Pk50xl -tuning tip

[totle]

Hi


Looking to get as much as possible out of the engine, but at the same time have it reliable

Thinking pollini 133 cylinder ( if this is a good choise)

But need advice on carburetot, intake, exhaust, crankshaft etc to match

[jonnysnatchsniffer]

great choice if you use the evo version, franz pipe, 28-35mm pwk keihin carb, id not use a mazz crank tho unless you get it welded as ive had them twist a couple of times, and big end falure, small end too as some were made too tight, think eean of here has also had them bad, either way you will need a crank that has already the cutting needed for port duration increase.
then you will need a clutch, the bgm clutch woild suit aslo
then id fit a drt runner f1 tree, short 3rd and 4th
as for manifold polini do a good 30mm one for carb in the normal place
as far as keeping the rotary inlet, if you have a large pad case, aprox 42mm long then all is good, 38mm less so, if you have a shit case with a 25mm long inlet
like some pk 50 cases then you will need a reedvalve, you need to opn the pad up to around 1mm all around, i got away with .5
you will break thru the case so will need filling at the back of the inlet, the inlet should be straight walled from the manifold to the pad, no trumpetety or bellmouthy
this could make the difference of around 4hp or so
it all depends on yr budget of course