Jianshe Cross sport tunning

**beniamin82** · 12-21-2015, 08:57 AM

Hi,

I friend asked me if i could search for a tunnig kit for the head of his Jianshe 125 Cross.

vin LAPYCJLB74A0XXXXX

engine (OHC) JS156FMI 4J85092

He search for the plastic ellements too.

**Zorge** · 12-21-2015, 12:32 PM

"Tuning kit for the head"?

**humanbeing** · 12-21-2015, 12:58 PM

61mm kit is readily available.
http://item.taobao.com/item.htm?id=40431112947 Barrel (斯贝) http://www.china-spey.com | Riken (理研 http://www.riken.com.cn/en/home.asp) rings option costs more $ than stock ### kick (脚) ONLY model is different from electric (电) model ###

**beniamin82** · 12-21-2015, 01:01 PM

Originally Posted by Zorge

"Tuning kit for the head"?

He search for a Sport camshaft or 4valves head.

**MJH** · 12-21-2015, 01:46 PM

Here are some ideas, the big bore is a good option.
http://www.swapandchop.com/tag/cb125-performance-mods/

There are cams for the CB125, but that would be a shot in the dark.
http://www.webcamshafts.com/mobile/m...)_sohc_2v.html

You would think that the body parts would be easy to find given the ridiculous number of them that were manufactured.

**humanbeing** · 12-21-2015, 02:22 PM

Taiwanese is the guru for these mod (they had strict law can't swap engine...)
Find out what http://forum.jorsindo.com/thread-2315282-1-1.html 51#| 63# | 65# said ...
There's also some CRAZY 4v mod in that forum...

**NZBrakelathes** · 03-22-2016, 03:50 AM

Originally Posted by humanbeing

Taiwanese is the guru for these mod (they had strict law can't swap engine...)
Find out what http://forum.jorsindo.com/thread-2315282-1-1.html 51#| 63# | 65# said ...
There's also some CRAZY 4v mod in that forum...

Hi mate

CG150 ZS162FMJ to 200cc big bore kit, seems if you for a standard barrel and piston from the 200cc you loose compression due to lack of stroke?
Is there a kit or piston that compensates for this? Does 125cc head Have enough combustion chamber surface area?
What's the best way to really get more cc and power?
Chinese mechanics told me little to no gain due to lower compression as the stroke is also a little shorter

**humanbeing** · 03-22-2016, 08:41 AM

Originally Posted by NZBrakelathes

Chinese mechanics told me little to no gain due to lower compression as the stroke is also a little shorter

That mechanic tells the truth... Most CG200 is 63.5...
Another bigger or "CB" (rev more freely) engine is less hassle
If still wants the modding, try 1 of these
125 head jammed to 150 c/r ~10.?:1 | 65.5 kit | 200 barrel & crank

**NZBrakelathes** · 03-22-2016, 03:14 PM

125 head need mod? For combustion chamber?
Seems to get it right you need a crank too huh
175cc same issue?

**humanbeing** · 03-23-2016, 07:33 AM

http://www.motorfans.com.cn/bbs/view...originator=yes
175 needs new crank...
Poor man higher c/r mod [Ultra-thin metal lower gasket (下垫) / no gasket (gasket maker ONLY)...] heard from some chinese forum