ET4 tuning question

New to this forum.  great frum

I have a 98' 125ccm ET4.  Looking to get more power out of it.

See that there is a 140ccm cylinder kit.

Is there any different porting in the 140ccm cylinder compared to original 125ccm cylinder?

Will I have more effect with this cylinder kit compared to boring original cylinder to 60mm (140ccm piston) ?

 

Any other modification that you recommend?

 

Ich bin aus Norwegen und kann ein bischen Deutch verstehen, aber ich bevorzuge Englisch