Hawk CG engine bore and stroke????

mjstef · 03-15-2017, 12:16 AM

Working with a supplier for the oil coolers and may have found a big bore kit. No promises but MAYBE! What is the stock bore and stroke??

old kid · 03-15-2017, 12:46 AM

this is all the info that is in the owners manual

ughmas · 03-15-2017, 12:50 AM

not sure if they are exactly the same or if it makes a difference but the TT250 service manual lists

Bore x Stroke 66.5mm x 66.2mm

mjstef · 03-15-2017, 12:54 AM

I have found a cylinder with a 70mm bore. Still confirming with manufacturer if it fits the CG engine. Been on Whatsapp all night with different suppliers......

hertz9753 · 03-15-2017, 01:13 AM

The CSC uses a square bore engine and is counter balanced. It claims about 16 HP and the Hawk engine doesn't have that and is about 14 HP. Both are good engines but different.

pete · 03-15-2017, 03:29 AM

67x65= 229cc
70x65= 250cc
21cc or 11% more.
could be good for another 1.5/2hp

.

Ariel Red Hunter · 03-15-2017, 09:12 AM

Quote:

Originally Posted by mjstef

Working with a supplier for the oil coolers and may have found a big bore kit. No promises but MAYBE! What is the stock bore and stroke??

67mm bore by 65mm stroke. A 70mm bore on that same stroke is close to 250cc. A 10% improvement in displacement. Should give a 10% improvement in torque. And at least that much of an improvement in HP. The question is if the cases and the case bolt pattern will cover a 70mm bore....ARH

Dilioc95s · 04-04-2017, 06:35 AM

I am not quite sure about it. return man 3

Ariel Red Hunter · 04-04-2017, 05:15 PM

Quote:

Originally Posted by Dilioc95s

I am not quite sure about it.

What are you not quite sure about?...ARH

2LZ · 04-04-2017, 05:34 PM

I recall there being a 177FMM??? (77 being the bore). I'm not sure if it was water cooled or not.
W&G or culcune or some other CR old-timer will know better than I, if they chime in.

Weldangrind · 04-05-2017, 11:03 AM

I only ever saw large-bore engines like that on Taobao. It's tempting, but I'm not going to order one.

03-15-2017, 12:16 AM	#1
mjstef Join Date: May 2007 Location: Lac Du Flambeau, WI Posts: 804	Hawk CG engine bore and stroke???? Working with a supplier for the oil coolers and may have found a big bore kit. No promises but MAYBE! What is the stock bore and stroke??
	1

03-15-2017, 12:50 AM	#3
ughmas Join Date: Feb 2016 Location: NY Posts: 172	not sure if they are exactly the same or if it makes a difference but the TT250 service manual lists Bore x Stroke 66.5mm x 66.2mm __________________ 2005 CBR600RR 2016 CSC TT250 Coming Soon
	1

03-15-2017, 01:13 AM	#5
hertz9753 Join Date: May 2016 Location: Bismarck, ND Posts: 868	The CSC uses a square bore engine and is counter balanced. It claims about 16 HP and the Hawk engine doesn't have that and is about 14 HP. Both are good engines but different. __________________ 2015 and 3/4 RPS Hawk 250. Most people would call it a 2016 but the MCO didn't.
	3

03-15-2017, 03:29 AM	#6
pete Join Date: Jan 2012 Location: ChCh , NZ Posts: 2,261	67x65= 229cc 70x65= 250cc 21cc or 11% more. could be good for another 1.5/2hp . __________________ 09 XT660R ... 06 TTR250 ... 80 Montesa H6 125 Enduro... 77 Montesa Cota 348 MRR "Malcom Rathnell Replica"... Current resto projects.. 81 Honda CT110... 80 Kawasaki KL250A1... 11 Husaburg TE125 enduro... "sold" along with another 31... Lifan 125 Pitbike.. "stolen" ... KIWI BIKER FORUM...... http://www.kiwibiker.co.nz/forums/content.php All the best offroad rides in NZ... http://www.remotemoto.com/ E-mail... xtpete1@gmail.com
	1

04-04-2017, 06:35 AM	#8
Dilioc95s Join Date: Apr 2017 Posts: 1	I am not quite sure about it. return man 3 Last edited by Dilioc95s; 09-03-2017 at 09:22 PM.
	0

03-15-2017, 12:46 AM	#2
old kid Join Date: Feb 2017 Location: NY Posts: 170	this is all the info that is in the owners manual
	1

03-15-2017, 12:54 AM	#4
mjstef Join Date: May 2007 Location: Lac Du Flambeau, WI Posts: 804	I have found a cylinder with a 70mm bore. Still confirming with manufacturer if it fits the CG engine. Been on Whatsapp all night with different suppliers......
	3

04-04-2017, 05:34 PM	#10
2LZ Join Date: Mar 2010 Location: Volcano, Ca Posts: 7,081	I recall there being a 177FMM??? (77 being the bore). I'm not sure if it was water cooled or not. W&G or culcune or some other CR old-timer will know better than I, if they chime in. __________________ "Light a fire for a man, and you heat him for a day. Light a man on fire, and you heat him for the rest of his life." 2007 Suzuki DRZ400S (SM convert) 2009 Q Link XP 200 1967 BSA B25 250cc Starfire 2022 Royal Enfield Interceptor 650 2023 Royal Enfield Scram 411 1948 Royal Enfield Model G 350
	0

04-05-2017, 11:03 AM	#11
Weldangrind Join Date: Mar 2009 Location: Sardis, BC, Canada Posts: 25,977	I only ever saw large-bore engines like that on Taobao. It's tempting, but I'm not going to order one. __________________ 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