hawk 250 big bore kit?

zanoknight · 08-14-2018, 06:01 PM

I know it sounds silly but does anyone know if theres a big bore kit for a hawk 250?

Azhule · 08-14-2018, 06:44 PM

Aren't these engines already a "big bore kit" slapped on a small 125cc engine to bring it up that 229 range?

Might be time to find that "replacement for displacement" (higher compression, port/polished head, smog pump boosted, 4 valve 223cc OHC engine swap, etc.)

2LZ · 08-15-2018, 11:12 AM

I've not heard of one and as Azhule points out, these started as a 125. That said, they did take the small block Chevy all the way to a 400!

I figure one of our resident parts guys (mjstef or NZ) may delve into this someday. They'd probably sell one to every CG rider here.

Weldangrind · 08-15-2018, 12:35 PM

There are larger CG motors (in the 270 range, rounded up to 300), but that's liquid cooled territory. I haven't seen one that size that is air cooled.
Search Taobao for CG270, CG300, etc. Get creative with the numbers you search for and you'll find some cool stuff.

Gh426 · 08-15-2018, 10:08 PM

folks are overbore / stroking horror freight $99. pull start 212cc's surely the hawk 230 is due for a "kit"...

slowroller · 08-15-2018, 10:17 PM

Not worth it for the price. Need a custom piston kit 300 custom head gasket 45 bore hone deck cylinder 100 balance crank if need mallory could be as much as 200 how much would you like to spend for 10% power gain?

Gh426 · 08-15-2018, 10:18 PM

$35 sounds good!

slowroller · 08-15-2018, 10:19 PM

Cylinder only so thick resleeve cylinder probaly 200 more.

slowroller · 08-15-2018, 10:22 PM

Wiseco minimum order 4 pistons 900+ dollars cant remember exactly.

slowroller · 08-15-2018, 10:58 PM

As far as harbor freight or box stock project lifan motors around 16 hp the cylinders separerate from the block which is one piece. Honda blocks are stronger a little we run them in go cart racing a couple years ago. Was suppose to be cheap they changed rules every week. Till the cost was the same as a briggs animal motor.

Gh426 · 08-16-2018, 01:06 AM

https://www.nrracing.com/category-s/2030.htm

this is crazy making.

NzBrakelathes · 08-16-2018, 01:50 AM

Quote:

Originally Posted by zanoknight

I know it sounds silly but does anyone know if theres a big bore kit for a hawk 250?

You would be better changing the whole engine to the OHC CB250-F engine with 2549cc (Can't recall bore and stroke just now)

The Hawk or CSC TT 250 only run the base model push rod engines etc.

There is a 300cc push rod motor that's water cooled and suitable for the 3 wheel trikes but that would work out rather complex

slowroller · 08-16-2018, 07:58 AM

Hawk 167fmm motor not a bad platform for tinkering. I got a aftermarket head for mine night and day difference in ports id say 1 hp no porting i can stick my whole finger in ex port where a stock hawk only 3/4 inch in ex port. I would like same motor just do some good old boy tricks most dont have a clue about you be supprised. Id also like to get mine on ethonal for cooling purposes since we got a big gas tank i think i could still have a 180 mile distance all id ride in a day.

**JerryHawk250** · 08-16-2018, 08:59 AM

Porting and decking the head will get you some extra ponies along with free flowing exhaust and better freer flowing carb.

jimwildman · 08-16-2018, 04:02 PM

Quote:

Originally Posted by Azhule

Aren't these engines already a "big bore kit" slapped on a small 125cc engine to bring it up that 229 range?

Might be time to find that "replacement for displacement" (higher compression, port/polished head, smog pump boosted, 4 valve 223cc OHC engine swap, etc.)

I think the replacement is displacement.. for me it comes in the form of an xl500s engine.

08-14-2018, 06:01 PM	#1
zanoknight Join Date: Mar 2016 Location: Chicago, IL Posts: 46	hawk 250 big bore kit? I know it sounds silly but does anyone know if theres a big bore kit for a hawk 250?
	0

08-14-2018, 06:44 PM	#2
Azhule Join Date: Dec 2015 Location: CO Posts: 1,525	Aren't these engines already a "big bore kit" slapped on a small 125cc engine to bring it up that 229 range? Might be time to find that "replacement for displacement" (higher compression, port/polished head, smog pump boosted, 4 valve 223cc OHC engine swap, etc.) __________________ "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.
	3

08-15-2018, 11:12 AM	#3
2LZ Join Date: Mar 2010 Location: Volcano, Ca Posts: 7,112	I've not heard of one and as Azhule points out, these started as a 125. That said, they did take the small block Chevy all the way to a 400! I figure one of our resident parts guys (mjstef or NZ) may delve into this someday. They'd probably sell one to every CG rider here. __________________ "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

08-15-2018, 12:35 PM	#4
Weldangrind Join Date: Mar 2009 Location: Sardis, BC, Canada Posts: 25,977	There are larger CG motors (in the 270 range, rounded up to 300), but that's liquid cooled territory. I haven't seen one that size that is air cooled. Search Taobao for CG270, CG300, etc. Get creative with the numbers you search for and you'll find some cool stuff. __________________ 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
	2

08-16-2018, 01:06 AM	#11
Gh426 Join Date: Feb 2018 Location: LA Posts: 74	Wow https://www.nrracing.com/category-s/2030.htm this is crazy making.
	0

08-15-2018, 10:08 PM	#5
Gh426 Join Date: Feb 2018 Location: LA Posts: 74	folks are overbore / stroking horror freight $99. pull start 212cc's surely the hawk 230 is due for a "kit"...
	0

08-15-2018, 10:17 PM	#6
slowroller Join Date: May 2018 Posts: 77	Not worth it for the price. Need a custom piston kit 300 custom head gasket 45 bore hone deck cylinder 100 balance crank if need mallory could be as much as 200 how much would you like to spend for 10% power gain?
	0

08-15-2018, 10:18 PM	#7
Gh426 Join Date: Feb 2018 Location: LA Posts: 74	$35 sounds good!
	2

08-15-2018, 10:19 PM	#8
slowroller Join Date: May 2018 Posts: 77	Cylinder only so thick resleeve cylinder probaly 200 more.
	0

08-15-2018, 10:22 PM	#9
slowroller Join Date: May 2018 Posts: 77	Wiseco minimum order 4 pistons 900+ dollars cant remember exactly.
	0

08-15-2018, 10:58 PM	#10
slowroller Join Date: May 2018 Posts: 77	As far as harbor freight or box stock project lifan motors around 16 hp the cylinders separerate from the block which is one piece. Honda blocks are stronger a little we run them in go cart racing a couple years ago. Was suppose to be cheap they changed rules every week. Till the cost was the same as a briggs animal motor.
	0

08-16-2018, 07:58 AM	#13
slowroller Join Date: May 2018 Posts: 77	Hawk 167fmm motor not a bad platform for tinkering. I got a aftermarket head for mine night and day difference in ports id say 1 hp no porting i can stick my whole finger in ex port where a stock hawk only 3/4 inch in ex port. I would like same motor just do some good old boy tricks most dont have a clue about you be supprised. Id also like to get mine on ethonal for cooling purposes since we got a big gas tank i think i could still have a 180 mile distance all id ride in a day.
	2

08-16-2018, 08:59 AM	#14
JerryHawk250 Moderator Join Date: Oct 2016 Location: Houma, La. Posts: 11,724	Porting and decking the head will get you some extra ponies along with free flowing exhaust and better freer flowing carb. __________________ 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
	2