Wich 125-136cc cylinder to choose for 50 Special?

[roland87]

Hi there!
I have been reading the forum for a long time, but I am writing for the first time. 

I want to rebuild my 50 Special engine to more power, speed, fun etc.

I already have:
-50 Special original cases
-PHBH 28 carb with rotary intake manifold(and I want to stay with rotary intake if its possible)
-SIP/VAPE ignition
-Polini Banana exhaust(for the first time)

I think about next cylinders:
-Polini Mono 130cc www.sip-scootershop.com/en/product/racing-cylinder-polini-mono-130-cc_14000500
-Malossi MK4 136cc www.sip-scootershop.com/en/product/racing-cylinder-malossi-mk-iiii-136-cc_31176810
-VMC GS 125cc www.sip-scootershop.com/en/product/racing-cylinder-vmc-gs-125-cc-6-travasi_14002100

A bit overpricey but I think I can deal with it:
-VMC ET7 135cc www.sip-scootershop.com/en/product/racing-cylinder-vmc-et7-135-cc_14002000
-Parmakit ECV 125cc www.sip-scootershop.com/en/product/racing-cylinder-parmakit-ecv-125-cc_75044930
-Parmakit Touring ECV 130cc www.sip-scootershop.com/en/product/racing-cylinder-parmakit-touring-ecv-130-cc_75041920

So guys could you tell me please what is the best choice for me with my conditions?

[jonnysnatchsniffer]

the vmc et7 135 looks interesting, nice big transfers and exhaust with 2 sub ports, dont know much about them tho, it looks like
it would be the most powerfull depending on the port times
you would need a proper expansion pipe for it id say and thats not cheap, the exhaust studs are further apart by 10mm than single exhaust port
on the gsf it makes about 23-25ps which is metric hp so 21-22hp, it would put a smile on yr face for sure
bus as you only have the polini pipe this kit is no good for you
id use an alluminium kit if i were you so either the parmakits unless you go for the polini evo
you will need a large taper crank with whatever you chose so hope yr ignition is for the 20mm taper

[tzsteve]

nice looking as JSS says

thats also a 2 ring piston  which suggests its not a rev monster

but it looks like a bit of case work such as gasket face skimming might be needed

for what`s in the kit i would say the price is very good

i cant help wondering what postage, vat, etc add to the cost