Hawk HP?

Gryffon2013 · 09-03-2018, 11:06 PM

I'm curious. How much HP does a factory hawk have? Seems every seller I look at lists a different HP rating for the hawk starting at 10.5 and some going up to almost 15. A 50% increase in power is pretty significant.

Anyone dyno their bike after their mods?

Azhule · 09-04-2018, 12:35 AM

10.5 kW maybe ?

pete · 09-04-2018, 04:03 AM

Quote:

Originally Posted by Azhule

10.5 kW maybe ?

yep...

KW x 1.341 = HP

..

Gryffon2013 · 09-04-2018, 07:34 AM

Lol! OK thanks guys, I never even thought about the possibility of someone mistakenly listing kW as HP rating. I though 10 HP seemed a little low for an engine this size

Johnthehawkguy · 11-06-2018, 06:16 PM

I did mine. It only made 9.6 hp at the rear wheel stock. Made 15.2 when i was done.

Sport Rider · 11-07-2018, 09:23 AM

Quote:

Originally Posted by Johnthehawkguy

I did mine. It only made 9.6 hp at the rear wheel stock. Made 15.2 when i was done.

that's quite a jump. what changes did you make?

Johnthehawkguy · 11-07-2018, 08:43 PM

I cleaned the exhaust out, ported the head and a three angle valve job. Milled the head. Tuned the carb on the dyno.

NzBrakelathes · 11-07-2018, 08:48 PM

Almost better to just add in the 249cc CB over head cam engine
Stock 15 Kw 18 Nm torque

Azhule · 11-08-2018, 11:58 AM

Quote:

Originally Posted by NzBrakelathes

Almost better to just add in the 249cc CB over head cam engine
Stock 15 Kw 18 Nm torque

Are those numbers "at the wheel" with all the other parasitic loses down the line after the engine?

I see some places like to "fudge" the high numbers a bit and just have the engine directly bolted to a machine to see how much hp/kw it makes... a 15kw engine can easily drop down to 10kw "at the wheel" when you add those "parasitic loses", things like the transmission, sprockets, gearing, chain, and wheel can eat up a good amount of power

Sport Rider · 11-08-2018, 12:09 PM

Quote:

Originally Posted by NzBrakelathes

Almost better to just add in the 249cc CB over head cam engine
Stock 15 Kw 18 Nm torque

15 kw is about the same as the hawk 229, isn't it? that converts to about 15 hp....which is likely at the motor?

2LZ · 11-08-2018, 12:20 PM

Quote:

Originally Posted by Johnthehawkguy

I cleaned the exhaust out, ported the head and a three angle valve job. Milled the head. Tuned the carb on the dyno.

Nice to see some dyno work going on here again. Thanks!
The last one was a Qlink, years ago.

Johnthehawkguy · 11-08-2018, 05:17 PM

That's a t the rear wheel.

pete · 11-08-2018, 11:17 PM

Quote:

Originally Posted by Johnthehawkguy

I did mine. It only made 9.6 hp at the rear wheel stock. Made 15.2 when i was done.

there is on avarage a 20% loss in the power train...

..

Megadan · 11-09-2018, 01:14 AM

The official Hawk 250 rating is 14.1hp@7000rpm from RPS completely stock with it's too lean carb jetting and silly restrictive exhaust. I could easily believe 10whp on an unmodded bike. With proper carb jetting, around 15 - 16hp isn't too unrealistic. Take care of the two biggest restrictions - head ports and the exhaust, and 18-19hp on a 26mm venturi carb is right int he ballpark. With a 30mm carb you should be right around 20hp or so, depending on factors. This is all crank hp numbers, but not unrealistic ones.

Johnthehawkguy · 11-09-2018, 02:55 PM

Yeah i can convert it to motor hp. It say it 18.1 hp

09-03-2018, 11:06 PM	#1
Gryffon2013 Join Date: Aug 2018 Posts: 6	Hawk HP? I'm curious. How much HP does a factory hawk have? Seems every seller I look at lists a different HP rating for the hawk starting at 10.5 and some going up to almost 15. A 50% increase in power is pretty significant. Anyone dyno their bike after their mods?
	0

09-04-2018, 12:35 AM	#2
Azhule Join Date: Dec 2015 Location: CO Posts: 1,525	10.5 kW maybe ? __________________ "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

11-06-2018, 06:16 PM	#5
Johnthehawkguy Join Date: Oct 2018 Posts: 6	Dyno I did mine. It only made 9.6 hp at the rear wheel stock. Made 15.2 when i was done.
	3

11-07-2018, 08:43 PM	#7
Johnthehawkguy Join Date: Oct 2018 Posts: 6	Dyno I cleaned the exhaust out, ported the head and a three angle valve job. Milled the head. Tuned the carb on the dyno.
	1

11-09-2018, 01:14 AM	#14
Megadan Join Date: Apr 2017 Location: Omaha, NE Posts: 8,030	The official Hawk 250 rating is 14.1hp@7000rpm from RPS completely stock with it's too lean carb jetting and silly restrictive exhaust. I could easily believe 10whp on an unmodded bike. With proper carb jetting, around 15 - 16hp isn't too unrealistic. Take care of the two biggest restrictions - head ports and the exhaust, and 18-19hp on a 26mm venturi carb is right int he ballpark. With a 30mm carb you should be right around 20hp or so, depending on factors. This is all crank hp numbers, but not unrealistic ones. __________________ 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

09-04-2018, 07:34 AM	#4
Gryffon2013 Join Date: Aug 2018 Posts: 6	Lol! OK thanks guys, I never even thought about the possibility of someone mistakenly listing kW as HP rating. I though 10 HP seemed a little low for an engine this size
	0

11-07-2018, 08:48 PM	#8
NzBrakelathes Join Date: Jun 2016 Location: Hell Posts: 2,408	Almost better to just add in the 249cc CB over head cam engine Stock 15 Kw 18 Nm torque
	1

11-08-2018, 05:17 PM	#12
Johnthehawkguy Join Date: Oct 2018 Posts: 6	That's a t the rear wheel.
	1

11-09-2018, 02:55 PM	#15
Johnthehawkguy Join Date: Oct 2018 Posts: 6	Yeah i can convert it to motor hp. It say it 18.1 hp
	0