Hi there! Converting CG125 to 250

Gooseberry · 08-04-2020, 07:52 PM

Hi there guys, been a lurker for quite some time but decided to make an account and get stuck in. I've got a 1996 CG125T that I've used as a runner for the as couple of years but as I've been moving onto different bikes I thought I might as well have a bit of fun and see if I can get a bigger engine in it and maybe something more.

I've seen Zongshen and a couple of other brands and a big bore kit for 250cc but trying to figure out what won't blow up 10 miles into a trip.

I've got a 1995 nighthawk that runs well but I don't really use but I doubt the engine would fit in there.

Where can I find this Hawk 250 engine everyone talks about and is it as simple as a bolt on?

Either way great to finally say hello!

NzBrakelathes · 08-04-2020, 08:43 PM

125 to 150 is a big bore.
125 to 200 is crank and big bore
no 250 option as studs are in different location max 200

franque · 08-05-2020, 06:14 AM

Hello, best of luck with that! If you decide to go the 200 route, you'll also need longer pushrods and studs.

**JerryHawk250** · 08-05-2020, 08:31 AM

A complete engine swap would be less painful. A few options. https://shop.brozz250.com/eshopprod_...e_Assembly.htm
https://partskit.com/product/engine?m=117935
https://www.ebay.com/itm/250cc-engin...t/254159558977

08-04-2020, 07:52 PM	#1
Gooseberry Join Date: Aug 2020 Posts: 8	Hi there! Converting CG125 to 250 Hi there guys, been a lurker for quite some time but decided to make an account and get stuck in. I've got a 1996 CG125T that I've used as a runner for the as couple of years but as I've been moving onto different bikes I thought I might as well have a bit of fun and see if I can get a bigger engine in it and maybe something more. I've seen Zongshen and a couple of other brands and a big bore kit for 250cc but trying to figure out what won't blow up 10 miles into a trip. I've got a 1995 nighthawk that runs well but I don't really use but I doubt the engine would fit in there. Where can I find this Hawk 250 engine everyone talks about and is it as simple as a bolt on? Either way great to finally say hello!
	0

08-05-2020, 08:31 AM	#4
JerryHawk250 Moderator Join Date: Oct 2016 Location: Houma, La. Posts: 11,723	A complete engine swap would be less painful. A few options. https://shop.brozz250.com/eshopprod_...e_Assembly.htm https://partskit.com/product/engine?m=117935 https://www.ebay.com/itm/250cc-engin...t/254159558977 __________________ 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 Last edited by JerryHawk250; 08-05-2020 at 09:20 AM.
	1

08-04-2020, 08:43 PM	#2
NzBrakelathes Join Date: Jun 2016 Location: Hell Posts: 2,408	125 to 150 is a big bore. 125 to 200 is crank and big bore no 250 option as studs are in different location max 200
	2

08-05-2020, 06:14 AM	#3
franque Join Date: Nov 2017 Location: Marseille, France -> Conakry, Guinea Posts: 1,481	Hello, best of luck with that! If you decide to go the 200 route, you'll also need longer pushrods and studs.
	0