XR125- big bore

[EtienneNXR]

Can the xr125 engine be bored out, and have a bigger piston put in?
Any help would be apreciated

Thanks

[Daz Max]

i don't think there are any specific big bore kits for the XR
but this shows you how to build up a 200cc engine
Loads of good technical advice.

Vins Bike Page, formally '2strokes.html'

[EtienneNXR]

Thanks for the link

So it is possible to make the motor into a 200cc?

[Tilts]

What happened to the XR650 you where talking about...

[valiboi67]

NEW BIG-BORE kit 150 cc for Chinese 125cc CG125 copies on eBay, also Other Motorcycle Parts, Motorcycle Parts, Motorcycle Parts Accessories, Vehicle Parts Accessories (end time 08-Jul-09 13:39:51 BST)

i found this.....the xr has the same design as cg 125..quality of parts may not be as good looking at the price.....

as TILTS asked.....xr650?

[valiboi67]

just found this quote on another site

Please note the Chinese clone Honda CG125 overbore and big bore kits will not fit on genuine Honda CG125 engines.
I have emailed a few Honda CG owners who were disappointed when they bought their kits and did not fit.

The reason the Chinese CG150cc kit does not fit is the liner is OD 67.5mm (to big) and the Honda CG crank cases are only OD 64mm (to small).
So to be made to fit would take full engine strip and major machine work to crank case, and the danger of breaking into one of the oil ways.
Remember this work will not be cheap and not all Honda Cg125 crank case will be able to be machined bigger.
Honda changed the design of crank case over the years.

whether there are differences between the xr and cg that will make this possible i do not know..

Etienne if i find more info i will let you know k,if you have any luck let me know mate.......boyakasha

[EtienneNXR]

Cool Thanks guy- Any help is apreciated!

The XR... Licensing stuff didnt work out, long story short, have to wait another year before the big step up

[rebelrob]

hi all,

i have been told that for whatever reason there is not a big bore kit for xr125's. i have recently been enquiring after needing a top end rebuild and new piston and barrel in mine. there is a couple of places that say a cheap chinese cg125 equivalent engine one will fit, but many have said that it doesnt. so i have opted just to go for a full arrow s/s system for now. a k&n filter or somthing similar will be next, and maybe bigger carb jets. but they will have to wait for funding!

i would definately reccommend the full arrow system for any one with an xr125 if you can justify the money, as they sound amazing.

[Esoteric1]

These people do this kind of stuff, thye will be able to tell you if you call them, they re-houned a cylinder for me on an Aprilia rs 125. They also re-sleeve cylinders and provide you with the piston kits for the re-sleeve.

You will need to upjet the carb too.
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