271cc CG?

OneLeggedRider · 10-11-2020, 11:48 AM

Has anyone tried it?

https://m.aliexpress.com/item/400087...0Q90.jpg_.webp

Emerikol · 10-11-2020, 12:43 PM

The cylinder in the picture is stamped as a 196CC. That's less than most of us have mounted now. Did I miss how to get to the 270CC mill? I wouldn't mind trying it if it was really a larger displacement.

2372ighost · 10-11-2020, 01:42 PM

I scrolled over the pics and found this 300 cylinder

XLsior · 10-11-2020, 07:26 PM

oversized pistons and larger diameter cylinder big bore kits are not uncommon but the issue is the wrist pin along with the jug being able to fit in the case.

the CG250 comes with a 67mm piston and 16mm pin as standard.

the CG200 has a 63.5mm piston and 15mm pin.

I am not familiar with the CG300 but looks to be a 69mm x 17mm

there will be a threshold where over sizing in non viable.

Emerikol · 10-11-2020, 07:41 PM

I'm not super crazy about the Hawk powerplant as it is, so rather than trying to polish that turd, I'm thinking about breaking out the cutting torch and welder and making something bigger, more reliable, and decidedly Japanese fit. That would solve a ton of the issues that these bikes have. Please don't misunderstand, though. I'm not unhappy with the bike at all, I just have no illusions about what it can and cannot do. Right now my Hawk is running great (or would be, if I would charge the battery and ride it once in a while), but if the need ever comes up, I think a total heart transplant would be the way to go.

alex_in_az · 10-11-2020, 09:05 PM

Quote:

Originally Posted by Emerikol

I'm not super crazy about the Hawk powerplant as it is, so rather than trying to polish that turd, I'm thinking about breaking out the cutting torch and welder and making something bigger, more reliable, and decidedly Japanese fit. That would solve a ton of the issues that these bikes have. Please don't misunderstand, though. I'm not unhappy with the bike at all, I just have no illusions about what it can and cannot do. Right now my Hawk is running great (or would be, if I would charge the battery and ride it once in a while), but if the need ever comes up, I think a total heart transplant would be the way to go.

there's a few things we can do to the bikes that improve power quite a bit, I'm not sure how much power they can put out but I have no problem getting mine to into the mid 70s for top speed

Wild Dog · 10-11-2020, 09:15 PM

Quote:

Originally Posted by XLsior

oversized pistons and larger diameter cylinder big bore kits are not uncommon but the issue is the wrist pin along with the jug being able to fit in the case.

When converting 230 to 299. The case is rebored, new connecting rod used new crankshaft.
Is not a drop in replacement.

Quote:

Originally Posted by Emerikol

I'm not super crazy about the Hawk powerplant as it is, so rather than trying to polish that turd, I'm thinking about breaking out the cutting torch and welder and making something bigger, more reliable, and decidedly Japanese fit.

Reliable? They are UBER reliable. I know cg engines with over 50.000 miles and they are still running strong.
The CG was designed to be reliable, no bells and whistles.

Quote:

Originally Posted by alex_in_az

there's a few things we can do to the bikes that improve power quite a bit, I'm not sure how much power they can put out but I have no problem getting mine to into the mid 70s for top speed

People need to understand the these motorcycle are not made to impress people and ride into the sunset with a gang of bikers. They were made to be a cheap mode of transport.

China Rider 27 · 10-11-2020, 09:45 PM

CG strong, Ride hard!

paulsstag · 10-12-2020, 11:11 AM

Quote:

Originally Posted by OneLeggedRider

Has anyone tried it?

https://m.aliexpress.com/item/400087...0Q90.jpg_.webp

I am busy collecting parts to upgrade my Brozz Recon. I have a cam and roller followers coming (early Nov). I will order the 4 degree flywheel key today. Full gasket set is already here just in case. I plan to deck the head 1 mm and port and polish.

The 300 kit is listed on the link one legged posted if you look. It says 70 mm and also 69 mm? either way it is bigger by 2 to 3mm.

This kit is $55 plus $44 shipping so $100 all in ? i am very tempted seeing as my bike is about to be worked on anyway.

Paul

Wild Dog · 10-12-2020, 02:33 PM

Quote:

Originally Posted by paulsstag

I am busy collecting parts to upgrade my Brozz Recon. I have a cam and roller followers coming (early Nov). I will order the 4 degree flywheel key today. Full gasket set is already here just in case. I plan to deck the head 1 mm and port and polish.

The 300 kit is listed on the link one legged posted if you look. It says 70 mm and also 69 mm? either way it is bigger by 2 to 3mm.

This kit is $55 plus $44 shipping so $100 all in ? i am very tempted seeing as my bike is about to be worked on anyway.

Paul

There are listing for 70mm and 69mm because is not the same if you want upgrade a cg200 or a cg250

It's in spanish, but there is no need to understand it, just take a look at the work done.
In the intro they said that they had to rebore the case by 2mm

10-11-2020, 11:48 AM	#1
OneLeggedRider Join Date: Nov 2018 Location: Stockport, Oh. Posts: 1,442	271cc CG? Has anyone tried it? https://m.aliexpress.com/item/400087...0Q90.jpg_.webp __________________ ~ Don't poke the bear ~ M.M.I. Dean's List graduate class of '95 and Specialty welder 2020 Ice Bear Terifecta 150cc Trike 2011 Honda Foreman 500ES 4x4 2001 Polaris Scrambler 400
	1

10-11-2020, 12:43 PM	#2
Emerikol Join Date: Oct 2016 Location: Carrollton, GA Posts: 1,467	The cylinder in the picture is stamped as a 196CC. That's less than most of us have mounted now. Did I miss how to get to the 270CC mill? I wouldn't mind trying it if it was really a larger displacement. __________________ First Rule of Aviation: -Never Pass Up The Opportunity to Pee I was struggling to get my wife's attention; I sat down on the couch and looked comfortable. That did the trick! My wife says I only have two faults. I don't listen and something else... If at first you don't succeed, try doing it the way I told you to... The Stable: 2005 Yamaha V-Star 650 - SOLD 2015 Suzuki DR 650 2015 RPS Hawk 250 - SOLD 2016 Ural Gear Up
	0

10-11-2020, 07:41 PM	#5
Emerikol Join Date: Oct 2016 Location: Carrollton, GA Posts: 1,467	I'm not super crazy about the Hawk powerplant as it is, so rather than trying to polish that turd, I'm thinking about breaking out the cutting torch and welder and making something bigger, more reliable, and decidedly Japanese fit. That would solve a ton of the issues that these bikes have. Please don't misunderstand, though. I'm not unhappy with the bike at all, I just have no illusions about what it can and cannot do. Right now my Hawk is running great (or would be, if I would charge the battery and ride it once in a while), but if the need ever comes up, I think a total heart transplant would be the way to go. __________________ First Rule of Aviation: -Never Pass Up The Opportunity to Pee I was struggling to get my wife's attention; I sat down on the couch and looked comfortable. That did the trick! My wife says I only have two faults. I don't listen and something else... If at first you don't succeed, try doing it the way I told you to... The Stable: 2005 Yamaha V-Star 650 - SOLD 2015 Suzuki DR 650 2015 RPS Hawk 250 - SOLD 2016 Ural Gear Up
	1

10-11-2020, 07:26 PM	#4
XLsior Join Date: Aug 2020 Location: Australia Posts: 1,448	oversized pistons and larger diameter cylinder big bore kits are not uncommon but the issue is the wrist pin along with the jug being able to fit in the case. the CG250 comes with a 67mm piston and 16mm pin as standard. the CG200 has a 63.5mm piston and 15mm pin. I am not familiar with the CG300 but looks to be a 69mm x 17mm there will be a threshold where over sizing in non viable.
	1

10-11-2020, 09:45 PM	#8
China Rider 27 Join Date: Dec 2018 Location: PNW Posts: 984	CG strong, Ride hard!
	0