Decking the head and port tips? - Page 3

Tashka · 09-04-2018, 08:37 AM

Here yall go!

Tashka · 09-04-2018, 08:38 AM

i did a little more to the exhaust, and took a polishing bit to it aswell. My phone died and i wasn't able to get another picture, but it's pretty close.

Ariel Red Hunter · 09-04-2018, 09:46 AM

Quote:

Originally Posted by Tashka

i did a little more to the exhaust, and took a polishing bit to it aswell. My phone died and i wasn't able to get another picture, but it's pretty close.

I don't know if you know about replacing the "rag" head/exhaust pipe gasket with a copper o-ring type, but I recommend that you do...ARH

Tashka · 09-04-2018, 10:28 AM

i have done so! the stock one was in peices when I pulled it out

76firebird · 09-04-2018, 09:29 PM

I have a question related to the head porting. I hope it is ok to ask hear vs starting a new thread. I too would like to Port the head to pickup a little top end performance. I seen one on eBay for sale for around $50. I was thinking of getting it and doing the port work on it in case I mess it up my stock head would still be usable. I will add the eBay link. Could anyone tell me if it is the correct on for the hawk. My hawk is a 2018 if that makes a difference. Also does anyone have a link for the correct head gasket for the hawk. Thanks. https://rover.ebay.com/rover/0/0/0?m...2F292266378421

**JerryHawk250** · 09-04-2018, 09:57 PM

I don't remember the exact hole to hole dimensions so I can't say if that one will work or not. I do know the head for the CSC tt250 will work and the exhaust port is not as restrictive as the HAWK head. Also the head gasket for the tt250 will work.

76firebird · 09-04-2018, 10:02 PM

Thanks. I will look on there site

Tashka · 09-05-2018, 10:25 AM

the tt250 head gasket is thinner and will increase compression on the hawk. I did the math and my compression is 11.3:1 now

Azhule · 09-05-2018, 10:38 AM

Quote:

Originally Posted by Tashka

the tt250 head gasket is thinner and will increase compression on the hawk. I did the math and my compression is 11.3:1 now

Start planning on using higher octane/premium fuel (if you haven't already)

**JerryHawk250** · 09-05-2018, 10:49 AM

Quote:

Originally Posted by Azhule

Start planning on using higher octane/premium fuel (if you haven't already)

I second that.

And make sure you tuned the carb. Lean fuel mixture + high CR = Boom!

Azhule · 09-05-2018, 01:07 PM

Lean fuel mixture + high CR + Boom! = Brown undies that need replacing, along with most the engine

Finished the maths for you

**JerryHawk250** · 09-05-2018, 01:09 PM

Quote:

Originally Posted by Azhule

Lean fuel mixture + high CR + Boom! = Brown undies that need replacing, along with most the engine

Finished the maths for you

I re-adjusted my formula.

Tashka · 09-07-2018, 12:18 PM

my engine has been running pretty smoothly. I've been listening for knocking, but I've had none.

I think I'm gonna buy that performance cdi soon. try and get some more power out of it.

**JerryHawk250** · 09-07-2018, 01:35 PM

Be careful not to advance timing too much. With the higher compression ratio you don't really want to advance the timing. Besides most of those so called performance CDI's are worthless. If you do anything you will want a programable CDI that you can physically adjust the timing table. Only problem is the programable CDI is DC which means you will have to convert everything from AC to DC system.

Tashka · 09-07-2018, 06:34 PM

I thought the hawk electrical was DC?

09-04-2018, 09:57 PM	#36
JerryHawk250 Moderator Join Date: Oct 2016 Location: Houma, La. Posts: 11,707	I don't remember the exact hole to hole dimensions so I can't say if that one will work or not. I do know the head for the CSC tt250 will work and the exhaust port is not as restrictive as the HAWK head. Also the head gasket for the tt250 will work. __________________ 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
	1

09-05-2018, 01:07 PM	#41
Azhule Join Date: Dec 2015 Location: CO Posts: 1,525	Lean fuel mixture + high CR + Boom! = Brown undies that need replacing, along with most the engine Finished the maths for you __________________ "Think as you like... but this self proclaimed Professor is always right" - Buckshot "You never know what someone is hiding beneath their smile..." - NinjaTom - R.I.P.
	1

09-07-2018, 01:35 PM	#44
JerryHawk250 Moderator Join Date: Oct 2016 Location: Houma, La. Posts: 11,707	Be careful not to advance timing too much. With the higher compression ratio you don't really want to advance the timing. Besides most of those so called performance CDI's are worthless. If you do anything you will want a programable CDI that you can physically adjust the timing table. Only problem is the programable CDI is DC which means you will have to convert everything from AC to DC system. __________________ 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

09-04-2018, 08:38 AM	#32
Tashka Join Date: Aug 2018 Posts: 158	i did a little more to the exhaust, and took a polishing bit to it aswell. My phone died and i wasn't able to get another picture, but it's pretty close.
	0

09-04-2018, 10:28 AM	#34
Tashka Join Date: Aug 2018 Posts: 158	i have done so! the stock one was in peices when I pulled it out
	0

09-04-2018, 09:29 PM	#35
76firebird Join Date: Aug 2018 Posts: 14	I have a question related to the head porting. I hope it is ok to ask hear vs starting a new thread. I too would like to Port the head to pickup a little top end performance. I seen one on eBay for sale for around $50. I was thinking of getting it and doing the port work on it in case I mess it up my stock head would still be usable. I will add the eBay link. Could anyone tell me if it is the correct on for the hawk. My hawk is a 2018 if that makes a difference. Also does anyone have a link for the correct head gasket for the hawk. Thanks. https://rover.ebay.com/rover/0/0/0?m...2F292266378421
	0

09-04-2018, 10:02 PM	#37
76firebird Join Date: Aug 2018 Posts: 14	Thanks. I will look on there site
	0

09-05-2018, 10:25 AM	#38
Tashka Join Date: Aug 2018 Posts: 158	the tt250 head gasket is thinner and will increase compression on the hawk. I did the math and my compression is 11.3:1 now
	0

09-07-2018, 12:18 PM	#43
Tashka Join Date: Aug 2018 Posts: 158	my engine has been running pretty smoothly. I've been listening for knocking, but I've had none. I think I'm gonna buy that performance cdi soon. try and get some more power out of it.
	0

09-07-2018, 06:34 PM	#45
Tashka Join Date: Aug 2018 Posts: 158	I thought the hawk electrical was DC?
	0