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.)

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.

Gh426 · 08-17-2018, 03:13 AM

"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."

oK SO you went all e85 on me... yes I am down, You gonna run a small tank to "pickle" the carb back to reg gas just before shutting her down?

You got a cam in mind? how much was this 2nd head? got a link?

I am wating on these extra tricks.. C'mon you gonna spill da beans??

gh

slowroller · 08-17-2018, 08:32 AM

The csc tt250 head is better out box than hawk head but is a emissions head so you have to block off emissions port. Mine is a non emission head i found searching. The only thing to look for is bolt holes and bore size bore is 67mm if your not sure. They range in price from 50 to 150 dollars.

slowroller · 08-17-2018, 08:36 AM

Also get a thin shim head gasket if you can the one i got is around .016 thick. Stock is .041 thick and my piston is in hole .030. Make sure to use copperkote or hylamar sealer.

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, 10:19 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, 10:17 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, 10:58 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.

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

08-17-2018, 03:13 AM	#4
Gh426 Join Date: Feb 2018 Location: LA Posts: 74	Ok slowroller Good ole boy TRICKS "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." oK SO you went all e85 on me... yes I am down, You gonna run a small tank to "pickle" the carb back to reg gas just before shutting her down? You got a cam in mind? how much was this 2nd head? got a link? I am wating on these extra tricks.. C'mon you gonna spill da beans?? gh
	0

08-15-2018, 11:12 AM	#7
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	#8
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

08-17-2018, 08:32 AM	#5
slowroller Join Date: May 2018 Posts: 77	The csc tt250 head is better out box than hawk head but is a emissions head so you have to block off emissions port. Mine is a non emission head i found searching. The only thing to look for is bolt holes and bore size bore is 67mm if your not sure. They range in price from 50 to 150 dollars.
	1

08-17-2018, 08:36 AM	#6
slowroller Join Date: May 2018 Posts: 77	Also get a thin shim head gasket if you can the one i got is around .016 thick. Stock is .041 thick and my piston is in hole .030. Make sure to use copperkote or hylamar sealer.
	1

08-15-2018, 10:08 PM	#9
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, 10:19 PM	#10
slowroller Join Date: May 2018 Posts: 77	Cylinder only so thick resleeve cylinder probaly 200 more.
	0

08-15-2018, 10:22 PM	#11
slowroller Join Date: May 2018 Posts: 77	Wiseco minimum order 4 pistons 900+ dollars cant remember exactly.
	0

08-15-2018, 10:17 PM	#12
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	#13
Gh426 Join Date: Feb 2018 Location: LA Posts: 74	$35 sounds good!
	2

08-15-2018, 10:58 PM	#14
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, 01:06 AM	#15
Gh426 Join Date: Feb 2018 Location: LA Posts: 74	Wow https://www.nrracing.com/category-s/2030.htm this is crazy making.
	0