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This 1500 RPM spring sits between stock and aggressive
2000 RPM Rating: The stiffest common tuning weight
It WILL NOT fit Small-Frame platforms such as the Vespa Primavera 50/150
You MUST up-jet your factory carburetor main jet (typically an increase of 10–15% in size) or pair this kit with an upgraded carburetor layout to prevent running dangerously lean and causing immediate structural heat seizure
Requires three screws (S 31027) and three washers (S16404)
Top Dead Center Tool (ART.4931) ramp This 1500 RPM spring sitsA very handy tool for finding top dead center on any scooter! Screws into the spark plug hole and stops the piston from travelling. Combined with a degree wheel, you can precisely locate top dead center and make your timing marks.
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