300cc Kit - Page 20

2LZ · 08-17-2018, 12:36 PM

Love the 300 kit. As stated previously, made the bike much more friendly. Far less of a two stroke power band.
After I finish another car project I'm currently on, I'd be very interested in the front brake kit and water bottle.

pyoungbl · 08-19-2018, 10:19 AM

NZ, these changes started in Jan 2017. Is there any indication (by engine number?) that tells old from new? In my case I have a replacement engine so the date of bike manufacture does not help.

pyoungbl · 08-19-2018, 03:25 PM

OK, thanks for your help. My Chinese is a bit rusty.

Juanro · 08-19-2018, 08:58 PM

The counterbalance shaft part might be about this:
(Up, older version, down, newer)

pyoungbl · 08-20-2018, 10:15 AM

I can see that the internal ribbing changed, also a retainer on the counterbalance shaft bearing. I do not see a different number of bolts holding the cases together. Thus, I cannot see how one can determine which engine is the 'improved' one without tearing into the cases. Note that the two photos are taken from a slightly different angle, hiding one of the bolt holes in one of the photos. All this is moot until one needs a replacement internal part where there might be a different part number. As an aside, I think it's good that Zongshen makes small changes as needed to improve what appears to be a very well built engine.

2LZ · 08-20-2018, 11:28 AM

I just think it's neat that Zong is improving and updating. It proves that they're serious about this and not just pumping out a motor to flood the market, then walk away.

pyoungbl · 08-21-2018, 09:33 AM

NZ, your photos might show darn near anything but I can't tell because they are too small. My observations are based on the much better photo provided by Juarno, where the engine cases appear to have the same bolt pattern. If the outer cover is different that would indeed make it possible to spot the improved engine without splitting the cases.

NzBrakelathes · 08-21-2018, 12:22 PM

Sorry that my “free” information that was translated from the engine wholesaler here in China and not available in perfect English doesn’t meet for easy reading
Sorry I do not have the answers you want or that my work has no value to people etc
I’ll withdraw my post that shows and stated that this is all I know and nothing more.
Seems people want things on a platter and handed to them today! Not just here but other places too.
Sorry that I try n provided for my family and info for bike owners and try sell knowledge based components worldwide
How I rude of me

Huck369 · 08-23-2018, 10:26 AM

Finally got around to getting my kit installed, what is the actual CC's with the kit added, I recall seeing it somewhere, but can't find it now....
I know it's not 300cc's, but can't remember what it actually was....

ChondaChondaChonda · 08-23-2018, 11:26 AM

Quote:

Originally Posted by Huck369

Finally got around to getting my kit installed, what is the actual CC's with the kit added, I recall seeing it somewhere, but can't find it now....
I know it's not 300cc's, but can't remember what it actually was....

283cc

Juanro · 08-23-2018, 11:27 AM

This is original NC250
Bore x Stroke : 77×53.6mm
With the "300" kit, we're getting bore = 82mm, and stroke is the same.
So if my math is right, this is 283cc, a 13.2% increase

Juanro · 08-23-2018, 11:31 AM

My own kit is about to come the 1000km mark since installed
Love, really love the added torque, seems much more than 13% increase.
Every road I know, I can ride now a gear higher (and thus about 1K / 1,5K rpm lower)
Cruise speed is about the same, but no need to downshift overpassing slow trucks. Recovery in 6th from 5K to 7K rpm is really fast and smooth
Also engine sounds much fuller and bigger.

Weldangrind · 08-23-2018, 12:02 PM

Quote:

Originally Posted by Juanro

This is original NC250
Bore x Stroke : 77×53.6mm
With the "300" kit, we're getting bore = 82mm, and stroke is the same.
So if my math is right, this is 283cc, a 13.2% increase

I came up with the same number. What I find interesting is that the original displacement is 249.6cc; it's an actual 250cc. So often, motorcycle manufacturers will round up the displacement, like Yamaha did with the second generation SR250 (which was only 239cc).

Huck369 · 08-23-2018, 12:20 PM

Quote:

Originally Posted by ChondaChondaChonda

283cc

Thanks!!

NzBrakelathes · 08-23-2018, 04:15 PM

Quote:

Originally Posted by Juanro

My own kit is about to come the 1000km mark since installed
Love, really love the added torque, seems much more than 13% increase.
Every road I know, I can ride now a gear higher (and thus about 1K / 1,5K rpm lower)
Cruise speed is about the same, but no need to downshift overpassing slow trucks. Recovery in 6th from 5K to 7K rpm is really fast and smooth
Also engine sounds much fuller and bigger.

For all it’s worth I may have found a used EFI kit from the Kayo K6
If you still feel the need etc do send a PM and I can look closer at things for you

08-17-2018, 12:36 PM	#286
2LZ Join Date: Mar 2010 Location: Volcano, Ca Posts: 7,081	Love the 300 kit. As stated previously, made the bike much more friendly. Far less of a two stroke power band. After I finish another car project I'm currently on, I'd be very interested in the front brake kit and water bottle. __________________ "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
	2

08-20-2018, 11:28 AM	#291
2LZ Join Date: Mar 2010 Location: Volcano, Ca Posts: 7,081	I just think it's neat that Zong is improving and updating. It proves that they're serious about this and not just pumping out a motor to flood the market, then walk away. __________________ "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
	2

08-23-2018, 10:26 AM	#294
Huck369 Join Date: Apr 2008 Location: Somerset, KY Posts: 685	Finally got around to getting my kit installed, what is the actual CC's with the kit added, I recall seeing it somewhere, but can't find it now.... I know it's not 300cc's, but can't remember what it actually was.... __________________ Huck 2013 Honda NC700X 2013 Moto Guzzi V7 Stone 2016 AJP PR4 2022 Templar X 250 2021 Sondors Metacycle AMA Life Member
	0

08-19-2018, 10:19 AM	#287
pyoungbl Join Date: Feb 2016 Location: Portsmouth, Virginia, USA Posts: 632	NZ, these changes started in Jan 2017. Is there any indication (by engine number?) that tells old from new? In my case I have a replacement engine so the date of bike manufacture does not help.
	0

08-19-2018, 03:25 PM	#288
pyoungbl Join Date: Feb 2016 Location: Portsmouth, Virginia, USA Posts: 632	OK, thanks for your help. My Chinese is a bit rusty.
	0

08-20-2018, 10:15 AM	#290
pyoungbl Join Date: Feb 2016 Location: Portsmouth, Virginia, USA Posts: 632	I can see that the internal ribbing changed, also a retainer on the counterbalance shaft bearing. I do not see a different number of bolts holding the cases together. Thus, I cannot see how one can determine which engine is the 'improved' one without tearing into the cases. Note that the two photos are taken from a slightly different angle, hiding one of the bolt holes in one of the photos. All this is moot until one needs a replacement internal part where there might be a different part number. As an aside, I think it's good that Zongshen makes small changes as needed to improve what appears to be a very well built engine.
	0

08-21-2018, 09:33 AM	#292
pyoungbl Join Date: Feb 2016 Location: Portsmouth, Virginia, USA Posts: 632	NZ, your photos might show darn near anything but I can't tell because they are too small. My observations are based on the much better photo provided by Juarno, where the engine cases appear to have the same bolt pattern. If the outer cover is different that would indeed make it possible to spot the improved engine without splitting the cases.
	0

08-21-2018, 12:22 PM	#293
NzBrakelathes Join Date: Jun 2016 Location: Hell Posts: 2,408	Sorry that my “free” information that was translated from the engine wholesaler here in China and not available in perfect English doesn’t meet for easy reading Sorry I do not have the answers you want or that my work has no value to people etc I’ll withdraw my post that shows and stated that this is all I know and nothing more. Seems people want things on a platter and handed to them today! Not just here but other places too. Sorry that I try n provided for my family and info for bike owners and try sell knowledge based components worldwide How I rude of me
	0

08-23-2018, 11:27 AM	#296
Juanro Join Date: Oct 2015 Posts: 321	This is original NC250 Bore x Stroke : 77×53.6mm With the "300" kit, we're getting bore = 82mm, and stroke is the same. So if my math is right, this is 283cc, a 13.2% increase
	2

08-23-2018, 11:31 AM	#297
Juanro Join Date: Oct 2015 Posts: 321	My own kit is about to come the 1000km mark since installed Love, really love the added torque, seems much more than 13% increase. Every road I know, I can ride now a gear higher (and thus about 1K / 1,5K rpm lower) Cruise speed is about the same, but no need to downshift overpassing slow trucks. Recovery in 6th from 5K to 7K rpm is really fast and smooth Also engine sounds much fuller and bigger.
	2