125 reliable Race engine.

[SCW660]

Hi Guys I am wondering what your thoughts are for a 125 race engine, we want reliability and torque and hp , the moment the gearbox in my daughters current quad , smashed the selecter gear between 2nd and 3rd gear , she is racing Motor cross on her quad,
the engine is a yx 150 bottom end running a 125 kit purchased from the states a few years back. its a great powerful engine, but the gear box is weak and quality in the engine manufacturing is not there. we have rebuilt this one, but are now looking for a reliable race package.
any help would be great.

 

[my67xr]

i would look at the GPX125 , they are a very good engine

 

[SCW660]

we have one in my daughters dirt track quad , I agree an awesome powerful engine, but do they have much horsepower and Torque?

 

[my67xr]

they can pretty much keep up with a YX160
plus they are upgradeable too- http://www.miniriders.com/ask-the-tech-masters-/40689-jialing-125-upgrades.html#post465793

 

[SCW660]

hey thats nice to know, her current Dirt track quad is faster than a pretty well worked raptor 125 , with cam and head work done, the reason they went to the yx 150 was they wanted an engine with a starter motor as the previous owners son couldnt kick start the engine. So what are your thought on the bulid of the gpx engine from DHZ?

 

[zwebx]

gpx 125 ftw..
Tbh i would go a 155z over it anyday. For torque. there all very similar gearboxes throughout.
Stock they last well and repairing them is cheap as chips, just get another motor if you are worried so you can swap over in less than a hour.

 

[gottagetacheaperhobby]

Not to sure how it would fare im a quad, they are not a very torquey engine, they do have a hell load of power up top though. really have to thrash it to get the most from it. In saying that, they definately keep up with the 150s etc. I actaully think the 160 in my sons bike doesnt go as hard as it did with the gpx 125. Definately more torqkue, but the 160 cant match the top end of the gpx.

 

[Cordogs]

155z FTW bud, whack a flat slide carb on and decent ignition and you've got yourself an awesome little torque monster! :thumbup:

 

[SCW660]

the trouble is she is In the 125 comp class (modified) other wise the 155z for sure

 

[Cordogs]

Oh true?

Yeah mate the gpx all the way then!

 

[motovert24]

gpx125 with an oko26 on dhz is the best engine ive had.
wears out clutchs pretty quick though