Sticky’s kit book Lambretta cowling modification | NEWS
As most of you have probably seen, Sticky is busy writing a book on Lambretta kits, he’s also put together a few videos to accompany the book and explain some technical bits and pieces in greater visual detail. This is the first of those videos and it’s aimed specifically at solving a problem of heat retention.
We are getting almost to the point where every Lambretta engine component weak link has been solved. Except one.”
As part of the forthcoming Complete Spanner’s Lambretta Kit Book I’ve been dyno testing and fitting tons of cylinder kits. In doing so I’ve encountered a few anomalies that I’ll be sharing as YouTube videos to accompany and promote the book.
Lambretta head cowlings are still very much in the dark ages because kit manufacturers rarely seem to consider how they affect the cooling of the kit. More than that, you need to understand how the cowling design works with the bodywork of the scooter.
Forward with Avanti
A big shout at this point should go to Ron Moss for being the first kit manufacturer to carefully look at the cooling system of the Lambretta barrel and head, and to see if it could be improved.
Ron’s Avanti kit maximised both the fin area of the cylinder and also the head design, and as such it required a dedicated oversized head cowling made from fibreglass.
After fitting Ron’s heads and finding that they dropped the temperatures of other kits, AF Rayspeed developed their own oversized Mammoth cylinder head which has even more fin area than the Avanti head. Rayspeed have subsequently produced a dedicated oversized head cowling in steel to suit it.
What about kits with ‘normal’ size heads?
It doesn’t take much investigation to discover that almost all of the reedvalve kits on the market compromise the airflow within a standard Lambretta cowling.
- Sometimes the blown air is allowed to escape through massive holes.
- Sometimes the air is obstructed from certain fins by the placement of the reedblock casting.
- Perhaps worst of all is that with some kits the design of a standard cowling actually prevents hot air from escaping.
Hack and slash
What the video covers is our adaptation of a Lambretta cowling to make it work correctly with a kit that features a head with radial cooling fins.
This is not a commercial project, just a home-brew solution by someone with all the welding skill of Joey Deacon performing a circus balancing act between high voltage pylons.
Forgive the workmanship, just concentrate on the why the modifications are needed.
VIDEO | Sticky's cowling modification
This is the first of a few videos that I’ve put together as both promotion and to illustrate some technical points for the forthcoming COMPLETE SPANNERS LAMBRETTA KIT BOOK.
The book is aimed at not only helping Lambretta owners find the right kit, but also making sure that they run as safely as possible.
In this episode we address an often-overlooked item – the cylinder head cowling – and how one might be modified to improve functionality with the latest breed of Lambretta cylinder kits.
This is not a commercial modification. It’s something my son and I knocked-up at home to solve a problem with the cooling system. I’m sure that in the future, commercial solutions to this problem will be available but for now, anyone who wants a cowling that works will have to modify their own.
If you make a tidy job of it and want to sell them then let us know.
I’m currently full steam ahead on the book but Covid-19 is not helping sort the last few chapters. With luck it’ll be printed in time for August Bank Holiday but if not then it will certainly be before the end of the year.
I’ll be publishing it together with Stuart Lanning of ScooterProducts.Com again under the Fingers In Pies imprint.
If you own a copy of the Complete Spanner’s Lambretta Manual and want more information on your performance options then look no further…
Reading material, available now from all good SLUK Shops