FOR RACE USE ONLY
The Norrie Kerr (NFK) exhaust was designed for race use on Norrie's 90SS race scooters, originally designed in 1983, its design and performance proved itself time and again with race wins and lap records too numerous to mention, its racing career lasted almost 20 years and have still being used to this day.
Norrie says "It was created from a desire to have the exact system I needed for my race engines. Dyno's were thin on the ground and a lot of homework was done, reading up on all types of tuners, and their approach. It was noted that in fact there was a true formulae to creating a two stroke expansion chamber, and from that formulae came the NFK system. A big sticking block was the confined area that the system fitted into, hence the tight 'lobster back' arrangement, to get the true full length of the system into the space, over the tyre, (both 350x10 and 300x10), and keeping it inside the side panel. The original systems were made in a thinner material and were prone to having small cracks appearing.
The new system uses 1.5mm thick metal to reduce such problems, The mounting had to be simple and direct, whilst absorbing vibrations, so rubber mountings were used. The muffler is now quieter, (not road legal) more efficient and re-packable." This exhaust will also fit with almost all 100cc to 135cc Vespa small frame models, most early models will require a little modification to the side panel brace, Primavera model require side panel toolbox removal, and a PK's will require you to modify the spare wheel mounting plate area.
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