WORB-5 head

[LI150]

With the malossi head I personally found the compression ratio too high at 12:1 so I switched to the mmw but if I was building one now I'd use the sip head

I have had all 3 head

My take on it is the malossi the compression seemed to high couldnt stop it pinking

The MMW compression was lower didnt pink but lost power

The sip head I would say the best part I ever bought for a Vespa

[Dryballs]

Yep what li150 said

My setup is malossi 210 with self reedvalved casing and keihen 30mm carb and sito exhaust

It's a really rapid and torquey motor

[ssteam177]

With the malossi head I personally found the compression ratio too high at 12:1 so I switched to the mmw but if I was building one now I'd use the sip head

Interesting: Is your's standard stroke? (12:1 is too high for me too!)

No it's 60mm stroke with the packing plate at the base of the cylinder( rd350 reed mmw2 reed block 30mm pwk carb 1650g flywheel 23hp)