NC250 Big Bore Kit - Page 3

ChopperCharles · 03-16-2021, 10:42 AM

One thing not mentioned by the OP... how do you set the valve timing once you've had the cam out and the head off?

Charles.

franque · 03-16-2021, 02:49 PM

Usually there are marks that align on the head and cam sprockets. If not, use two dots of nail polish (or a paint marker) on the sprockets and head to mark where they were aligned, and then two different marks on the sprockets and timing chain to make sure the chain stays aligned.

Then, usually you get like a coat hanger or something to hold the chain in place, and then you fish the cylinder through that while maintaining tension on the chain.

Another way you could do that is remove the flywheel cover and mark a third spot on the crank sprocket and chain.

An additional way would be to forget about the chain placement, get a degree wheel, find actual TDC with a piston stop upon reinstalling the cylinder and head, and then using the marks for the cams, throw the chain on.

Make sure the tensioners and guides are properly lined up, and that you mark for tensioner uninstalled if marking the chain, someone installed the bbk without getting the chain guides lined up, and they had issues getting it together.

Plump Kibbles · 06-20-2021, 06:31 PM

Any idea if this is able to fit the X-Pro Zongshen 250cc?? I'm very quickly running out of speed.. and torque.. for how I ride that is.

I've been looking at some of the 300 kits, but very, very unsure if this or the others would even fit.. MAN would this thing really open up with a big bore kit...

Sounds good!

franque · 06-20-2021, 06:45 PM

Yours is air cooled, right? If so, no, it won't work

Plump Kibbles · 06-20-2021, 06:49 PM

Quote:

Originally Posted by franque

Yours is air cooled, right? If so, no, it won't work

Well.. crap. Was hoping that wasn't going to be the caveat - but yes, it's air cooled

Been thinking about getting a Honda 250cc with 6 gears but still no idea if that would work either lol

Have you had it together enough for a ride?? Very curious about the power / torque increase and top speed!

franque · 06-21-2021, 12:41 AM

I don't have one. Depending on what model your motor is, Joe Henner (search Facebook for Zongshen Performance parts) is working on a bbk for the motors that are really 250cc... Perhaps that is an option for you? What is the actual motor code?

Plump Kibbles · 06-21-2021, 11:03 PM

Quote:

Originally Posted by franque

What is the actual motor code?

Eh, would this be on the engine anywhere? I did notice that I don't have an oil view window

franque · 06-22-2021, 12:26 AM

Below and in front of the shifter, same place for any of the air cooled motors. It should be something like "1XXFMM". The XXs would be replaced with two digits, and it might have a dash and then a number.

Plump Kibbles · 06-22-2021, 12:45 AM

Quote:

Originally Posted by franque

Below and in front of the shifter, same place for any of the air cooled motors. It should be something like "1XXFMM". The XXs would be replaced with two digits, and it might have a dash and then a number.

Gotcha - ZS165FML

2LZ · 06-22-2021, 12:58 AM

This work???

https://www.ebay.com/itm/69mm-Big-Bo...3098796?_ul=CN

Plump Kibbles · 06-22-2021, 01:04 AM

Quote:

Originally Posted by franque

I don't have one. Depending on what model your motor is, Joe Henner (search Facebook for Zongshen Performance parts) is working on a bbk for the motors that are really 250cc... Perhaps that is an option for you? What is the actual motor code?

Forgot to mention - I'm not on FaceSpace anymore. Got off years ago, been great ever since lol

Plump Kibbles · 06-22-2021, 07:20 PM

Quote:

Originally Posted by jeffrey

His bike has a CG 229 push rod OHV engine.

Whose? I've got a SOHC setup..

I'm just waiting for someone that knows my engine; apparently different than the Hawks and such.. go me!

I'm not exactly sure if the Orion has the same engine as mine either - though it's a cheaper version of the RXB 250's..

franque · 06-23-2021, 03:58 PM

Give Joe Henner a call, I'll pm you his number. The Chinese don't use codes to distinguish between OHC/pushrod, so that person you quoted probably jumped the gun. Henner ports heads and has other mods available that might interest you.

Plump Kibbles · 06-23-2021, 05:15 PM

Quote:

Originally Posted by franque

Give Joe Henner a call, I'll pm you his number. The Chinese don't use codes to distinguish between OHC/pushrod, so that person you quoted probably jumped the gun. Henner ports heads and has other mods available that might interest you.

Definitely appreciate it, man!

I just found a Lifan dealer over in Charleston WV, few hours from me. I'd like to go check it out just to see what they've got! I'm in the market for a street bike now just for fun. Not sure if they would have anything for me engine - but maybe could do some service! Also got a SS exhaust kit but doesn't exactly fit - need a bend..

I'll be giving Joe a call for sure though!

06-20-2021, 06:31 PM	#33
Plump Kibbles Join Date: Sep 2020 Location: Virginia Posts: 233	Any idea if this is able to fit the X-Pro Zongshen 250cc?? I'm very quickly running out of speed.. and torque.. for how I ride that is. I've been looking at some of the 300 kits, but very, very unsure if this or the others would even fit.. MAN would this thing really open up with a big bore kit... Sounds good! __________________ \|2020 X-Pro Titan DLX\| <-- FOR SALE!!
	0

06-22-2021, 12:58 AM	#40
2LZ Join Date: Mar 2010 Location: Volcano, Ca Posts: 7,078	This work??? https://www.ebay.com/itm/69mm-Big-Bo...3098796?_ul=CN __________________ "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
	1

03-16-2021, 10:42 AM	#31
ChopperCharles Join Date: Feb 2018 Location: RDU, NC Posts: 677	One thing not mentioned by the OP... how do you set the valve timing once you've had the cam out and the head off? Charles.
	0

03-16-2021, 02:49 PM	#32
franque Join Date: Nov 2017 Location: Marseille, France -> Conakry, Guinea Posts: 1,481	Usually there are marks that align on the head and cam sprockets. If not, use two dots of nail polish (or a paint marker) on the sprockets and head to mark where they were aligned, and then two different marks on the sprockets and timing chain to make sure the chain stays aligned. Then, usually you get like a coat hanger or something to hold the chain in place, and then you fish the cylinder through that while maintaining tension on the chain. Another way you could do that is remove the flywheel cover and mark a third spot on the crank sprocket and chain. An additional way would be to forget about the chain placement, get a degree wheel, find actual TDC with a piston stop upon reinstalling the cylinder and head, and then using the marks for the cams, throw the chain on. Make sure the tensioners and guides are properly lined up, and that you mark for tensioner uninstalled if marking the chain, someone installed the bbk without getting the chain guides lined up, and they had issues getting it together.
	0

06-20-2021, 06:45 PM	#34
franque Join Date: Nov 2017 Location: Marseille, France -> Conakry, Guinea Posts: 1,481	Yours is air cooled, right? If so, no, it won't work
	0

06-21-2021, 12:41 AM	#36
franque Join Date: Nov 2017 Location: Marseille, France -> Conakry, Guinea Posts: 1,481	I don't have one. Depending on what model your motor is, Joe Henner (search Facebook for Zongshen Performance parts) is working on a bbk for the motors that are really 250cc... Perhaps that is an option for you? What is the actual motor code?
	1

06-22-2021, 12:26 AM	#38
franque Join Date: Nov 2017 Location: Marseille, France -> Conakry, Guinea Posts: 1,481	Below and in front of the shifter, same place for any of the air cooled motors. It should be something like "1XXFMM". The XXs would be replaced with two digits, and it might have a dash and then a number.
	0

06-23-2021, 03:58 PM	#43
franque Join Date: Nov 2017 Location: Marseille, France -> Conakry, Guinea Posts: 1,481	Give Joe Henner a call, I'll pm you his number. The Chinese don't use codes to distinguish between OHC/pushrod, so that person you quoted probably jumped the gun. Henner ports heads and has other mods available that might interest you.
	2