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Overview Reviews Similar Products --> Product Description Speed upgrade kit for your Tomos A55 LX, Arrow, Revival, Spint, ST, and Streetmate. Almost every Tomos A55 based moped will really benefit from this. Works great to de-restrict stock setup. Increased performance with after market exhaust. For use with original Tomos Dellorto PHVA carburetor. Jetting will be different when used with the 17.5mm upgrade. Includes new Main Jet, Infuser, Idle Jet, and Hi Flow air filter. Recommended Accessories : Jets for final tuning Product Videos Custom Field Product Reviews Write a Review Write a Review UNI Tomos A55 PHVA Carburetor Speed Upgrade Kit, Air Filter and Jets *Red Filter* Rating * Select Rating 1 star (worst) 2 stars 3 stars (average) 4 stars 5 stars (best) Name Email * Review Subject * Comments * 4 Reviews Hide Reviews Show Reviews 5 Pulls With Power Posted by Richard D on 11th Sep 2021 Upgrading my 2008 ST with this Air Intake Kit has made a big difference in acceleration and top speed. However, for heavier riders( I weigh around 250 lb.), the 22T sprocket is not recommended unless you are only looking for top end speed. After installing Air Kit, I switched to the 22T sprocket and found out that while my top speed did increase to 45-50mph, it was only after straining thru a poor low end crawl during which the moped sounded like it was having a hard time, that the bike eventually got up to speed and really took off while the exhaust became overly loud. After reinstalling the 24T spocket, my moped now runs like a dream. Engine has a smooth idle and the low end is steady as the moped accelerates from a stand still. At 30 mph the moped pulls with power as it opens up and climbs easily to 40-45 mph.