CG250 Head - A Closer Look. - Page 3

Dieselrunner · 08-08-2017, 07:26 PM

Dan, have you made any "head way" on this?

Megadan · 08-08-2017, 11:05 PM

Quote:

Originally Posted by Dieselrunner

Dan, have you made any "head way" on this?

Nah, I don't have my head in the game yet. I am too busy trying to get ahead in other projects, and I just can't get enough flow at the moment.

I will be starting on it here soon though if time permits.

Weldangrind · 08-09-2017, 12:30 PM

Quote:

Originally Posted by Megadan

Nah, I don't have my head in the game yet. I am too busy trying to get ahead in other projects, and I just can't get enough flow at the moment.

Boo.

pistolclass · 08-09-2017, 01:27 PM

I see where this is heading. Please don't lash out at my post.

**JerryHawk250** · 10-30-2017, 01:02 PM

I need to stop reading this stuff. Its got me thinking about getting another head to start playing around with. Besides the port and polishing I'm thinking about decking the head to get the compression ratio up o about 9.5:1. this should gain at least 2 hp minimum. My oldest brother runs a machine shop so the machine work to deck the head isn't a problem. He's a motor head too so won't take much to convince him to get it done for free. lol

Weldangrind · 10-30-2017, 01:40 PM

Do it! With resources like that, what's stopping you?

**JerryHawk250** · 11-02-2017, 09:52 PM

Anyone want to donate a head for the sake of valuable research? Anyone? Anyone? Lol. Cheapest I have found is about $55 and not as easy to find as piston and cylinders.

kirbo7106 · 11-03-2017, 12:47 AM

Quote:

Originally Posted by JerryHawk250

I need to stop reading this stuff. Its got me thinking about getting another head to start playing around with. Besides the port and polishing I'm thinking about decking the head to get the compression ratio up o about 9.5:1. this should gain at least 2 hp minimum. My oldest brother runs a machine shop so the machine work to deck the head isn't a problem. He's a motor head too so won't take much to convince him to get it done for free. lol

I feel the same way! I start watching the videos and reading the posts, next thing you know, I’m buying levers, exhaust, carbs and now tires!

Megadan · 11-03-2017, 05:12 AM

If you do plan on buying a head, then make sure to measure the distance between the Head/Cylinder bolts. Supposedly there are minor variations in this pattern between some manufacturers of this engine, so not all of them will match up. I managed to do mine with calipers and the valve cover removed. Was a little annoying trying to get an accurate set of numbers, but doable.

**JerryHawk250** · 11-03-2017, 08:41 AM

Quote:

Originally Posted by Megadan

If you do plan on buying a head, then make sure to measure the distance between the Head/Cylinder bolts. Supposedly there are minor variations in this pattern between some manufacturers of this engine, so not all of them will match up. I managed to do mine with calipers and the valve cover removed. Was a little annoying trying to get an accurate set of numbers, but doable.

Since you done all the dirty work would you be willing to share those dimensions or post a link to the one you got. This is the one I found. http://www.motopartsmax.com/index.ph.../2/cPath/21_85

Megadan · 11-03-2017, 05:57 PM

Quote:

Originally Posted by JerryHawk250

Since you done all the dirty work would you be willing to share those dimensions or post a link to the one you got. This is the one I found. http://www.motopartsmax.com/index.ph.../2/cPath/21_85

I wrote it down somewhere, but when I get home I can definitely try to search for it or dig the head out.

**JerryHawk250** · 11-03-2017, 05:58 PM

Quote:

Originally Posted by Megadan

I wrote it down somewhere, but when I get home I can definitely try to search for it or dig the head out.

Much appreciated.

Megadan · 11-04-2017, 06:07 AM

Well, since my recent storage space into garage move, the notebook I write my numbers down on is buried or misplaced, so instead of measuring my current head, I would rather try to re-measure the stock head and post those numbers.

It's not too much work to pull the rocker assemblies anyway, so removing the fuel tank too will give me a much better view.

**JerryHawk250** · 11-07-2017, 09:30 AM

I wonder if there is enough room to pull the head without removing the engine from the frame? I might wait till the weather turns to crap and just pull and port the stock head.

Megadan · 11-07-2017, 03:04 PM

For the head only, there is likely just enough room if you can get the head bolts out.

Sorry I haven't gotten around to the bolt spacing yet. I wound up taking all day fixing my Jeep, and then ended up back at work all week. I am going to TRY and get around to it this coming weekend.

10-30-2017, 01:02 PM	#35
JerryHawk250 Moderator Join Date: Oct 2016 Location: Houma, La. Posts: 11,721	I need to stop reading this stuff. Its got me thinking about getting another head to start playing around with. Besides the port and polishing I'm thinking about decking the head to get the compression ratio up o about 9.5:1. this should gain at least 2 hp minimum. My oldest brother runs a machine shop so the machine work to deck the head isn't a problem. He's a motor head too so won't take much to convince him to get it done for free. lol __________________ 2024 Linhai 300 ATV 4x4 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 Last edited by JerryHawk250; 10-31-2017 at 08:33 AM.
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10-30-2017, 01:40 PM	#36
Weldangrind Join Date: Mar 2009 Location: Sardis, BC, Canada Posts: 25,977	Do it! With resources like that, what's stopping you? __________________ 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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11-02-2017, 09:52 PM	#37
JerryHawk250 Moderator Join Date: Oct 2016 Location: Houma, La. Posts: 11,721	Anyone want to donate a head for the sake of valuable research? Anyone? Anyone? Lol. Cheapest I have found is about $55 and not as easy to find as piston and cylinders. __________________ 2024 Linhai 300 ATV 4x4 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
	0

11-03-2017, 05:12 AM	#39
Megadan Join Date: Apr 2017 Location: Omaha, NE Posts: 8,110	If you do plan on buying a head, then make sure to measure the distance between the Head/Cylinder bolts. Supposedly there are minor variations in this pattern between some manufacturers of this engine, so not all of them will match up. I managed to do mine with calipers and the valve cover removed. Was a little annoying trying to get an accurate set of numbers, but doable. __________________ 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
	0

11-04-2017, 06:07 AM	#43
Megadan Join Date: Apr 2017 Location: Omaha, NE Posts: 8,110	Well, since my recent storage space into garage move, the notebook I write my numbers down on is buried or misplaced, so instead of measuring my current head, I would rather try to re-measure the stock head and post those numbers. It's not too much work to pull the rocker assemblies anyway, so removing the fuel tank too will give me a much better view. __________________ 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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08-08-2017, 07:26 PM	#31
Dieselrunner Join Date: Mar 2017 Location: Kentucky Posts: 34	Dan, have you made any "head way" on this?
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08-09-2017, 01:27 PM	#34
pistolclass Join Date: Oct 2015 Location: connecticut Posts: 980	I see where this is heading. Please don't lash out at my post.
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11-07-2017, 09:30 AM	#44
JerryHawk250 Moderator Join Date: Oct 2016 Location: Houma, La. Posts: 11,721	I wonder if there is enough room to pull the head without removing the engine from the frame? I might wait till the weather turns to crap and just pull and port the stock head. __________________ 2024 Linhai 300 ATV 4x4 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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11-07-2017, 03:04 PM	#45
Megadan Join Date: Apr 2017 Location: Omaha, NE Posts: 8,110	For the head only, there is likely just enough room if you can get the head bolts out. Sorry I haven't gotten around to the bolt spacing yet. I wound up taking all day fixing my Jeep, and then ended up back at work all week. I am going to TRY and get around to it this coming weekend. __________________ 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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