vespa POLINI 177 cast iron vs NEW aluminium / vespa px 125 TUNING classics / FMPguides

old cast iron 177 polini vs the new aluminium polini 177

changes:
exhaust port shape slightly different, upper edge is more straight (end of vid 4:21) = more area in the corners
boostport only 1 port instead of 3 (so the polini is now only a 5 port as marketing likes to count all the single channels of a cyl)
clearlly better ported at the bottom
removable steel exhaust nozzle that cant break anymore, but without viton o-ring for sealing
new proper head
possibilty of central spark.plug
unneeded optik tuning: 8 screws for the head.. looks cool and important, but absolutely not neeses, looks like.polini copied pinasco here

sad (so said as orange f..m.. would say):

1) very low cyl timings same low timings 166/108 as the old cast iron kit... why polini, why? why only exhaust port shape?


2) piston is a strenghtened copy of the old.one, the window still doesnt fit the transfer port why not a 100% state of the art piston?

3) weak power: cute 12hp for 400.- is not ok in 2017

pnp:
definitely.not the first choice for a 177ccm tuning cylinder kit, as it is in the oiwer range of thr DR177 = only 135.- (DR the BEST and cheapest pnp tunung kit for vespa 125, if u dont want more but just a little.bit more power)

further tuning:
also not.the best choice for tuning, cause to weak = crankshaft, adjusting ports at the case

FINE tuning:
nice kit to play with as u can grave ur wish timings, but its needed to set the kit higher and hortening on top

power:
only 11,5hp and 14,1nm pnp with si24 and sip road is not acceptable for 400.- as it is DR177 level (=135,-) other 177 tuning kits have 15-16hp. diagrams: search4 "germanscooterforum polini 177 aluminium" &go to page 3 for dynamometer diagrams with div5 different box exhausts, original and then ported 14,7hp with siproad --------------------------------------------------------------------------
FOLLOW me on
insta: @FreakMoPed
fb:   / freakmoped  

--------------------------------------------------------------------------