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AWAKEN the POWER of your original 125 & 150cc cykinder. it can be optimized. u reach 177cc power! its called #Otuning :) :P 0:00 intro 0:09 cylkit pics 2:01 foot porting 3:16 exhaust porting 5:27 piston games 6:28 pic slide show 8:56 cylinder timings OTUNING STEPS 1) cylinder porting 2) exhaust port width & shape (=cyl timings) 3) piston opening MORE TUNING STEPS: 4) cyl head: sandpaper it down, to get more compresssion 5) intake timings extension: crank & case intake opening CYLINDER TIMINGS: Cyl: the usual tiny blow down needs to be extended. 27,28,29 recommemded Transfer port timings: 116-120 recommended, if lower u need to raise the cyl INTAKE TIMINGS a) the rotary valve tolerance needs to be 0,05mm! (crank VS case) b) then u can realize intake timings up to 200 degree open intake to the back If u set the timings right and use a proper exhaust port shape and width, there is no trial and error with port exit channel edges needed ;) i never touch it beside rounding sharp edges. this cylinder was a present for Yoke DanuPat in bangkok, enjoy! #vespa #otuning #FMPguides _________________________________________________________________ DISCLAIMER: the information shown in this video, is about THIS specific hardware. it is my personal observation documented with this video. It DOESNT automatically mean, that all such parts by this producer or seller do have or will have same issues. _________________________________________________________________ -------------------------------------------------------------------------- FOLLOW me on insta: @FreakMoPed fb: / freakmoped --------------------------------------------------------------------------