is no back-pressure restriction, which also allows the cylinder to fill more completely. I think 200psi with no carb or exhaust sounds like a good number.

zach3697 · 02-02-2018, 12:42 PM

Well Today I got the motor back installed on the Hawk. Bolted everything except for the exhaust because I wanted to make sure it ran before I put it all back together. It didnt start at first but after some convincing i got it to start and idle. The video is below. The only issue is when I give it any throttle at all it dies. Im assuming its a carburetor issue that ill have to look at later but thats the update for now!

**JerryHawk250** · 02-02-2018, 01:22 PM

Sounds good. Once you have the exhaust and air box connected it should run better. Engine probably died because it hasn't warmed up enough.

Megadan · 02-02-2018, 02:24 PM

Put the exhaust on and then try to run it before assuming a carb problem. No exhaust at all will throw off the carb tuning, and it won't want to idle or run correctly.

01-31-2018, 04:00 PM	#52
JerryHawk250 Moderator Join Date: Oct 2016 Location: Houma, La. Posts: 11,553	Lets fire that baby up! __________________ 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
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02-01-2018, 10:11 AM	#55
Weldangrind Join Date: Mar 2009 Location: Sardis, BC, Canada Posts: 25,977	Did you have the throttle open or closed during the compression test? __________________ 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
	0

02-01-2018, 10:59 AM	#57
Weldangrind Join Date: Mar 2009 Location: Sardis, BC, Canada Posts: 25,977	That makes a difference. Imagine having the intake tube and carb installed with the throttle closed on the carb. It would draw very little air in that case, resulting in lower numbers. A wide open throttle (or in your case, no carb) allows the cylinder to grab as much air as will fill it. No exhaust also means that there is no back-pressure restriction, which also allows the cylinder to fill more completely. I think 200psi with no carb or exhaust sounds like a good number. __________________ 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
	2

02-02-2018, 01:22 PM	#59
JerryHawk250 Moderator Join Date: Oct 2016 Location: Houma, La. Posts: 11,553	Sounds good. Once you have the exhaust and air box connected it should run better. Engine probably died because it hasn't warmed up enough. __________________ 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
	1

02-02-2018, 02:24 PM	#60
Megadan Join Date: Apr 2017 Location: Omaha, NE Posts: 7,986	Put the exhaust on and then try to run it before assuming a carb problem. No exhaust at all will throw off the carb tuning, and it won't want to idle or run correctly. __________________ 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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01-31-2018, 04:21 PM	#54
bogieboy Join Date: May 2013 Location: finger lakes NY Posts: 2,044	Agreed with Megadan.... 200 is good with grease/lube... when i did a new piston in my 200 without grease style lube (just motor oil) i saw 190....
	2

02-02-2018, 12:42 PM	#58
zach3697 Join Date: Jan 2018 Posts: 43	Well Today I got the motor back installed on the Hawk. Bolted everything except for the exhaust because I wanted to make sure it ran before I put it all back together. It didnt start at first but after some convincing i got it to start and idle. The video is below. The only issue is when I give it any throttle at all it dies. Im assuming its a carburetor issue that ill have to look at later but thats the update for now!
	0