Malossi 172 head gasket/spacer for T5

Schaltroller / Classic Motoscooters Vespa Largeframe
1

Hi,

I've finally ordered a Malossi 172 kit with the matching MMW head.

The kit comes with a head gasket (or spacer)… will I need to use it with this combination? As far as I understand, the MMW head squish is matched to the kit and adding a spacer would lower the compression unnecessarily.

Also, do I need to retard the timing more than the standard 16°? Fitting instructions say 14-16°, but I've heard that many leave as is.

BTW, I'll be running with a standard carb and Sito +.

I'm hoping someone has experience with a similar setup.

Thanks all…

2

I ended up fitting the kit + MMW head WITHOUT the supplied gasket (which is about 0.5mm) and measured the squish band – it was a fraction under 1.2mm, which is ideal.

I left the timing standard (stator lines up with the mark on the casing). This is meant to be 16 degrees, but when measured accurately ended up being between 14-15 degrees.

Still running in and despite rattling at low revs (which I believe is normal) it runs really sweet.

 

3

It's arrived now and looking at the squish area on the MMW head, it seems very shallow, so perhaps it does need the gasket? Or maybe the O ring included creates a bit of distance and gives the 1.2mm squish (as stated) without the gasket?

Apprehensive about fitting this until I know for sure… please help!!! [8-)]

Thanks

 

4

I have the same question....  Any help??? 

It´s necessary use the gasket ( that comes with malossi 172) in this cylinder head?

 

thanks