Month: January 2019

I have deliberated a fair bit about which primary ratio to go for but I think now I have a plan. As you all know it is a engine split job to change the larger primary gear so having some options for the smaller pinion is extremely handy. I decided to start with a 16/68 which gives a ratio of 4.25 to 1. DRT make a 15 and a 17 pinion giving me the availabilty of 4.53 and 4.00 to 1.

It is fairly hilly around here and I am seriously considering using a 3 speed gearbox so I have decided to go shorter than the 3.72 as fitted to the SS50 and the 50SR.

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Thanks to Shaun a parcel arrived today with a genuine head, a set of 16/68 primaries and a used genuine PK50XL crank that looks to have a dodgy big end but is in otherwise very good condition.

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Today’s Top Tip – 6mm clutch cable adjuster.

I recently got hold of a used clutch cable adjuster bracket for my build that was a lovely price but the thread was dodgy. As you know Piaggio decided 5mm was enough for this job – not sure that I agree with them to be honest.

Now you can put a nut either side of the bracket and it will work just fine but does make adjusting the clutch a little bit more of a fiddle than it needs to be.

The solution is simple enough. SiP do a 6mm adjuster for very sensible money – so the remains of the old thread can be drilled through carefully , cut a new thread using a 6mm tap , fit new adjuster , job done !

Now a second nut on the other side of the bracket is still a good idea to snug down once the adjustment is done to help take the load off the thread in the ’too thin for a thread’ bracket.

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Just been to collect my piston from Torbay Lambretta. Lovely little Meteor piston looks to be very good quality. Shown here with a 225 Lambretta piston and barrel to give you some idea just how tiny it is.

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Today I sorted out the head cowling. It needed a little trim here and there and a bit more of a trim to clear the reed manifold and to let the hot air get out more easily around the inlet manifold. One of the fan cowling holes didn’t line up and you can actually see a ghost of where another hole could be made, this would not have been right either so the existing hole was slotted – this will need a repair washer under the screw.

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