big bore kit

markwr35 · 11-20-2008, 03:03 PM

Hi does anyone know where in the uk i can get a big bore kit for 125 gy
any links would be nice

thanks
mark

katoranger · 11-20-2008, 03:06 PM

I think that the 200cc parts will bolt on to your bottom end.

Try the scrapyards for a 200cc china bike and grab the top end.

Allen

markwr35 · 11-20-2008, 03:09 PM

do they all bolt together the same then

katoranger · 11-20-2008, 03:38 PM

I believe so. You will need to verify if you have a pushrod or OHC engine.

Allen

markwr35 · 11-20-2008, 03:40 PM

its a push rod one

katoranger · 11-20-2008, 03:51 PM

My lifan GY2 is a pushrod engine. You could look for one of those or parts for one of those.

Allen

czowner · 11-21-2008, 04:30 AM

I very much doubt that you'll find many 200cc parts in the breakers here in the UK. There are 2 variations of the 200cc OHV motor, both have a longer stroke as well. Bolting on a 200 top end (assuming it fits) will only give you 155cc or 173cc bepending on the bore of the 200 top end. You may be able to put the 200 crank into your 125 casings but it's by no means straight forward. Although these Chinese motors all look the same there are some big internal differences. If you have your heart set on a bigger motor there plenty of people in the UK who will sell you a complete motor but it ain't cheap at about Â£300+ shipping.

Jonathan.

red2003 · 11-21-2008, 09:42 AM

The 125 to 200 will not just bolt up. The 150's and 200's might as they have the same stroke, but the 125 is shorter.

markwr35 · 11-21-2008, 12:00 PM

IF I CHANGED THE ENGINE TO A 200/250 WOULD ALL THE OTHER PARTS FIT STILL (CARB,WIRING,CDI,EXHAUST,)FROM A 125 MODEL

THANKS

MARK

czowner · 11-23-2008, 06:22 AM

Quote:

Originally Posted by markwr35

IF I CHANGED THE ENGINE TO A 200/250 WOULD ALL THE OTHER PARTS FIT STILL (CARB,WIRING,CDI,EXHAUST,)FROM A 125 MODEL

THANKS

MARK

The mechanical parts should swap OK, there are variations in the wiring, most have 2.8mm mini blades on the CDI and regulator. My Hongdou has 6.3mm blades.

Jonathan.

katoranger · 11-24-2008, 09:16 AM

Thanks Red for clearing that up.

I realize that you probably are looking for more power while on a restricted license yet. I really think the easiest solution would be for you to put in a larger engine.

You will probably need a larger carb also.

Allen

11-20-2008, 03:03 PM	#1
markwr35 Join Date: Sep 2008 Location: leeds uk Posts: 39	big bore kit Hi does anyone know where in the uk i can get a big bore kit for 125 gy any links would be nice thanks mark __________________ gy 125 gas gas 250 aprillia rs125 (my baby) Now sold to buy my sons xr 125 If it works leave it or better weld it
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11-20-2008, 03:06 PM	#2
katoranger Join Date: May 2007 Location: Altamont, Kansas Posts: 15,103	I think that the 200cc parts will bolt on to your bottom end. Try the scrapyards for a 200cc china bike and grab the top end. Allen __________________ You meet the nicest people on a Honda Clone.
	0

11-20-2008, 03:09 PM	#3
markwr35 Join Date: Sep 2008 Location: leeds uk Posts: 39	do they all bolt together the same then __________________ gy 125 gas gas 250 aprillia rs125 (my baby) Now sold to buy my sons xr 125 If it works leave it or better weld it
	0

11-20-2008, 03:38 PM	#4
katoranger Join Date: May 2007 Location: Altamont, Kansas Posts: 15,103	I believe so. You will need to verify if you have a pushrod or OHC engine. Allen __________________ You meet the nicest people on a Honda Clone.
	0

11-20-2008, 03:40 PM	#5
markwr35 Join Date: Sep 2008 Location: leeds uk Posts: 39	its a push rod one __________________ gy 125 gas gas 250 aprillia rs125 (my baby) Now sold to buy my sons xr 125 If it works leave it or better weld it
	0

11-20-2008, 03:51 PM	#6
katoranger Join Date: May 2007 Location: Altamont, Kansas Posts: 15,103	My lifan GY2 is a pushrod engine. You could look for one of those or parts for one of those. Allen __________________ You meet the nicest people on a Honda Clone.
	0

11-21-2008, 04:30 AM	#7
czowner Join Date: Sep 2006 Location: North East England Posts: 313	I very much doubt that you'll find many 200cc parts in the breakers here in the UK. There are 2 variations of the 200cc OHV motor, both have a longer stroke as well. Bolting on a 200 top end (assuming it fits) will only give you 155cc or 173cc bepending on the bore of the 200 top end. You may be able to put the 200 crank into your 125 casings but it's by no means straight forward. Although these Chinese motors all look the same there are some big internal differences. If you have your heart set on a bigger motor there plenty of people in the UK who will sell you a complete motor but it ain't cheap at about Â£300+ shipping. Jonathan.
	0

11-21-2008, 09:42 AM	#8
red2003 Join Date: Jan 2007 Location: Northern Vermont, USA Posts: 1,240	The 125 to 200 will not just bolt up. The 150's and 200's might as they have the same stroke, but the 125 is shorter. __________________ First Chinabike: 2006 Roketa RSX200E Current Chinabikes: 2023 Titan DLX & 2022 Lifan KP Mini w/ 210cc BRT kit, 22 RWHP!
	0

11-21-2008, 12:00 PM	#9
markwr35 Join Date: Sep 2008 Location: leeds uk Posts: 39	IF I CHANGED THE ENGINE TO A 200/250 WOULD ALL THE OTHER PARTS FIT STILL (CARB,WIRING,CDI,EXHAUST,)FROM A 125 MODEL THANKS MARK __________________ gy 125 gas gas 250 aprillia rs125 (my baby) Now sold to buy my sons xr 125 If it works leave it or better weld it
	0

11-24-2008, 09:16 AM	#11
katoranger Join Date: May 2007 Location: Altamont, Kansas Posts: 15,103	Thanks Red for clearing that up. I realize that you probably are looking for more power while on a restricted license yet. I really think the easiest solution would be for you to put in a larger engine. You will probably need a larger carb also. Allen __________________ You meet the nicest people on a Honda Clone.
	0