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The 2005 Piaggio Typhoon equipped with the 49cc Hi-Per 2 Engine is now completely unrestricted and performs significantly better than stock for nearly no money.
VA 17.5mm carburettor suitable for Piaggio Zip, Gilera Runner, SR50R etc Product Description Piaggio Typhoon 50cc 17.5mm PHVA Carburettor Years of Production 1999 - Present. Only suitable for the 2 stroke 50cc Air Cooled HI-PER-2 engined scooter 17.5mm PHVA Carburettor for Piaggio Scooters. Jetting: Main Jet - 65 Pilot Jet - 34 Needle Type - A12 Product Includes Electric Choke. Stickyparts Racing 17.5mm Carburettor Piaggio 2T engines The VA carburettor from Stickyparts features a 17.5mm internal diameter with polished aluminium slide and accepts an automatic choke. The fuel, vacuum and oil nipples are all in the original locations making fitment easy. The body of the carb is made completely from aluminium as is the float bowl making for a very strong hard wearing carburettor.
Although this carb can be used on pretty much all 2 stroke engines it is specifically designed for Piaggio 2T engined scooters. The inlet manifold union diameter is 23mm so the original inlet manifold can be used. The air filter union measures 34mm so it can be used on the standard air box or aftermarket pod filters such as the PedMoto 34mm. The main jet is a 6mm size 67 and idle jet is a size 38. The 17.5mm size is ideal for standard 50cc cylinders as well as tuned 50 - 70cc machines.
I have data for three two stroke zips. ZIP 50 MAIN JET 70 ZIP 50 CAT MAIN JET 56 ZIP 50 SP MAIN JET 75 the main jet is the large jet that is in the float chamber of the carb, it has a number on it. For example 70, you then buy a jetting kit that starts as close to 70 as possible, going upwards, the kit normally has 10 jets, so they will be something like 70, 72, 74, 76 and so forth.
Guess if it was me with that exhaust and your default jet was 70, I would try 76, put a new spark plug in and give it a run, take out the plug and observe the colour, if it is too high, or too rich the plug will be starting to look sooty/black, then if it was, I would try the 74. And keep going down in nunber until the plug had a light brown tan colour on the electrode. Get the right Jets for the carb/bike you have, as there is many different types and thread sizes. Someone on here might have a simular set-up to yours, and suggest a starting point.