My Hawk experience with a TT250 head on it.

Sochin · 07-07-2018, 01:37 AM

So last night I finished up putting on the TT250 head on my Hawk after a long an painful trial and error trying to extract a broken exhaust stud out of the head.

When the TT250 head came I could tell it's casting was much better than the original Hawk, so I thought wow.....don't need to port this puppy....and I did'nt feel like it. Instead I looked at the original exhaust (Yeah I'm cheap, still use it) So I saw some room for improvement right at the neck of the header pipe, I opened up that and improved flow by quite a lot.

Now today was the 1st time I got to stretch it's legs on the highway, a hill that is a mile from my home I only managed 50mph indicated going up with my 17/50 sprockets. Tonight it did 58mph uphill indicated, HUGE increase in torque low down and mid. It really gets up to 65Mph fast now and then peter out, so I think I can get use my 44 I've got in the rear finally.

So I can post great findings with a TT250 head and a mild ported stock exhaust (Punched out baffles a long time ago)

timcosby · 07-07-2018, 02:02 AM

now if you remove the cat it will really breath

Megadan · 07-07-2018, 02:55 AM

Remove the cat for sure. No matter how good the TT250 head is, it can still benefit from port work. The results might be less dramatic but they would still be noticeable with the right carb and exhaust setup.

It is also a shame there couldn't be a comparison of just opening up the stock header pipe welds on the factory head. Between the weld intrusions at the flange and the cat, you can probably account for the majority of gains seen when installing the afternarket systems in place of the stock one.

P.S. You should include the pictures you took of the TT250 head for the other guys to see.

Ariel Red Hunter · 07-07-2018, 09:35 AM

Quote:

Originally Posted by Sochin

So last night I finished up putting on the TT250 head on my Hawk after a long an painful trial and error trying to extract a broken exhaust stud out of the head.

When the TT250 head came I could tell it's casting was much better than the original Hawk, so I thought wow.....don't need to port this puppy....and I did'nt feel like it. Instead I looked at the original exhaust (Yeah I'm cheap, still use it) So I saw some room for improvement right at the neck of the header pipe, I opened up that and improved flow by quite a lot.

Now today was the 1st time I got to stretch it's legs on the highway, a hill that is a mile from my home I only managed 50mph indicated going up with my 17/50 sprockets. Tonight it did 58mph uphill indicated, HUGE increase in torque low down and mid. It really gets up to 65Mph fast now and then peter out, so I think I can get use my 44 I've got in the rear finally.

So I can post great findings with a TT250 head and a mild ported stock exhaust (Punched out baffles a long time ago)

Thank you. Very valuable information. ...ARH

**JerryHawk250** · 07-07-2018, 09:40 AM

Remove the catalytic converter and you will see a big improvement.

Sochin · 07-07-2018, 11:54 AM

I'll probably end up buying a full exhaust from flea bay/amazon when the times comes. But I'm excited about the wast improvement I got from the little I did. So these engines definitely has some potential still left in them, I guess the gamble will be a balance between reliability and output?

I'll post pictures of the TT250 head as soon as my google account has synced my phone up.

Essayons · 07-07-2018, 01:01 PM

How will porting, cat removal, improved exhaust and best carb set up affect fuel consumption?

**JerryHawk250** · 07-07-2018, 01:34 PM

Quote:

Originally Posted by Essayons

How will porting, cat removal, improved exhaust and best carb set up affect fuel consumption?

Hasn't hurt my fuel economy. 63 to 67 mpg

Weldangrind · 07-07-2018, 01:42 PM

Quote:

Originally Posted by Essayons

How will porting, cat removal, improved exhaust and best carb set up affect fuel consumption?

In my case, fuel economy suffered. That's because I can't stop myself from grabbing a handful of throttle every time I shift. The grin factor has gone way up.

Sochin · 07-07-2018, 01:42 PM

TT250 head photos

https://photos.app.goo.gl/prcfUmTceBzhKxtS7

https://photos.app.goo.gl/FeuBQEkdsvauqKRH8

https://photos.app.goo.gl/9s7TjBUVmywHrQoD6

Block off plate made for air-injection port on TT250 head (Not present on Hawk 250 head).

https://photos.app.goo.gl/Sk7iJR2zxvGUfWmZ7

Ariel Red Hunter · 07-07-2018, 02:05 PM

Quote:

Originally Posted by Essayons

How will porting, cat removal, improved exhaust and best carb set up affect fuel consumption?

Improved thermodynamics should result in improved fuel economy - AT THE SAME SPEED - however, most of us have trouble restraining the right wrist from turning the loud handle UP!...ARH

Gh426 · 07-07-2018, 03:04 PM

I would love to see someone create an Arduino based $25 water-methanol kit that will work on that plated off injection port. Cooling & Mo Power in one SHOT!

Megadan · 07-07-2018, 08:28 PM

Quote:

Originally Posted by Gh426

I would love to see someone create an Arduino based $25 water-methanol kit that will work on that plated off injection port. Cooling & Mo Power in one SHOT!

You would end up with a very clean exhaust pipe and nothing more. That port goes directly into the exhaust.

Cravin01 · 07-07-2018, 09:39 PM

Funny but I will give up MPG for WHP PDQ!!!! especially when your talking 60+

More Gas! More Air! ......More Fun!

roundhouse · 07-08-2018, 09:01 PM

Cool experiment. Thanks for sharing.

07-07-2018, 01:37 AM	#1
Sochin Join Date: Jul 2017 Location: Montucky Posts: 209	My Hawk experience with a TT250 head on it. So last night I finished up putting on the TT250 head on my Hawk after a long an painful trial and error trying to extract a broken exhaust stud out of the head. When the TT250 head came I could tell it's casting was much better than the original Hawk, so I thought wow.....don't need to port this puppy....and I did'nt feel like it. Instead I looked at the original exhaust (Yeah I'm cheap, still use it) So I saw some room for improvement right at the neck of the header pipe, I opened up that and improved flow by quite a lot. Now today was the 1st time I got to stretch it's legs on the highway, a hill that is a mile from my home I only managed 50mph indicated going up with my 17/50 sprockets. Tonight it did 58mph uphill indicated, HUGE increase in torque low down and mid. It really gets up to 65Mph fast now and then peter out, so I think I can get use my 44 I've got in the rear finally. So I can post great findings with a TT250 head and a mild ported stock exhaust (Punched out baffles a long time ago) __________________ 1983 Honda Xl600R 2016 Ducati Multistrada 1200S DVT
	5

07-07-2018, 02:02 AM	#2
timcosby Join Date: Nov 2016 Location: robertsdale alabama usa Posts: 1,007	now if you remove the cat it will really breath __________________ 1991 harley heritage softail classic 2016 hawk kaw h1 400 tripple 13' long chopper in progress 2009 johnny pag bar hog 2004 hd electra glide ultra classic shriner edition 1997 harley davidson 1200 sportster 1972 harley davidson amf sx250
	0

07-07-2018, 02:55 AM	#3
Megadan Join Date: Apr 2017 Location: Omaha, NE Posts: 8,110	Remove the cat for sure. No matter how good the TT250 head is, it can still benefit from port work. The results might be less dramatic but they would still be noticeable with the right carb and exhaust setup. It is also a shame there couldn't be a comparison of just opening up the stock header pipe welds on the factory head. Between the weld intrusions at the flange and the cat, you can probably account for the majority of gains seen when installing the afternarket systems in place of the stock one. P.S. You should include the pictures you took of the TT250 head for the other guys to see. __________________ 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
	2

07-07-2018, 09:40 AM	#5
JerryHawk250 Moderator Join Date: Oct 2016 Location: Houma, La. Posts: 11,737	Remove the catalytic converter and you will see a big improvement. __________________ 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

07-07-2018, 11:54 AM	#6
Sochin Join Date: Jul 2017 Location: Montucky Posts: 209	I'll probably end up buying a full exhaust from flea bay/amazon when the times comes. But I'm excited about the wast improvement I got from the little I did. So these engines definitely has some potential still left in them, I guess the gamble will be a balance between reliability and output? I'll post pictures of the TT250 head as soon as my google account has synced my phone up. __________________ 1983 Honda Xl600R 2016 Ducati Multistrada 1200S DVT
	1

07-07-2018, 01:01 PM	#7
Essayons Join Date: Mar 2018 Location: fontana, california Posts: 333	How will porting, cat removal, improved exhaust and best carb set up affect fuel consumption?
	0

07-07-2018, 01:42 PM	#10
Sochin Join Date: Jul 2017 Location: Montucky Posts: 209	TT250 head photos https://photos.app.goo.gl/prcfUmTceBzhKxtS7 https://photos.app.goo.gl/FeuBQEkdsvauqKRH8 https://photos.app.goo.gl/9s7TjBUVmywHrQoD6 Block off plate made for air-injection port on TT250 head (Not present on Hawk 250 head). https://photos.app.goo.gl/Sk7iJR2zxvGUfWmZ7 __________________ 1983 Honda Xl600R 2016 Ducati Multistrada 1200S DVT
	1

07-07-2018, 03:04 PM	#12
Gh426 Join Date: Feb 2018 Location: LA Posts: 74	I would love to see someone create an Arduino based $25 water-methanol kit that will work on that plated off injection port. Cooling & Mo Power in one SHOT!
	1

07-07-2018, 09:39 PM	#14
Cravin01 Join Date: Jan 2018 Location: Forney Texas Posts: 498	Funny but I will give up MPG for WHP PDQ!!!! especially when your talking 60+ More Gas! More Air! ......More Fun! __________________ Visit me on YouTube at "Project Next"! https://www.youtube.com/channel/UC6KTCi2GVbfRDv-2XCqHhsg?view_as=subscriber 2017 Bashan Storm Keihen PZ30 Pumper Carb,115 main jet,35 pilot jet, gutted factory exhaust, Sambo Digital Speedometer,LED blinkers, H4 headlight,D.I.D X-ring chain 428,17/42 sprockets,UNI cone filter.
	1

07-08-2018, 09:01 PM	#15
roundhouse Join Date: Sep 2017 Location: N Texas Posts: 706	Cool experiment. Thanks for sharing.
	0